How to make homemade motors for a boat. Do-it-yourself homemade outboard electric motor. How to assemble such an engine yourself

At one time I was fond of fishing from a boat. And therefore I decided to make an outboard electric motor for fishing using the trolling method (from a moving craft equipped with a motor, usually a spinning rod for a lure).

How to make a homemade electric boat motor

I considered it inappropriate to make the unit detachable to allow replacement or repair of the engine, since the service life of the motor is quite long, and its operation is not so intensive. Therefore, I don’t think that replacing the electric motor will ever be necessary (at least it hasn’t been necessary in five years). And if necessary, you can quickly make the entire assembly again.

Every fisherman has thought about replacing a shop motor for a boat with an alternative engine. They learned how to create it from lawn mowers, gas trimmers and even screwdrivers, since their cost is several times lower than the price of a ready-made model. The most suitable option is a trimmer, since this device is equipped with all the necessary elements and mechanisms.

Benefits of using a trimmer

Using a trimmer to create a boat motor has a number of advantages:

• much cheaper than a ready-made boat motor;
• minimal fuel consumption;
• light weight;
• reliability;
• tightness of the structure;
• availability of ready-made elements for control;
• built-in tank, etc.

Thanks to these qualities, the trimmer ranks first among other options available for remodeling.

Features of a homemade engine

When converting an engine, it is worth considering that they were developed to perform different functions. The trimmer operates at high speeds and low torque, but the outboard motor must do the opposite. Therefore, remaking the device requires special tools and even a drawing.

It is more convenient and simpler to build an engine from a trimmer, since it has a number of necessary components:

1. very economical engine;
2. built-in unpainted fuel tank, allowing you to easily control the amount of fuel;
3. the presence of a starter and gas in the device;
4. a rod equipped with a rigid shaft.

All that remains is to buy the missing parts or make them yourself and you can start making an engine for the boat.

The trimmer operates at high speeds and low torque, and the outboard motor must do the opposite

What can be done

There are several possible options for modifying the trimmer for a boat motor.

Option #1. A very simple method, but requires additional financial costs.

You will need to purchase the following parts:

1. Clamp for fastening the device to the transom of the boat.
2. Propeller screw. You can purchase a ready-made set online, since stores may not have a similar product. The package includes a special drive made of stainless steel, as well as universal adapters for the flexible trimmer shaft, which allows you not to bother with whether they will fit your model of lawn mower or not.

Advice! Sometimes the kit may include a clamp, so before buying it, check what is included in the kit.

The mounting drawing for the trimmer is indicated in the instructions. Installation will take about half an hour.

Option #2. For the conversion you will need an angular gearbox from a grinder, a screw that can be cut from a stainless steel sheet, as well as oil seals and bearings for fastening. This method allows you to achieve maximum speed, despite the small pitch of the screw. In the field, the device requires additional adjustment, which is performed using pliers.

Option #3. This method is done as much as possible with your own hands. Let's look at it in more detail using the example of a lawn mower with a 25 cm 3 two-stroke engine. The device weighs 4.5 kg and has a power of 700 W and is equipped with a curved leg. A trimmer with such power allows the boat to move at a speed of approximately 5-7 km/h.

For the conversion you will need an angular gearbox from an angle grinder, a screw that can be cut from a stainless steel sheet, as well as oil seals and bearings for fastening

What you need

For manufacturing you will need materials and tools:

1. Trimmer.
2. Duralumin with a thickness of 2 mm. It is necessary for the screw.
3. A clamp or any other device for securing the device to the boat.
4. Welding machine.
5. Fastening elements.
6. Additional tools for work.

All the necessary elements can be purchased or made yourself. The drawing may be needed to develop a homemade propeller, but not for the drive. The dimensions of the propeller directly depend on the drive power, as well as on the weight of the craft. For example, a propeller with dimensions of 10x3 cm is capable of moving vehicles weighing about 120 kg.

Manufacturing instructions

To make a boat engine from a regular trimmer, you will need to perform the following steps:

To break in a homemade engine, you will need a tank of gasoline (0.5 liters) with oil in a ratio of 1:40. One tank of fuel allows you to cover about 10 km of territory. The speed of a boat with such a motor is in the range of 5.6 – 7.9 km/h, depending on the load of the boat.

1. It is much easier to convert a trimmer with a straight shaft. If the rod is bent, it will need to be completely replaced, since the steel cable will not be able to transmit the required torque. To change a curved shaft, you will need to use a duralumin tube, press a bronze bushing into it and mount it in an appropriately fitted holder.
2. The screw should be created according to the drawing from duralumin. If necessary, its dimensions can always be adjusted.
3. The screw should be installed in place of the trimmer head. Be sure to make a ring attachment to protect the cylinders.
4. You can order ready-made kits on the Internet and save time on creating the elements yourself. The kit includes all the necessary adapters for the shaft and drive, sometimes even a clamp is included in the kit.
5. You can control the device using the starter handle, but very often it is inconvenient to use. It can be easily replaced with a regular bicycle derailleur.
6. A clamp is used to secure the engine, and the fastener itself is made on the boat transom.

Boat motors are very popular today. If we consider the medium power model, it is very compact and is designed for approximately 5 horsepower. In design, most modifications are quite different. This is primarily due to the different types of deadwoods. Additionally, it should be taken into account that the device parameters are affected by the connector used. You can make an electric boat motor yourself, but you should familiarize yourself with its structure in more detail.

The device of a conventional motor

An integral part of any outboard motor is the tiller. It is used to control the device. The upper block of the model contains a flywheel, which is connected to the crankshaft. As a result, the rotational motion is transmitted from it to the screws. In the lower block of the outboard motor there is a small head with bearings. In the middle part there is a deadwood, which includes many elements. If we consider a simple modification, then this is a pan, gearbox, and also a rod. There is a connector located next to the motor in the device. Its main task is to control the operation of the fuel system.

Features of Min Kota motors

Making a Minn Kota electric boat motor yourself is quite difficult. Their electric motors are most often two-stroke. They are designed for a maximum power of about 3 kW. In this case, flywheels are used on both sides. They are made for models only from aluminum alloy. In order to install them, a small camshaft is used. A wide variety of fuel pumps are used for outboard motors. Their deadwoods are most often produced with pallets.

Watersnake models

Assembling Watersnake electric boat motors yourself is very difficult. First of all, this is due to the fact that their carburetors are used with special clamps. It’s difficult to get them in the store, but it’s possible. It should also be taken into account that steel pallets are used in all configurations. In order to secure them to the rotor, you need to use a rod. The pushers are attached to the outboard motor on the deadwood.

At this stage, you should calculate in advance the size of the rocker arm in which the valves are located. Lastly, it is important to deal with the lower head with bearings. Due to the durable propellers, these electric boat motors have good reviews. In this case, they can be removed from the broken model. Clamps are rarely used in devices, but they are ideal for homemade configurations. You can sharpen them at home using a machine. In order to secure the clamp to the pallet, it is necessary to disassemble the starter box. After this, it is important to disconnect it, and then the upper block will not interfere.

HDX models

You can make an HDX electric boat motor using a single-stroke engine. Additionally, assembly will require a crankshaft, which must be installed above the deadwood. In this case, it is best to use a steel pallet. You should also pay attention to the intake and exhaust valves. They are installed in the outboard motor near the fuel system.

A small metal plate can be used as a reverse lock. It can be fixed to the body by welding. Additionally, a central rod must be installed in the deadwood. You can take it from an already broken boat motor. The last thing you should do is the bottom block of the device. Due to the high-quality rotors, these outboard electric motors deserve good reviews.

Devices with double-sided handwheel

Let's move on to a more complex model. Making a boat electric motor equipped with a double-sided flywheel with your own hands (the drawings are shown below) is quite difficult. First you need to select the appropriate engine. In this case, it is more advisable to give preference to two-stroke modifications. Their cooling system is usually air.

To install the flywheel into the device, you will need to use welding. In particular, it is necessary to make a support above the camshaft. After this, the flywheel can be mounted on its wall.

The next step is to assemble the deadwood. For this purpose, it is best to use a large diameter rod, since the load on it will be large. Additionally, you should select a separate tray for the outboard motor.

Lastly, the lower block is connected, which consists of a head and screws.

Models with two-stroke engines

To assemble a boat electric motor with a two-stroke engine with your own hands (the drawings are shown below), you need to prepare all the tools in advance. In particular, you will have to use a welding machine. It is impossible to install a deadwood on an electric boat motor on your own, so the help of two people is required. Many people use sanding machines to sand the pallet. In turn, the rod can be cut for the model using a grinder. You will also need files to fit the valve. In this situation, it is best to select a compact size rocker arm.

All this is necessary in order not to pinch the fuel system channels. Pushers for outboard motors are selected separately. Flywheels for a two-stroke engine are most often installed as conventional ones. Connectors in such models are used quite rarely. Additionally, it should be taken into account that the easiest way to remove the head is from an already broken outboard motor. The same goes for screws. If the assembly does not include the installation of a gear unit, then it is better not to install the tilt lock in the lower block of the structure.

Devices with four-stroke engines

It is quite difficult to assemble an electric boat motor with a four-stroke engine with your own hands. First of all, you need to choose a good case for the model. Next, you need to prepare a clamp for it. With its help, a boat electric motor can be installed. Impellers for models are used in a variety of shapes. First, the deadwood for the engine is folded.

At the next stage, to assemble an electric boat motor with your own hands, you should secure the rod. This will allow the crankshaft to rotate above the sump. In order to install the drive gear into the head, the anti-quitting plate must be moved to the side in advance. Only after this the anode will not block the outlet. In this case, the propeller is attached last.

Modifications on recoil starter

Boat motors of this type are quite widespread. Single-stroke engine configurations are most suitable for them. In order to install it, you should prepare the housing as standard. You can easily take it from an outdated model. After this, it is important to assemble the upper block, which includes the motor and rotor. Only after this can you move on to deadwood. The manual starter is directly mounted above the sump.

In order to fix it in the body, you will need to use a welding machine. After this, it is possible to connect the rod to the crankshaft. If it is large in size, it can be shortened using a grinder. Also, problems during assembly may include the lack of a suitable flywheel.

In this case, it is necessary first of all to evaluate the size of the rocker arm. After this, it is important to take the existing model and simply grind it down to the desired size. However, the edges of the flywheel should ultimately be very smooth.

A wide variety of fuel systems are installed on an electric boat motor. The most common are two-valve modifications. They are inexpensive on the market and extremely easy to install.

Model with protected gearbox

Boat motors with protected gearboxes are quite common today. They should be collected from the top block. First of all, the fuel system and gearbox are installed. After this, it is possible to mount the electric motor. In order not to block the valves in the system, the flywheel should be selected in a compact size. The last thing you need to pay attention to is the lower impeller. It is connected to the plate by welding. Only after this are the propellers secured.

In order to assemble a boat motor yourself, you need to understand its structure. Additionally, it should be taken into account that a tiller will be required to control the model. In this case, it is more advisable to use parts from an old outboard motor. Engine trays are selected separately. You should also pay special attention to the fuel system. Some experts are able to assemble a boat motor from a chainsaw or trimmer.

Simple motor design

At the top of any outboard motor is the engine itself. It is connected to the piston system through the fuel pump. Additionally, it should be noted that the outboard motor has a special rocker arm. It is necessary in order to ensure the operation of the valves. In this case, a lot depends on the engine cubic capacity. There is a clamp on the pallet in the outboard motor. With its help, it is possible to secure the model on board.

The latches above the pallet are not always used. In some cases, gearboxes are also installed. Today there are a wide variety of deadwoods. Directly below them is the crankshaft, which is connected to the central rod. Thus, the torque is transmitted to the lower gear. The screws rotate through a special head.

Chainsaw model

A boat motor can be made from a chainsaw, but parts from an outdated model are required. First of all, the engine of the device is removed. It is installed directly on the pallet. At the same time, you can choose the most common fuel system for it. In this case, the limiting frequency parameter will not exceed 1300 rpm. The rocker arms for these boats are suitable with three valves. However, special attention must be paid to the type of convector.

With this part you can control the tiller. After securing the top plate, it is possible to move on to the deadwood. In this case, it is better to choose a durable one. In this case, the central rod must be borrowed from an old outboard motor. At the end of the work, you only need to install the lower gear with screws. To pump out water, you will additionally need a pump.

Motor from trimmer

The motors from the trimmer are quite easy to assemble. First of all, experts advise removing the handle. It must be replaced with a rod. Next, it is important to make a sump for the engine. In this case, you can even use a cast iron stove. The engine must be mounted on it very carefully. You can use a regular fuel pump for the system. However, it is more advisable to select a durable camshaft, otherwise it will not withstand heavy loads. In this case, the deadwood is attached only after the upper gear is fixed.

If desired, you can install a thermostat on boat motors (homemade). The clamp is mounted after securing the deadwood. To prevent the engine gearbox from dangling, many experts advise using a special rubber gasket. The screws of the model must be secured to the vertical shaft.

Model from a walk-behind tractor

It is quite difficult to assemble homemade boat motors from a walk-behind tractor, but it is possible. If we consider electrical modifications, then first of all the starter is removed from the device. Additionally, the motor must be disconnected. If a four-stroke modification is used, then the most common fuel system will do. In this case, it is important to select a high-quality water pump. In turn, the deadwood can be taken from an outdated outboard motor. To secure the fuel pump, many people use various clamps. The easiest way is considered to be placing it above the carburetor. At the same time, it should not come into contact with the rocker arm.

The crankshaft on outboard motors (homemade) must be mounted above the top gear. At this stage, you need to check the strength of the clamp. The pallet, in turn, should not overlap it. The water pump in this case is installed under the deadwood. In order not to interfere with the operation of the lower rod, many experts advise using special springs. After they are secured, all that remains is to secure the screws and tiller.

Devices with double-sided handwheel

Making a boat motor with a double-sided flywheel with your own hands is not an easy task. In this case, it is more advisable to choose a two-stroke engine. In this case, the rocker arm under it must be designed for three valves. It is also necessary to check the strength of the pushers before installation. They must withstand a maximum pressure of at least 3 bar. In this case, you can hope for stable engine operation. In this case, the pallet must be mounted under the clamp. For convenience, you can fasten it with screws and then use sealant. After securing the tiller, the sternwood is connected. The outboard motor propeller protection is installed last.

Models with two-stroke engines

You can do it yourself with a two-stroke one only if you use a crankshaft with a diameter of at least 60 mm. Otherwise, it will not withstand the load. In this case, you can select a regular flywheel. In this case, the fuel pump must withstand a maximum pressure of at least 3 bar. Experts advise installing rocker arms only on three valves. The thermostat can be mounted on boat motors (homemade) if desired.

Exhaust valves in the system are most often installed in aluminum. There are a variety of cooling devices available today. The simplest option is considered to be a water modification. To do this, intakes should be provided in advance in the pallet. The pushrods above the engine should be installed last. The deadwood for the two-stroke modification is suitable with a 120 mm rod.

Devices with four-stroke engines

It is possible to assemble a homemade outboard motor with a four-stroke engine, but you will have to use parts from another model. In particular, it is necessary to select a clamp for the device separately. You should also pay attention to the fact that in this case a rocker arm will be required for four valves. In this case, the tank is installed under the fuel system near the pan.

Deadwoods for an engine are usually selected with two rods. In this case, the crankshaft must be selected separately. Connectors in such devices are installed quite often. The tiller must be attached directly to the flywheel. It is best to use steel clamps for this. In this case, it is quite difficult to do without welding.

Modifications on recoil starter

Homemade boat motors (swamp boats) with manual starters are quite common. These components are installed near the camshaft. In order to secure them, you must use a rubber gasket. In this case, there must be at least four screws. If we consider four-stroke engines, then starters are usually installed electronically. However, for two-stroke modifications, manual devices are ideal.

Model with protected gearbox

Boat motors with protected gearboxes are quite in demand today. In order to assemble them yourself, you need to select a motor with a power of at least 3 kW. The starter in this case is of the manual type. First of all, a clamp for the engine is cut out. Only after this can you begin to install the fuel system. If desired, the thermostat can be installed on the rocker arm.

The next step is to attach the gearbox. To prevent the rocker from twitching during operation, you can place a gasket under it. The pushers are installed on the pallet, and for this you will need to use a welding machine. In this case, it is important to fasten the upper rod under the clamp. To prevent pressure from deforming the pallet, many experts advise installing additional supports.

Devices with anti-cavitation plate

Boat motors are controlled quite comfortably using an anti-cavitation plate. In this case, it is necessary to begin work on assembling the device by securing the engine. Only after this are the clamps welded. You can use screws to secure the fuel pump. In this case, it is not necessary to install a gasket. Special attention should be paid to the fuel system. It should be mounted next to the water piston. The anti-cavitation plate is fixed near the connector. However, it should not come into contact with the pallet. In the end, all that remains is to install the deadwood.

Motor with gearbox

Boat motors with gearboxes are quite difficult to assemble. In this case, it is necessary to select a high-quality connector. In turn, the engine can be used four-stroke. The pushers for the system are installed quite wide. The gearbox should be mounted at the top flange. In order to avoid short circuits, all wiring must be carefully hidden. Additionally, you should take care of a good water pump. To block the upper rod from the carburetor, you can use sealant.

Model with reverse lock

In order to assemble a motor with a reverse lock, you first need to mount the motor as standard. After this, the tiller is connected to the plate. The fuel system can only be installed after the rocker arm. To avoid pinching the carburetor, many advise using gaskets.

The reverse lock should be attached directly under the clamp. For this purpose it is necessary to use a welding machine. After this, all that remains is to secure the deadwood. If the outboard motor is installed with a gearbox, then the lock can be placed directly in it. However, this is quite difficult to do due to the fact that you will have to saw the block body.

More and more anglers are thinking about installing a motor on a boat. It allows you to speed up movement across a pond and relieve your hands from hard work with oars. When a man’s physical strength becomes less, ingenuity comes to the rescue. It turns out that you can make a boat motor with your own hands from various household appliances. For those reservoirs where the use of gasoline engines is prohibited, electric current is used as the driving force. In other cases, it is better to choose devices with gasoline power units.

What are homemade boat motors made from?

Many fishermen have faulty electrical or gas equipment in their storage room or garage. If the motor in it is working properly, then such a device can be modified to fit an existing boat. In some cases, it is even cheaper to purchase a new screwdriver or brush cutter and modify the device than to buy a boat motor. It is the financial issue that pushes numerous “left-handed” and “home-made” people towards unique developments.

1. To make a homemade electric boat motor, you will need a cordless drill or screwdriver. In this case, the fisherman will have to solve the following problems.
   • Unfortunately, the capacity of the standard battery will not be enough for carefree sailing, so you will have to take a 12V car battery on board. Accordingly, the device must also operate at the same voltage. As for power, an electrical device that produces more than 300 W can handle a light rubber boat.
   • The rotation speed of the screwdriver is quite high, so it is necessary to install a reduction gear.
   • You also need to purchase or make your own drive shaft and propeller.

A homemade electric boat motor will operate silently, which is very important for good fishing. In addition, replacing a failed electric motor will be cheaper than repairing a boat engine.

1. Gasoline engines made for a boat with your own hands can significantly increase the fishing area. These can be power units from chainsaws, lawn mowers, walk-behind tractors, etc. The choice of installation depends on the size and design of the vessel, as well as which of the devices is available.
   • Trimmers require the least modifications. They look like they were made to be installed on a fishing boat. It is enough just to install a propeller instead of a reel with fishing line and the boat motor from the trimmer can be tested on a nearby body of water.
   • Engines from a chainsaw, motorcycle or walk-behind tractor will require more intervention by skilled hands. Requires a bevel gear from an angle grinder, a shaft and a propeller.

This is interesting!

Some fishermen minimally modify the motor cultivator by installing homemade blades instead of cutters.

All homemade boat motors require a special device for attaching to the side of the boat. It's one thing when the boat has a transom to which you need to attach the engine. It is somewhat more difficult to secure the power unit on a regular elastic band with inflatable sides around the perimeter.

Making an engine from a screwdriver

Good homemade motors for boats are made using cordless screwdrivers. It is optimal to use a device with a battery voltage of 12V. It will be possible to connect a car battery with a capacity of 45-55 Ah to such an electric motor. Refinement will consist of several stages.

Lifting mechanism

The propeller of an electric motor for a boat made by yourself must move not only in a horizontal plane, but have a certain immersion limit and rise completely out of the water. The simplest design would be a system of clamps to which the engine is mounted. It is rigidly attached to the transom using a steel frame and plate. The clamps are equipped with rings through which the tube will pass. There will be a shaft made of steel wire or rod running inside. To ensure easy sliding, bearings of suitable dimensions are pressed inside the tube.

Gearbox and propeller

The screwdriver is capable of developing high speeds, which is required when drilling. A homemade electric motor for a boat does not need such high speeds, so a gearbox is installed to reduce them. The most suitable option is to attach a gearbox from an angle grinder. In the screwdriver chuck, it is enough to clamp the top part of the shaft to ensure a reliable connection.

The role of a propeller can be played by an impeller from a car pump or a computer cooler. But such a home-made electric motor will not be able to provide the boat with the required speed. You can make a propeller from a piece of stainless steel 2.5-3.0 mm thick.

1. First you need to cut out a square blank measuring 30x30 cm.
2. A square with a side length of 5 cm is marked in the center. Diagonal lines are drawn through the corners. The cut will go through them to a small square.
3. Each petal should be rounded and rotated along its axis by 30 degrees.
4. A hole is made in the central part for attachment to the gearbox.
5. All that remains is to reliably connect everything and test the resulting boat electric motor with your own hands.

Refinement of lawn mowers

The boat motor from the trimmer requires a little modification to get a workhorse for the watercraft. The advantage of gasoline trimmers is their low price and maintainability. Homemade motors for boats based on gas trimmers have a built-in tank, shaft and gearbox. You can look for a special conversion kit, which will contain a stainless steel propeller and drive, as well as a set of adapters for the trimmer shaft. Often there are kits with a clamp for installation on the transom, so there will be no problems with fastening to the boat. If you follow the included instructions, you can convert a boat motor from a lawn mower in 20-30 minutes.

More skills will be required from the angler if he decides to radically change the design of the trimmer. In this case, there is huge scope for imagination and ingenuity. One option involves making a vertical leg.

1. To rotate the shaft 90 degrees relative to the engine, you will need a gearbox from an angle grinder.
2. The existing trimmer tube must be shortened using a cutting machine. It is better to replace the bushings inside with bearings.

To fix the bearings inside the tube, it is necessary to make a careful crimping with a hammer around the circumference.

During testing, necessary adjustments can be made. At low speeds, the blade is trimmed or the propeller pitch changes.

fishelovka.com

DIY boat electric motor -

According to the code of laws of King Hammurabi, time spent fishing is not included in the calculation of life time. Perhaps the ancient kings were right, but today it is not always possible to catch fish from one place.

But what if the use of gasoline engines is prohibited on a reservoir? Or when you are limited in time, and it is not possible to transport a motor boat, and you have to use a rubber boat?

As a rule, in such cases, a boat electric motor is purchased as part of the equipment.

Such motors for light and small boats are very useful because:

• electric motors do not use gasoline and oil, they have no exhaust gases;
• the electric drive is lightweight, compact, and does not take up much space;
• using an electric drive is more economical than a gasoline unit;
• As a rule, modern electric motors are designed using fundamentally different technologies and therefore, with small dimensions and energy consumption, provide maximum traction force with modest energy consumption.

But all these advantages apply to the case if the electric motor is available, but what to do when it is not?

Electric motor from a drill

As a way out of the situation, many reinforcers use a motor from a cordless drill or screwdriver. In fact, for both industrial propulsion and home-assembled ones, the main source of propulsion is the electric motor.

The layout of such a motor is the same for all models:

• power source – battery;
• engine – electric motor;
• working body – propeller with gearbox;
• control unit - in this case, the direction of movement is controlled by turning the handle, and the speed is regulated by decreasing or increasing engine speed.

In fact, a screwdriver or drill has all this. However, it should be taken into account that most electric boat motors have a propeller mounted directly on the electric motor. This entire structure has a sealed housing and is immersed in water.

But the drill does not have a sealed housing and therefore the layout of a boat motor with a gasoline engine, which is located at the top, is more acceptable for it.

Advantages of an electric motor from a drill

When considering an electric motor from a drill as a motor, you need to understand that the motor itself is of great value, but with a speed control unit, in other words, a button, its value increases several times.

But still, there are several clear advantages in choosing a drill or screwdriver:

• the cost of such a tool is several orders of magnitude lower than the cost of a factory outboard motor;
• legislation strictly monitors the use of motors on water bodies, while the power and type of engines, both permitted and prohibited for use on certain water bodies, are clearly regulated;
• the drill is battery-powered, and in addition to using a standard power source, it is possible to use other sources that are compatible in terms of parameters;
• The cordless drill, as a tool, operates almost silently, which is important for fishing enthusiasts;
• A drill, like any other tool, can be repaired if necessary; fortunately, there is a large selection of spare parts and parts for repair on the market today.

Required power

When determining the power of a drill for a boat motor, it is necessary to take into account that the design of the drill provides for its operation in an alternating cycle.

When the greatest load is carried out for a short time, as a boat motor the engine will work for a very long time, and at the same time experience very noticeable loads, which means it is necessary to choose a drill with a power reserve.

The most suitable for this option are models of power tools equipped with motors with a power of 150 watts and above.

This technical solution is associated with a power reserve when operating a unit with a propeller with a diameter of 130-150 mm, and designed to move a boat with a load of up to 300 kg, and 300 kg will be considered the maximum load for the motor.

Operating voltage

When starting to implement a project with a drill, probably the main point will be to select the appropriate unit for the operating voltage. Among the tool options presented today, the main ones are drills with voltages of 12, 14.5, 16, 18 and 24 volts.

The question of choosing the right one here is that, like branded motors, drill motors will be powered by batteries. A standard battery included in a tool kit can, in principle, ensure uninterrupted operation of the drill for some time, but even modern lithium and cadmium batteries have a capacity that will clearly not be enough for normal trips.

Therefore, the only way out will be to use an additional source, and the most suitable would be a car battery.

Standard car batteries, even with a capacity of 45 amps, will perfectly ensure the operation of the drill, which means that the most acceptable option for a boat electric motor would be a 12 volt drill.

Required tools and materials

Since there are no two identical twin motors, given the experience of building similar motors, you will most likely need:

• drill - as a motor;
• clamps - the motor will be attached to them, if there are no suitable factory ones, you can make homemade ones;
• gearbox – most often the gearbox is used from an angle grinder when the motor is planned to be placed directly at the transom of the boat;
• tubes, diameter 20 mm and square tubes 20x20 mm - for the rod and directly attaching the drill;
• metal rod - for the motor shaft;
• sheet metal for propeller.

During manufacturing you will need the following tools:

• metal scissors:
• welding machine, although there are ideas to fasten the structure with rivets, but the welding connection will be much more reliable and faster;
• the same drill, with a set of drills;
• grinder, sharpening and cutting wheels;
• in the case of using wooden parts in the construction, then nails and screws.

Lifting mechanism for impeller

The use of a lifting mechanism in the motor allows not only to control the movement of the boat, but also, if necessary, to raise the propeller above the surface of the water. Ideally, such a device should provide rotation of the screw in both horizontal and vertical planes.

The simplest and at the same time the most effective design could look like this: a motor is attached to the transom of the boat using clamps. The clamps are rigidly attached to a plate or square, and have rings into which a tube is threaded with a guide welded to the middle perpendicular to the axis, into which the motor shaft is threaded.

This hinged solution is quite simple and does not require additional, complex solutions.

1. More sensitive gear. Reviews and instructions for other types of gear can be found on the pages of my website.

Gearbox installation and propeller manufacturing

Despite the fact that a drill is a tool designed for drilling holes, that is, to overcome the resistance of another material, using a drill as a boat motor has its own characteristics, and this, first of all, is that during operation the propeller will be constantly in the water, and, This means that high drill speeds are not needed at all.

To reduce the number of revolutions, gearboxes are used. Most often, two gearboxes are installed - the upper gearbox reduces the number of revolutions of the drill from 1340 to 250-300.

Such revolutions are enough for the boat to move confidently. And the lower gearbox is installed to install the propeller perpendicular to the shaft axis.

If you use a gearbox from an angle grinder, then the upper end of the shaft is simply clamped into the drill chuck.

The manufacture of a propeller or impeller begins with marking a sheet of metal.

A square of 300x300 mm and a thickness of 2.5-3 mm is quite suitable for making a screw. However, any impeller can be suitable for a propeller, for example, from a car cooling system or a household exhaust fan, but in order for it to be a real propeller, you will still have to make an impeller.

A hole is drilled in the middle of the sheet to fit onto the gearbox bolt. Slots are made along the diagonals, not reaching the middle of the sheet 25-30 mm, the resulting blades are given a rounded appearance and the weight is adjusted - the blades must be identical and not create beating or vibrations. The blades are slightly rotated to create the required flow.

Improvements to turns and controls

Like any design solution, the motor design will need to be improved, and the finished motor will require certain skills, so you will have to go through a short training course.

For testing the sample, any container with water into which the propeller can be immersed will do. After turning on the device, a directed stream of water should be felt from the immersed screw. To achieve the greatest effect, the propeller is modified.

The motor control is modified depending on the wishes of the owner; most often the power button is moved to an external handle, providing an increase in the turning arm. At the same time, you need to get used to controlling the engine by adjusting the engine speed.

How to correctly calculate the loads and what should happen?

When making calculations, it is necessary to build on the following data:

• weight of the boat in running order;
• engine power consumption;
• current strength;
• voltage.

When designing a motor, it would be useful to use an electrical measuring device to measure the voltage under load and during idling.

If the declared engine power corresponds to the power consumption calculated by the formula:

If power consumption = 12v * current under load, then we can confidently say that the electric motor is selected correctly.

It is possible to influence the engine power by choosing the right propeller impeller; in any case, a well-chosen impeller will significantly reduce engine heating.

Application of windshield washer motor

In the design of boat motors, electric motors from cars are often used, for example, motors from a windshield wiper or radiator. Such electric motors have a standard 12 volt, and are ideal for use with a car battery.

The windshield washer motor is largely suitable for designing a boat motor. It is small, it can be used with a car battery, but requires additional modification.

Motor based on a gas mower

Design ideas do not stand still, and a completely normal solution is to try to use a lawn mower engine as a motor. Unpretentious 6 hp engines designed for long-term operation in various situations. completely allows for the creation of a boat motor using structural elements of boat motors of the Soviet period.

Motor from the Ural-2 chainsaw

Until now, many craftsmen use internal combustion engines from Soviet chainsaws. It’s not worth talking about the quality and reliability of such engines, since many units had too different production and operating conditions.

Some were made in bulk before the quarterly bonus, others for defense orders, but the engines that have survived to this day have one common problem. Today there is a real question about the production of motor gasoline and motor oil used for them. At the same time, boat motors assembled on the basis of motors from the Ural-2 chainsaw are reliable and unpretentious in everyday life.

Electric motor application

A separate interesting application for boat motors is the topic of using conventional electric motors as engines.

Modern technologies, in principle, allow the use of 36 and 127 volt DC motors as motors.

Sometimes there are thoughts about using other 220-volt engines on small boats.

One of the obstacles to the implementation of such projects is the need for power supplies and inverter converters, which produce 220 volts of alternating current from 12 volts of battery voltage.

And 220 volt alternating current on a small boat sooner or later ends in tragedy.

The most promising from a construction point of view is the constructive solution of using a gasoline engine from a lawn mower or trimmer. Its big advantage is a ready-made solution that does not require modification of the upper gearbox, engine power supply system and control.

Almost all the parts are already ready for use; it is simply necessary, when using such a motor with a rubber boat, to improve the mounting design and use the appropriate length and carrying capacity of the boat.

Conclusion

Having considered all possible options for using engines with different purposes, assessing their positive aspects and problematic aspects, it is necessary to supplement the set of laws of the ancient Assyrian kings, which does not count the time spent in creative searches.

After all, the possibility of using an engine from a trimmer or windshield washer as a boat motor is within the capabilities of only those who are in love with creativity and who want to realize their dream.

fastcarp.ru

Making a motor for a boat with your own hands

Unlike ancient times, when you could only hope for a fair wind to appear by relying on the forces of nature, today you can move along the surface of the water in any direction without significant physical effort and in complete calm.

Thanks to scientists who obtained electricity for humanity and tamed the fire of the internal combustion engine, any boatman can independently attach some kind of motor to his watercraft.

What can a boat motor be made from?

A boat motor can be made from many mechanisms that gather dust in a barn or garage and are not used for their intended purpose.

It often happens that equipment breaks down, and to repair it you need to spend more than half the cost of a new device. In this case, it is much easier to purchase a new device, put the old one aside and use it as a source of spare parts and various bolts and nuts. It is from such devices that a boat motor can be made.

If such devices are not available, then you can inexpensively purchase such a mechanism on the secondary market. The main thing is that in such devices the engine is working properly.

Boat motor from trimmer

By minimally changing the trimmer design, you can create an excellent traction unit for a boat of any design. Such a device already has an engine and transmission; it is enough to make a mount for the boat, and instead of a reel with fishing line or a disk, install a propeller.

Before making a boat motor from a trimmer, you should understand that the power of such devices is very low, and it is unlikely that you will be able to move against a strong current.

The trimmer as a boat motor is ideal for use on a lake or pond.

The disadvantages of using this device include the high noise level. In addition, at a low speed of movement you will have to breathe absolutely all the products of the “life activity” of this system.

Boat motor from a screwdriver

Electric-powered boat motors have excellent performance in terms of noise production and environmental friendliness. You can make a motor for a boat from a screwdriver, but the power of the device should not be less than 300 W. To transmit torque to the propeller, which is located underwater, you can use a flexible shaft from a trimmer.

A small aluminum propeller from a car fan is used as a propeller, and to ensure long operating time of such a device, car batteries with a capacity of 60 A/h are used.

The disadvantages of such designs are the need to carry a fully charged car battery with you. The mass of such a part is more than 20 kg. The disadvantages include the limited stroke of such a motor; after the battery is discharged, it will be necessary to manually set the boat in motion again.

Boat motor from a walk-behind tractor

The most powerful of the homemade boat motors is considered to be a device made from a walk-behind tractor. Equipment for processing personal plots is equipped with durable and durable four-stroke internal combustion engines, which, when installed on the craft,

will allow him to develop decent speed both with and against the current. Such engines have a significant mass and are usually not used on PVC boats.

The easiest way to install a boat motor of this design involves minimal modifications to the main structure. It is enough to attach a walk-behind tractor to the hull of the boat and install aluminum blades instead of cutters. The blades must be located in the same plane with the shaft, which in this case is located perpendicular to the movement of the craft. The blades have the form of rectangular plates, the lower half of which must be lowered into the water, and the upper part must move freely through the air. This paddle wheel device will allow you to move at high speed even in places where the depth does not exceed half a meter. A boat engine made from a walk-behind tractor with a fast current does an excellent job.

Other options

You can make a homemade engine not only using trimmers and screwdrivers as a basis. If you want to design a boat motor yourself and have a significant supply of time and money, then any technical device equipped with an internal combustion engine or driven by an electric motor can be used as a power unit.

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Many craftsmen install motorcycle engines on their boats. In this case, it is possible to regulate the propeller speed by shifting the gearbox. Powerful 12-volt motors, which are used in various mechanisms, can be successfully used as boat engines.

Making a boat motor with your own hands

Making a boat motor is not at all difficult - it is enough to prepare all the necessary parts and assemble the device in such a way as to eliminate the possibility of damage to the boat when operating such a unit, and to ensure safety for people.

The simplest option for making a homemade motor from a trimmer. For assembly you will need the following materials and tools:

1. Trimmer.
2. Spanners.
3. Pliers.
4. Screwdriver.
5. Grinder or hacksaw for metal.
6. Drill and twist drills for metal.
7. Hairpin 12 mm.
8. Vise.

To make a working version of the outboard motor, you will need to purchase a trimmer. You can use any model, but the more powerful the device, the higher the speed characteristics of the boat.

Making a propeller is the first thing to start with. For the screw, a duralumin plate measuring 100 - 30 mm is used. Exactly in the middle of such a plate it is necessary to make a hole to install it on the trimmer shaft. The diameter of the hole depends on the thickness of the gearbox shaft and is usually 17 mm. Before bending the duralumin plate, it must be annealed. Then each side is slightly bent with pliers so that when such a plate rotates axially, its pitch is no more than 10 mm.

Then the reel is removed from the mower and a screw is installed in its place. It is necessary to tighten the nut well so that the screw does not turn during operation. The trimmer discs are secured with a nut with a left-hand thread, so when operating the outboard motor you do not have to worry about losing the screw due to the nut being unscrewed.

Then you need to make reliable fastenings with which the trimmer will be installed on the boat. On the trimmer body at the junction of the two halves there is a ring for attaching a belt. It is this part that will connect the trimmer body to the boat. It is necessary to make a mount that will reliably connect the boat hull with the trimmer “eye”. For this purpose, you can use a mechanical meat grinder, in which the lower part is separated using a grinder or a hacksaw. Then a hole with a diameter of 12 mm is made in the body of the resulting clamp. The hole must be located in the transverse plane of the screw clamp.

From a metal pin with a diameter of 12 mm, you need to cut a piece 100 mm long. On one side, this section of the pin is slightly flattened and a hole with a diameter of 6 mm is made in it. A 6 mm bolt is threaded into this hole, onto which the trimmer “ear” is installed. The bolt must be tightened with a self-locking nut.

The process of installing a motor on a boat occurs in the following sequence:

• the mount is installed on the transom and securely fixed using a threaded connection;
• a homemade boat motor is installed in the mounting hole.

The engine can be started and controlled by holding the outboard engine body level, and, if necessary, tilting it in the opposite direction of the boat's turn.

Gearbox and its influence on operation

The use of a gearbox for a boat motor allows you to change the direction of axial rotation. The gearbox changes the shaft rotation speed several times, which has a positive effect on the operating life of the engine. When equipping a gearbox with a boat motor, you should stick to the golden mean and not install a device with a large gear ratio. Failure to comply with this rule leads to excessive fuel consumption, low boat speed and engine overheating. The most reliable way to install a gearbox with the optimal gear ratio for a given engine is to test several different devices. If during operation there is no feeling of excessive load, which manifests itself in the impossibility of quickly accelerating to high speeds and the speed of the craft is quite high, then this gear ratio can be considered optimal for a given engine.

An average gear ratio that will work well with many internal combustion engines used as a boat motor is 1/5.

Electric motors can be used as propulsion for boats without a gearbox. The traction force of such devices is sufficient to operate stably in the mode of direct transmission of torque to the propeller. An excellent engineering solution is to use an electric motor underwater. With this arrangement, the screw is fixed directly to the motor shaft.

Homemade motor with gearbox

It is not easy to make a motor with a gearbox yourself, but this design will allow you to change the speed of the boat and change the traction characteristics of the propeller. This design is convenient when fishing by trolling; in addition, switching to a lower gear will allow the craft to move more efficiently against strong winds and under significant load.

The most compact engine option that you can make yourself is a device that uses a two-stroke engine from a Karpaty moped as the power unit. Such a device will have only two speeds, but this is quite enough.

The engine is installed on a self-made frame, which is a cut-off part of a moped frame. The right cover and the drive sprocket are removed, and a small gearbox is attached to the shaft, to which a standard “leg” from the Whirlwind outboard motor is then attached, through which torque is transmitted. All parts must be installed in such a way that the structure is as balanced as possible, otherwise a noticeable imbalance will be felt when moving, and when using such an engine with a PVC boat, the craft may capsize. The control handle of such a device must be at least 0.5 in length, otherwise while operating the boat you can get burns from the hot engine and muffler elbow.

The advantages of such a boat motor are very quiet operation, low fuel consumption and the ability to switch to a lower gear when necessary.

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firstfisher.ru

DIY boat electric motor

At one time, when King Hammurami still lived, he argued that the time spent fishing is not included in the calculation of the total life time. This is also confirmed by many citizens who like to spend part of their free time fishing.

Typically, most anglers own a boat. Many boats, especially modern ones, are equipped with gasoline engines. And a boat without a motor, especially if you have to fish in the waters of a large lake, becomes a burden that requires enormous costs, effort and energy to move. And here you definitely need a motor: gasoline or electric - it doesn’t matter.

Still, special attention should be paid to the electric motor because:

• electric ones do not require either oil or gasoline to operate, which means there are no exhaust gases, which does not harm the environment;
• electric motors are smaller in size, lighter in weight and do not take up much space. This is especially true if you have to fish far away, and every kilogram of excess weight is always felt;
• they are much more economically profitable than their gasoline counterparts;
• modern designs are assembled using modern parts developed using modern technologies, therefore they have maximum power with minimal weight.

But these statements only apply if the boat owner already has an electric motor and has experienced such benefits to the fullest. But what to do if it is not there? This means you need to do it yourself.

Electric motor from a drill

Many enterprising boat owners use a drill or screwdriver that runs on batteries, since the industrial design of the electric motor is based on the same principle. The basic layout of such a unit is almost the same for all models and looks like this:

• the battery is the power source;
• the electric motor acts as a boat engine;
• a propeller with a gearbox is a working tool that allows the boat to move through the water;
• control unit - consists of a knob for turning the direction of movement and changing the speed of rotation of the electric motor.

Almost all elements can be found in an electric drill or screwdriver. In this case, one should take into account the fact that industrial devices are hermetically sealed, which allows the main components to be in the water.

If you use an electric drill, it is advisable that it be located away from water. This is the only problem, quite serious, that requires a technical solution. The slightest splash of water on the control unit can damage it, which will lead to the boat stopping.

Advantages of such a model

If you take an electric drill, you should always remember that its main value is the engine and the speed control unit (button). Choosing a drill or screwdriver has some advantages compared to buying an industrial outboard motor:

• In terms of price, this purchase will be much cheaper than purchasing a factory model;
• according to the law, it is necessary to adhere to the requirements related to the power of engines used on various bodies of water;
• the electric drill is powered by a battery or other power sources with suitable parameters;
• The electric drill is easy to repair, thanks to the availability of a sufficient number of spare parts on the market.

Power selection

When choosing a drill, you should take into account the fact that it is mainly designed for operation in cyclic mode. If the drill is installed on a boat, then you need to count more on a continuous cycle of work. This means that you need a reserve of power, otherwise the drill will overheat.

In such cases, you should opt for a power of 150 W or more. The power reserve will allow you to work with a propeller with a diameter of 130-150 mm. In addition, you need to take into account that the total weight of the boat will be 300 kg, no more. We can assume that this is the maximum weight.

Selection of operating voltage

You should immediately pay attention to the fact that drills and screwdrivers are available in different operating voltages, such as 12 V, 14.5 V, 16 V, 18 V and 24 volts. Batteries are also produced for the same voltage. And yet, the capacity of standard batteries that operate an electric drill or screwdriver under classic operating conditions is not enough to ensure the necessary movement of the boat on the water. In this regard, it is better to pay attention to a car battery, which has a much larger capacity. And since a car battery produces 12 V under load, a drill should be selected with an operating voltage of 12 V.

Naturally, you can make a battery from a set of manufactured batteries for power tools for any voltage, but this can be much more expensive.

Required tools and materials

For such a device you will need the following parts:

• electric drill for motor;
• clamps for mounting the motor (drill). Both ready-made factory and handicraft ones are suitable;
• the gearbox from the grinder is suitable if the motor is installed on the transom of the boat;
• round tubes with a diameter of 20 mm and profiled tubes 20x20 mm. A rod and a mount for the motor (drill) will be made from them;
• a round rod of metal from which the motor shaft will be made, as well as sheet metal for the propeller.

The following tools may be needed for work:

• metal scissors;
• welding machine, although you can do without it;
• electric drill and set of drills;
• grinder with cutting and grinding wheels;
• if the structure includes wood, then nails or screws (as well as wood).

Lifting mechanism for impeller

The presence of a lifting mechanism radically simplifies the operation and maintenance of the entire system, especially since there are cases when it is urgently necessary to lift the propeller. As a rule, such a mechanism controls the position of the electric motor in all planes (vertical and horizontal).

As an option, we can propose the following design of such a mechanism: the motor is attached to the transom of the boat using clamps, which are rigidly fixed to the plate. The clamps are equipped with rings through which the tube is threaded, and the motor shaft is threaded through the axle welded in the center of the tube. This results in a very simple articulated joint that can provide normal motor control.

Fastening the gearbox and manufacturing the propeller

As far as we know, the drill is designed for drilling holes and has a high final speed, which is not acceptable for supporting the operation of a propeller, which operates at slower speeds. Therefore, in order to reduce the speed transmitted to the propeller, the installation of a gearbox is required. Sometimes you need 2 of them, depending on design solutions. The upper gearbox should reduce the drill speed from 1500 to 200-300 revolutions, which will ensure normal boat movement.

The lower gearbox is used for horizontal installation of the propeller. When using a gearbox from an angle grinder, it is simply clamped in the drill chuck.

The manufacture of a propeller propeller begins by marking it on a piece of steel sheet. As mentioned above, its diameter should be no more than 130-150 mm. You can take a square of metal, 200x200 mm in size and 2.5-3.0 mm thick. It would be better if it was stainless steel, although it is much more difficult to process. As a last resort, you can use the impeller from an air exhaust fan or car cooling system. At the same time, it should be taken into account that the impeller profile is designed to work with an air mass. In this regard, you will have to start making it yourself.

A hole is drilled in the center of the square for the landing screw. Slots are made along the diagonals so that the sheet remains intact in the center up to 25-30 mm. After this, they begin to form the shape of the blades. Typically, they have a rounded appearance. In this case, you need to ensure that the blades are the same size, otherwise there will be vibrations. After this, the blades are slightly turned to a certain angle. In this case, the direction of rotation of the blade must be taken into account.

Testing the structure before installation on the boat

Since manufacturing takes place at home and, as they say, in order not to break off in the water, tests should be carried out. Any container of water that will fit the propeller will be suitable for this. Naturally, the larger the capacity, the better. As a last resort, if possible, it is recommended to go out into nature, to a river or pond and test it in action without installing it on a boat.

When the engine is running, a directed stream of water should be observed and felt. In addition, no serious vibrations should be felt. If the propeller is not operating at full power, you can modify it by increasing the angle of the blades.

The motor control system is modified depending on the wishes of the boat owner. The main thing is that it is convenient to manage. It is better to move the engine speed control button to a convenient place.

Correct calculations of the load on an electric drill

The following components should be included in the calculations:

• weight of the boat when fully equipped;
• power consumption of the electric motor;
• current and operating voltage.

During the assembly process, you should take an electrical measuring device and make sure that the engine power matches the load power. The engine power must exceed the load power. It is desirable that the engine power overlaps the load power by at least 20%.

If the engine power matches the power consumed by the electric drill: if the power consumption, calculated by the formula P = 12V x Ipot, corresponds to the declared power of the engine (electric drill), then we can say that everything is done correctly and the electric drill can be used as a motor for a boat. At the same time, we should not forget about the 20% power reserve. It will definitely be needed in case of emergency situations.

During the setup process, it is better to experiment with the impeller to select the correct blade configuration. As a rule, their shape significantly affects the economics of engine operation.

Using the windshield washer motor

Some owners who decide to make their own electric motor for a boat use various 12V engines that are used on board the car.

Such engines are perfect for such functions, if only because they are designed to run on a car battery. Despite this, they require some improvement.

Motor based on a gas mower

Boat owners are constantly experimenting and finding amazing solutions. The high cost of industrial designs forces them to do this. As a result, the idea of ​​installing a lawn mower motor on a boat was born. These are engines with a power of about 6 hp, which are designed for long-term operation under load in various conditions. Such an engine can be adapted to a boat if you use various spare parts intended for repairing Soviet boat engines.

Motor from the Ural-2 chainsaw

Some craftsmen easily adapted motors from Soviet chainsaws as motors for boats. At one time, a huge number of chainsaws were produced, the quality of which needs to be discussed separately. Despite this, some motors installed on boats still serve today. The main thing is to calculate everything correctly.

Electric motor application

This is a very interesting question. The use of conventional AC motors has been discussed for a long time. Such motors do not have a brush mechanism, so they are very easy to operate and operate.

But there are some factors that have to be taken into account. The first factor is the presence of an alternating voltage of 220 V. Alternatively, it is possible to install an inverter that can convert a direct voltage of 12 V into an alternating voltage of 220 V.

The second component is safety, because 220 V voltage is very dangerous for humans, especially on water. This requires special measures. But if there is water all around, it is difficult to even imagine what exactly these measures should consist of.

Homemade boat motor from a trimmer

There is an almost ready-made option - this is the use of a motor from a trimmer or from a brush cutter. Almost everything is ready here, all that remains is to decide on the length of the device and install the propeller. There is no need for an upper gearbox and no need to modify the control system or engine power supply system.

The main task is to properly secure such a device on the boat. This is especially true if you have an inflatable boat.

Conclusion

The production of such structures is available only to those boat owners who are in constant creative search. On the other hand, most of the boats are owned by anglers who are constantly experimenting. Therefore, it will not be difficult for them to realize their ideas.

Naturally, creative people or people whose family budget does not allow them to purchase both a boat and a motor for it are engaged in the independent production of various designs. Therefore, some fishermen still use oars and do not regret it. They are only satisfied with the fact that they have a boat, since there is another category of fishermen who do not have such a boat. They enjoy fishing from the shore and envy those fishermen who have a boat, although without a motor.