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 present to your attention the design that emerged as a result of this decision. It is based on the engine from the VAZ-2121 interior heater stove. Actually, a regular 12-volt car battery is used to power the electric motor. The electric motor was placed inside a “cocoon” created from polyurethane foam, which is given the required streamlined shape by trimming the excess. Then the entire knot is covered with gauze on epoxy glue EAF in five to six layers. Only the power wires and the motor shaft are routed outside.I considered it inappropriate to make the unit detachable so that the engine can be replaced or repaired, 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.
The screw shaft is sealed as follows: the neck of a plastic Coca-Cola bottle is cut off, a felt seal is glued into it, through which the screw shaft is passed. The neck is glued “tightly” into the motor housing, the felt is soaked in a suitable lubricant (I used car engine oil) and clamped by screwing on the cap from the same bottle, with a hole drilled in the center for the propeller shaft.
The outboard motor deadwood is made of aluminum pipe, inside which only power wires pass. At the upper end of the pipe there is a power switch, a clamp for attaching the motor to the transom of the boat and a control handle (tiller). The power wires are attached to the battery with quick-release alligator clips. The propeller is homemade, four-bladed, made of ABS plastic. Its diameter is 220 mm. The propeller is balanced using the two-blade method (more information about this can be found in the relevant literature). Balancing allows for a fairly large error, since the engine speed, like the mass of the propeller, is not large. Around the propeller I made a ring nozzle from a strip - to protect it from winding up aquatic vegetation and to allow the boat to be controlled without a rudder.
During testing, the traction force of the electric motor was about 3 kg, which is quite enough to ensure the movement of a small fishing boat. Subsequently, I plan to install a variable resistor into the motor power supply circuit to control the propeller speed and, accordingly, the speed of movement.
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. First of all, this is due to different types 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 controls the device. The upper block of the model contains a flywheel, which is connected to the crankshaft. As a result, the rotational motion is transferred 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 in the device next to the motor. 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 electric boat 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. It is best to use a rod for this large diameter, 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 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. For sanding a pallet, many people use grinding machines. 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 by the most various 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's picked big size, then 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.
Evgeniy Bronov
Reading time: 5 minutes
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How to make a boat motor yourself?
With a limited budget and golden hands, you can not only do it yourself, but also the engine for it. There are several mechanisms that are not used for their original purpose, from which a good design can be obtained. This article will present options for obtaining a homemade outboard motor and manufacturing instructions.
Often costs more than the vessel itself. But it's not just the cost of the structure. On some bodies of water you cannot drive with gasoline engines. In addition, the electric motor has a number of advantages over its fuel-powered counterparts.
- No hassle of buying gasoline, changing oil and hassle with exhaust fumes.
- Light weight and dimensions compared to many factory units.
- Significant savings in the use of electric drives.
- It is possible to create a device capable of good traction with low power consumption.
And homemade outboard motor It will also be a more reliable device, since the owner will know every screw inside. If you have some mechanisms lying around in the garage that are no longer suitable for their intended purpose, you can use the following.
- Drill or screwdriver.
- Trimmer.
- Walk-behind tractor.
Any product with an internal combustion engine is suitable as a basis.
In most houses and apartments you can find an old drill or screwdriver. Even in their new form, they are more affordable than an industrial motor. If they run on batteries and have a button to control the speed, then the principle of operation with an electric motor is similar.
- Availability of battery as a power source.
- A propeller with a gearbox sets the craft in motion.
- The engine controls are a reverse button and a rotation speed control knob.
Most factory-made boat products are sealed, and therefore can be used in water. This fact is excluded when choosing a drill or screwdriver as a homemade boat motor, because they are not sealed.
But it is worth remembering that moisture penetration into the controls of an electric drill is fraught with trouble. The engine will stall and the ship will stop. The advantage is that it is very easy to find spare parts for the drill.
Another significant point is that it is not intended to operate continuously. This is not very suitable for boat engines. Therefore, it is advisable to create a power reserve to avoid overheating of the homemade product.
- You need to start from one hundred and fifty watts and more.
- In this case, it is realistic to choose a propeller with a diameter of one hundred and thirty millimeters.
- The total weight of the vessel is no more than three hundred kilograms.
The voltage of drills and screwdrivers can be different, as well as their batteries. But the capacity of the latter is not enough to control the boat. Then it will do car battery, which produces twelve volts. It is better to choose a drill with a similar voltage.
Of course, a battery of batteries for any voltage will save the situation. But the cost of such a device can be expensive.
To make homemade motors for boats from a drill, you need to assemble a set of accessories and tools:
If you need to quickly remove the propeller, it is advisable to do lifting mechanism for controlling the motor in vertical and horizontal positions.
To create the mechanism, you need to equip the clamps with rings and pass a tube through them. This articulated device ensures the reliability of the steering wheel.
Gearbox and propeller
The rotation speed of the drill is slightly higher than that required to operate the propeller. The gearbox will adjust the difference.
- The upper gearbox is capable of reducing speed from one and a half thousand to three hundred. In this situation homemade motor will allow the boat to move smoothly.
- The lower gearbox is important for horizontal positioning of the propeller. If it is taken from an angle grinder, just clamp it in the screwdriver chuck.
To make a propeller, you need to select certain sections on a steel sheet. A square of two hundred by two hundred millimeters and a thickness of three is enough. Stainless steel is much more difficult to cut, but it is preferable and lasts longer. You can also use a blade from a household exhaust fan.
You need to make holes in the center of the sheet. They are necessary for the landing screw. The slits are made diagonally, leaving a circle of thirty millimeters in the center.
The blades should be round and equal. Each one must be rotated at a certain angle and direction of rotation so that there is no vibration of the screw.
A test “swim” is done in any container with water that will fit the propeller. You can go to a small pond and lower the propeller into the water without a boat. Such a test will show whether the made motor is ready for swimming.
Right assembled electric motor will return a stream of water, but without vibration. If something goes wrong, a design made on , can always be improved with the help of a larger angle of inclination of the blades.
Before you make a motor for a boat, you need to understand how it will move with its help. It is important to take into account the weight of the vessel with all things, engine power, current strength and operating voltage. Motor power for rubber boat or PVC must be at least twenty percent greater than the load capacity. This advantage useful in case of force majeure.
It is advisable to measure the voltage under load and during idling using a special device.
An excellent homemade boat motor can be made from a trimmer. Such an electric motor is made simply because of the similarity of the devices.
There is no need to take anything away from a trimmer or a walk-behind mower or greatly alter it. In particular, the top gearbox remains the same, as does the engine power supply and control system.
The option is considered very profitable and convenient, because the device contains a transmission and an engine. All that remains is to make a mount for the watercraft, remove the area with the disk and install the propeller. But let's not forget about the shortcomings.
- It is worth remembering that the motor for a boat from a trimmer has low power. It is difficult for such a device to swim against the current.
- A trimmer boat motor is ideal for moving on small bodies of water with standing water. And this is not always the ultimate dream of active recreation lovers.
- You will have to get used to the strong noise effect and smoke.
In general, such a homemade outboard motor is not a very cheap option due to the cost of the motor mower. But if it already exists and defects have appeared in it, it can easily be converted into an engine for the most different models floating craft. It is suitable for small boats; a plywood boat can withstand it due to its lightweight design, and an inflatable one too.
Homemade boat motor from a walk-behind tractor
If the previous option is considered low-power, then the device from a walk-behind tractor is the opposite. Equipment for working with land, as a rule, has reliable four-stroke internal combustion engines. This DIY boat motor is capable of carrying passengers even against the current at an impressive speed.
True, a decent volume does not allow installing such structures on PVC boats. At least on small ones. The principle of how to make a boat motor from a walk-behind tractor is as follows.
- Together with the cutters, aluminum blades are placed in the same plane with the shaft.
- The blades must be perpendicular to the movement of the vessel. These appear to be rectangular plates, half hidden under water. The rest moves freely through the air.
- The device is attached to the hull of the craft and allows it to move easily even in shallow waters and bodies of water with rapid currents.
Possible homemade products for a PVC boat with your own hands
A homemade boat motor can be built from a ventilation engine or a stove from a passenger car. Either take Automobile compressor"Dwarf".
However, there are a number of disadvantages for such models.
- The first option is immersed on a shaft. But at the same time, the tightness is broken. We have to think about how to solve this problem quickly.
- The compressor is considered more powerful and is installed vertically on top. In this case, it is connected to the screw through an angular gearbox and a shaft.
It is possible to work with these structures if you have technical experience. Otherwise, it is better to contact a mechanic.
For example, someone who uses motor boats made without any help from plywood is able to cope with the modification of a walk-behind tractor.
With all the variety of outboard motors, do-it-yourself PVC for a vessel are acceptable options. Based on reviews, it can be judged that the duration of their operation does not differ from factory ones with proper modification and assembly.
It is worth remembering that before using it on deep water, you need to test the manufactured outboard motor with your own hands. This can be done at least near the shore of a reservoir. In any case, the experience gained will always help when faced with surprises in the operation of electric motors.
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 attention Special attention 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 needed. 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 cast iron stove. The engine must be mounted on it very carefully. A regular fuel pump can be used 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 model's screws 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 most in a simple way It is generally accepted to place 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 most simple option It 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 hand-held devices fit perfectly.
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 is suitable in this case 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, 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.
Every fisherman has thought about replacing a shop motor for a boat with an alternative engine. They learned to create it from lawn mowers, gas trimmers and even screwdrivers, since their cost is several times lower than the price already finished sample. Most suitable option– 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, reworking 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:
- very economical engine;
- built-in unpainted fuel tank, allowing you to easily control the amount of fuel;
- the presence of a starter and gas in the device;
- 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 modifications to the trimmer for the motor of a swimming craft.
Option #1. A very simple method, but requires additional financial costs.
You will need to purchase the following parts:
- Clamp for fastening the device to the transom of the boat.
- 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:
- Trimmer.
- Duralumin with a thickness of 2 mm. It is necessary for the screw.
- A clamp or any other device for securing the device to the boat.
- Welding machine.
- Fastening elements.
- 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:
For break-in homemade engine You will need a tank of gasoline (0.5 l) 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.
- 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.
- The screw should be created according to the drawing from duralumin. If necessary, its dimensions can always be adjusted.
- The screw should be installed in place of the trimmer head. Be sure to make a ring attachment to protect the cylinders.
- 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.
- 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.
- A clamp is used to secure the engine, and the fastener itself is made on the boat transom.