Homemade boat motor. 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.

And yet, special attention should be given 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 excess weight always felt;
they are much more economically profitable than their gasoline counterparts;
modern designs are assembled using modern parts developed according to modern technologies, therefore, with minimal weight they have maximum power.

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.

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 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 buying 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.

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, it must be taken into account that total weight boats will correspond to 300 kg, no more. We can assume that this is the maximum weight.

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 similar 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).

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.

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 an air impeller 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. As a rule, 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.

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.

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 motor 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. You will definitely need it 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.

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 of different 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 application special measures. But if there is water all around, it is difficult to even imagine what exactly these measures should consist of.

There is practically ready-made option– this is the use of a motor from a trimmer or from a lawn mower. 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 similar device properly secured to the boat. This is especially true if there is 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.

It is natural that self-production various designs are engaged creative people or people whose family budget does not allow them to purchase both a boat and a motor for it. 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.

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. 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, and 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:

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 you do

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:

Clamp for fastening the device to the transom of the boat.
Propeller. 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 remodeling you will need bevel gear 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 necessary elements You can buy or make it yourself. The drawing may be needed for development homemade screw, 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 has a bent shape, it will need to be completely changed, 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 regular switch speeds from the bike.
A clamp is used to secure the engine, and the fastener itself is made on the boat transom.

The need to convert a regular boat into a motor boat can arise for various reasons. But here’s how to do this if the budget is limited and there is not enough money to buy a ready-made motor. There are many options that help you make a fully functional boat motor from scrap materials available in every home.

Motor made using a trimmer

Before you start making a homemade motor for a boat, you need to decide on the choice of base from which the engine and other parts important for assembly will be taken. In this case, a trimmer will be used. In addition to this option, there are many more that use everything, even an ordinary screwdriver.

However, the lawn mower wins in many respects, and the design of its engine is closest to the design of a purchased outboard motor. This is proven by the drawings that many craftsmen compared before choosing what to take as the basis for a homemade boat engine. And so let's look at:

An engine that will save a huge amount of fuel (as the lawn mower is used frequently). Moreover, it can be four-stroke, just like on conventional motorboats. However, this happens very rarely and it is mostly two-stroke
All manual gasoline mowers use a plastic and translucent tank, which allows you to constantly monitor the amount of fuel in it.
The internal part of the design makes it possible to easily convert it to a boat motor without much strain

The main difficulty when converting a trimmer is that the mower's engine will not always be able to cope with movement through water. This is due primarily to different technologies operation of each engine.

On a gasoline mower it has large number rpm due to low torque. For a boat, the exact opposite is needed. However, this is easily fixed. But for this you definitely need tools (everyone has them) and drawings.

Basic list of tools required for work:

The trimmer itself is the basis of the future boat engine. Since most often a homemade motor is made for a rubber boat, having a small weight and size, the power of the trimmer can be small - about 0.8 kW. Even such a small power can provide an average human speed of 5-7 km per hour. However, if the motor is made for a heavier and more massive boat, you should choose mowers with higher power
A material that is ideal for making a screw (this can be done at home), most often it is duralumin with a thickness of about 2 mm
A vice or any other tool that allows you to secure objects (in this case, a motor to a boat)
Metal welding machine (any, but preferably semi-automatic)

Manufacturing process

Creating a boat engine based on the above materials can proceed in different ways. Either all the main components that must be present are purchased, or they are made on their own (not difficult) using scrap materials

Calculations must be made, based on which a drawing of the screw must then be drawn up. It is made based on many parameters, the main ones being the size and weight of the boat.

It is easier and better to make a motor if you choose a lawn mower model that has a straight shaft. Otherwise, it will take a lot of effort and expense to convert a curved barbell into a straight one.

If the screw is made by hand based on calculations and drawings, then the edges must be sharpened well (almost to acute angle). The propeller blades are usually made curved by approximately 10 mm. Since the material used is the same duralumin, it is possible, in the case of bad work screw, bend it safely, since the material is very elastic.

The screw is placed in place of the trimmer head, which is removed when disassembling the mower. It is imperative to use a nozzle in the form of a ring, since it is possible that the blades at high speeds can damage or even tear the material of the boat (if it is rubber). Adapters that allow you to connect the main motor shaft to the propeller can be purchased on the Internet. They are very cheap.

A rope starter can also be used from a lawn mower. However, if they are uncomfortable to start, you can use a speed starter from an old bicycle. After all the assembly, it is enough to secure the resulting structure onto the boat itself with a clamp.

Quick assembly of a boat motor using a chainsaw

Using a chainsaw engine to make a boat motor is very effective solution. First, at the stage of disassembling it, you need to remove the tire and the pump that supplies oil to the chain, the lever that allows you to regulate the speed and the gas tank (not suitable due to the design of the motor).

Using PCB material, it is necessary to make a mounting point for the main part of the engine, in which the starter and the entire clutch mechanism will be located, to another part of the engine (this design will make the engine operate more efficiently).

At the very bottom part For the entire structure, it is necessary to insert a steel bushing using a press, which will be attached to the deadwood. The deadwood will be made from an inflatable boat oar (cheap), which is made of duralumin. The clutch responsible for the clutch must be connected through a special shaft to the gearbox.

The gearbox can be made from component parts grinder. It is filled with oil used to lubricate the car transmission. The structure is still fastened with a clamp or a vice. The steering wheel that performs maneuvers can be made from a duralumin pipe (the remaining part of the oar).

The speed bar from the bicycle can protrude behind the gas handle, as in the case of a trimmer. The propeller, as the main part of the motor, can be made in the same way as in the case of a trimmer, using duralumin. At the same time, the calculations carried out to determine the size of the screw remain the same.

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 limited in time, and transport motor boat there is no opportunity, and you have to take advantage 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 supply– 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 on the market today large selection spare parts and parts for repair.

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 solutions is associated with the 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.

Question the right choice The point here is that, like branded motors, drill motors will be powered by batteries. A standard battery included in the tool kit can, in principle, ensure uninterrupted operation of the drill for some time, but even modern lithium and cadmium batteries They 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 mounted on 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 a 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 case of use in construction wooden parts 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.

How to catch more fish?

I have been active fishing for quite some time and have found many ways to improve the bite. And here are the most effective:

. Attracts fish in cold and warm water with the help of pheromones included in the composition and stimulates her appetite. It’s a pity that Rosprirodnadzor wants to impose a ban on its sale.
More sensitive gear. Reviews and instructions for other types of gear can be found on the pages of my website.
Lures using pheromones.

You can get the rest of the secrets of successful fishing for free by reading my other materials on the site.

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 a 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 of 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 carrying out 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. entirely allows for the creation of a boat motor using structural elements 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, because they are too different conditions Many units had production and operation problems.

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 the real question is about the production of motor gasoline used for them and motor oil. 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

Separate interesting application For boat motors, the topic is using conventional electric motors as engines.

Modern technologies, in principle, make it possible to use engines DC for 36 and 127 volts 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.

Homemade boat motor from a trimmer

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 ready-made solution the upper gearbox, engine power supply and control systems do not require modification.

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 everything possible options using engines of different purposes, evaluating them positive aspects and problematic issues, it is necessary to supplement the code of laws of the ancient Assyrian kings, which does not count the time spent in creative searches as life.

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.

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Find out more about the bait!

It has long been developed by folk craftsmen and is in demand. Many fishermen have already tried such an electric motor, using all kinds of constructive solutions for its manufacture. It is worth noting that there is a trend towards increasing the assembly of electric motors for a boat with your own hands using a drill, since not every fisherman can afford a factory electric motor.

Today we will tell you how to make it yourself electric motor from a drill for your boat and what you will need for this.

Benefits and technical features homemade electric motor for a boat based on a drill

The advantages of such a motor will be as follows:

saving on an expensive factory outboard motor;
Environmental legislation provides for regulations regarding the use of factory electric motors for boats. This does not apply to handmade products;
almost silent operation of the electric motor;
savings compared to using an internal combustion engine.
Before you start assembling the motor with your own hands, you need to choose a drill. The key parameter for choosing a particular model is its power, which should be at least 150 watts.

You should also take into account such a parameter as the voltage of the electric motor. Many people think that you need to use a 10-volt cordless drill, but this is wrong. The battery will deteriorate over time and will have to be replaced, which will be very expensive. It is better to take a drill operating on 12 volts, for which you can easily select the right battery, which can be easily connected using wires and fits comfortably in the boat.

Once you have selected the right drill, you should prepare the rest of the tools required for further work:

square pipe;
clamps;
gearboxes;
metal tube with a diameter of 20;
shaft rod;
metal sheet for the impeller;
welding machine;
self-tapping screws;
Bulgarian;
screwdriver

To create a mechanism for lifting the impeller in a boat, you should weld metal pipe to clamps. A base in the form of a truncated pyramid frame should be attached to this pipe, with its smaller base directed towards the water. At the top of the base there is a frame for the bearing, and a tube is welded at the bottom. The shaft should be passed through the tube and bearing.

It is used as a wire or tube; the diameter should be smaller so that it is not heavy. The best tube is:

it is provided by bearings at the top and bottom;
friction will be less;
there will be no vibration of the shaft in the pipe body.

Gearboxes and propeller: installation and manufacturing techniques

Gearboxes must be installed on both sides of the shaft. It is recommended to install them yourself, depending on the type of electric motor itself, in order to correctly select the number of optimal revolutions, but this is very difficult and time-consuming.

You can take the gearbox from old technology or purchase a new one in the store. The main condition for him is the transmitting number should not be large, it is desirable that it be able to reduce the number of revolutions by five times. A number of experts believe that this is small and will not be enough for the boat to reach normal speed, but this is not at all the case.

The lower part of the pipe is equipped with a gearbox from an old grinder and an impeller is added. The propeller can be taken ready-made from old devices, for example, an old cooler from a computer can serve as an impeller, but this impeller will not be able to provide water flow for the fast movement of the boat.

And you can make it yourself using sheets of metal, this is done like this:

cut a square with a side of 30 cm from a tin sheet and drill 4 holes in it from the center of each side to the place of diagonal intersection;
There should be a distance of 5 cm between the slots;
the edges of the “petals” need to be rounded and each blade rotated 30 degrees from the axis;
when using a gearbox from a grinder, make a hole in the central part and secure it to the shaft with a locking nut;
connect the upper gearbox to the drill. It will be great if the gearbox shaft can be clamped in its head. Then you can clamp the shaft and secure the drill to the base with clamps.

If the design does not match the size of the drill, a tube is used to connect the gearbox and the electric motor, which is put on the gearbox shaft. To prevent the shaft from rotating inside, it must be fixed: done through the tube through hole and secure with a pin.

So, our electric boat motor is almost ready for work, all that remains is to test it. For this no need to put it on the boat right away and turn it on. First, the impeller is lowered into any container filled with water, and then the motor itself is turned on. You should feel the flow being created with your hands and check its operation by switching different modes. If you feel movement, then you can put a hand-made motor on a boat and use it in a pond. During test work, the motor should operate in normal mode and create the desired background noise.

However, this design of a homemade electric motor for a boat has the following disadvantages:

the motor cannot be rotated relative to the vertical axis, so when steering the boat you will have to use oars, and this is inconvenient when fishing;
a homemade boat motor does not have a convenient control system.

Gearbox and its effect on engine operation

It is worth adding that a correctly selected gearbox for a boat motor is one of the key conditions for its reliable operation and duration of operation. It will also not be superfluous to calculate as accurately as possible all the necessary calculations. It will not be easy to do this yourself, so this type of work can be entrusted to a specialist, even if you are making the motor yourself. If you don’t have the opportunity to contact a specialist, then carefully read all technical publications regarding gearboxes.

For example, some hobbyists claim that a gearbox from a regular trimmer is perfect as a boat gearbox. You only need the gearbox itself, the shaft and a protective tube, which should be connected to the motor.

Speaking in general about homemade electric motor for a boat, then it will cost you much less than the factory one, but you cannot consider it to be a full replacement. Such a unit significantly inferior to it in terms of speed and power, you will also be limited in terms of the choice of operating modes.

The DIY electric boat motor discussed above can reach a speed of about 8 kilometers per hour, and charging the battery from a car takes about 5 hours to operate it.

This motor is suitable for a lightweight boat with two passengers. It operates smoothly and quietly, and is easy to operate and transport. If you do not have great requirements for the motor, you can safely start assembling it yourself.