The need to convert an ordinary boat into a motor boat can arise for various reasons. But here's how to do it if the budget is limited and there is not enough money to buy a ready-made motor. There are many options to help make a fully working outboard motor out of improvised 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 important parts 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 lawnmower wins in many ways, and the design of its engine is closest to the design of a purchased outboard motor. This is proved by the drawings that many craftsmen compared before making a choice on what to take as a basis for a home-made engine for a boat. And so let's consider:
- An engine that will save a huge amount of fuel (since the lawnmower is often used). What's more, it can be four-stroke, just like on conventional powerboats. However, this is very rare and 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 structure predisposes to the fact that it can be easily converted to a boat motor without much straining
The main difficulty in modifying the trimmer is that the mower engine will not always be able to overpower the movement on the water. This is primarily due to the different technology of operation of each of the engines.
On a gasoline mower, it has a large number of revolutions due to low torque. For boating, the exact opposite is needed. However, this is easily fixed. But this requires tools (everyone has them) and drawings.
The main list of tools needed for work:
- The trimmer itself is the basis of the future boat motor. Since most often a home-made motor is made for a rubber boat, which has a small weight and size, the trimmer power 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.
- The 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 vise or any other tool that allows you to secure objects (in this case, the motor on the boat)
- Metal welding machine (any, but semi-automatic is better)
Manufacturing process
Creating an engine for a boat based on the above materials can take place in different ways. Either all the main components that must be present are bought, or they are made on their own (does not cause difficulty) using improvised materials
Calculations must be made, according to which it is then necessary to draw up a drawing of the screw. It is done on the basis of many parameters, the main ones are 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 bar into a straight one.
If the screw is made by hand on the basis of calculations and drawings, then the edges must be sharpened well (almost at an acute angle). The propeller blades are usually made bent by about 10 mm. Since the material for manufacturing is still the same duralumin, in the case of poor screw performance, you can safely bend it, since the material is very elastic.
The screw is mounted in place of the trimmer head, which is removed when disassembling the mower. Be sure to use a nozzle in the form of a ring, as 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 online. 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 bike from an old bike. After the entire assembly, it is enough to fix the resulting structure on 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 a very effective solution. First, at the stage of its disassembly, you need to pull out the tire and the pump that supplies oil to the chain, the lever that allows you to adjust the speed and the gas tank (not suitable due to the design of the motor).
Using textolite material, it is necessary to make an attachment 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 work most efficiently).
In the lowest part of the entire structure, it is necessary to insert a steel sleeve by pressing, which will be attached to the deadwood. Deadwood will be made from an inflatable paddle (cheap), which is made from duralumin. The clutch responsible for the clutch must be connected through a special shaft to the gearbox.
The gearbox can be made from the constituent parts of the grinding machine. It is filled with oil used to lubricate the car's transmission. The structure is still fastened with a clamp or vice. The steering wheel that performs maneuvers can be made from a duralumin pipe (the rest of the oar).
For the gas handle, as in the case of a trimmer, a speed bike from a bicycle can act. The screw, as the main part of the motor, can be made in the same way as in the case of a trimmer, using duralumin. In this case, the calculations carried out to determine the size of the screw remain the same.
A water jet outboard motor is a unit that sets the watercraft in motion by the jet force of the water flow created by it.
The principle of operation of the water jet is that the water sucked in by the impeller through the intake grate passes under pressure in the narrow body of the propulsor and, leaving through the narrow nozzle, creates a jet stream that propels the boat.
Such a motor consists of the following parts:
- Air-cooled or water-cooled four-stroke gasoline engine with 1 to 4 cylinders. Engine power on jet engines ranges from 2.0–2.5 hp. on budget models up to 100–150 hp on premium engines.
- Controls - tiller with throttle. Used to change the speed and direction of the boat. In premium models, there is no tiller, and the motor is controlled remotely using a remote control specially located next to the angler.
- Deadwood (leg) - a casing located between the propulsor and the engine with a shaft enclosed inside it, transmitting rotational movements from the engine to the propulsion impeller. Also on the deadwood there is a clamp (clamp) for mounting the motor on the transom of the boat.
- The mover is the working part of the jet motor, which includes a body with a water intake grate and a nozzle located at different ends. An impeller located inside the propulsion body creates a jet stream of water - a propeller located vertically or at a slight angle, driven by a deadwood shaft. When the engine is running, it sucks water through the intake hole and when it passes through the tunnel inside the body, it accelerates the flow to high speed, eventually throwing it out through the nozzle. Thus, the jet stream of water obtained during the operation of the impeller moves the boat forward.
Important. In more detail, the device, characteristics and features of using a jet outboard motor of a certain model are described in the instruction manual attached to it.
Advantages and disadvantages
This type of motor has both advantages and disadvantages.
The benefits include:
- Ability to quickly maneuver, turn and turn around
- The ability to overcome shallow waters, overgrown with grass and snarled sections of reservoirs.
- Safety - the impeller is located inside the propulsion body and cannot damage a swimmer or spearfisher who is near the boat in the water.
- The stability of the watercraft - due to the constant injection of water by the propeller, the boat, as it were, sticks to the surface of the reservoir, thanks to which it withstands sharp turns even at high speed.
In addition, this design of the water jet avoids the winding of algae and grass on the impeller, its damage by branches and snags.
The disadvantages of this kind of motors include the risk of damage to the propulsion body with frequent movement in shallow and cluttered areas, reduced efficiency at high speeds, high cost and expensive repairs of the unit in specialized workshops and service centers.
Application
Water cannons are used by fishermen and lovers of river walks in areas with medium and shallow depths and a large amount of grass, snags, stones. Thanks to the use of a closed screw in the design and a water intake hole protected by a grate, it is protected from jamming when large branches, stones and grass get inside. Small grass and algae that get inside the propulsor along with the flow of water through the water intake grate are crushed by the impeller and do not affect the operation of the motor.
Water cannons are well suited for moving along rifts and shallows
Important. The speed and safety of movement of a boat with a jet engine is affected by its installation. When properly positioned, the plane of the intake grate should be slightly above the level of the bottom of the boat. In this case, the unit will be protected from hitting the bottom, stones and snags. When water is taken in, air will not enter it, which causes failures and a decrease in engine power.
Jet nozzles
Jet attachments for outboard motors are devices that allow you to turn a screw motor into a water jet at low cost.
Such a nozzle consists of a strong body (snail) with a nozzle and a water intake grate (“inteik”) and an impeller located inside it with a special sleeve.
The principle of operation of such a nozzle is similar to that of a water cannon - the water sucked in by the impeller through the water intake grate accelerates inside the nozzle to a high speed and, leaving through the nozzle, ensures the movement of the craft. For braking, a special damper is used to block the nozzle and ensure an instant stop of the boat.
The main advantages of such a device include a low price, simple and labor-intensive installation, an increase in the passability of a boat with a motor in previously inaccessible shallow water areas. The disadvantages that water-jet nozzles for an outboard motor have include severe clogging of the turkey with small grass, severe damage to the hull during inaccurate movement through heavily snarled and cluttered shallow waters, careful care and maintenance of the impeller and bushing.
DIY manufacturing
You can not only buy a water cannon, but also make it yourself. How you can make a similar unit for pvc boats from a motor for lawn mowers and improvised means is described in the following video.
The manufacturing process of such a water cannon is as follows:
- a shaft is made for the engine from special high-strength steel;
- the shaft, together with 2 support bearings, is placed in a protective casing made of lightweight aluminum pipe;
- at the end of the shaft, a home-made jet nozzle is mounted - a vertically located impeller in a snail housing. In order to prevent water from entering the housing of the jet nozzle into the shaft casing, it is sealed with an oil seal.
- fastening of such a water jet to the transom of the boat is carried out by means of a clamp welded to the shaft casing.
Such a home-made jet engine, although it will not develop a very high speed, will still effectively force shallows and rifts on rivers, shallow areas of lakes and reservoirs.
Important. Since such a water jet has a tank of small capacity, you should take fuel canisters with you to top up the fuel: (5 l - when walking a short distance, 10 l - for long and long voyages).
Top 3 expensive models
The most common and popular models of water cannons among professional anglers and athletes are the following:
YAMAHA F JET 40 is a reliable Japanese water cannon from the YAMAHA company (Yamaha). The power unit is represented by a 3-cylinder 4-stroke gasoline engine with a volume of 747 cc. cm with forced electronic fuel injection. The total engine power is 40 hp. s., at the outlet of the water jet - 30 l. with. The motor is started using electronic capacitive ignition. A special remote control is used to control the engine speed and change the direction of the boat. The engine is cooled by water sucked in through the water intake. The fuel tank has a volume of 25 liters. At maximum speed, the motor consumes up to 14.8 l / h. The weight of the motor is 103 kg.
Such a water jet is suitable for boats and capacious boats when sailing on large and medium rivers, large reservoirs. Its average cost is from 450,000 to 500,000 rubles.
Tohatsu MD 25 Jet is a simple and reliable Japanese water jet engine from Tohatsu (Tohatsu). Equipped with a water jet 2-cylinder gasoline 2-stroke engine with a capacity of 429 cc. The total and net engine power are 30 and 25 hp, respectively. The starting system of such a motor is electronic (CDI). Management - tiller. Efficient cooling is ensured by supplying sea water sucked in by the unit into the engine jacket. Gasoline is poured into a 25 liter fuel tank. With a maximum fuel consumption of 8.75 l / h, this tank volume provides continuous movement of the boat for 2.5–3 hours. This motor weighs 59 kg.
You can buy such a jet engine for 250,000–260,000 rubles.
This American water jet is powered by a 2-cylinder, 2-stroke, 429cc petrol engine. cm and a power of 30 hp. The output power of the unit is 25 hp. The engine has a fairly reliable and simple manual start system, convenient tiller control, water cooling. Gasoline is poured into a 24 liter fuel tank. The maximum fuel consumption of such a water jet is 8.0 l / h. The weight of the motor suspended on the transom of the boat, excluding water in the cooling system and the jet body itself (“dry weight”), is 60 kg.
You can buy such a water cannon for 260,000–280,000 rubles.
Important. It is better to purchase water cannons of famous brands from official dealers and trusted sellers. Cheaper analogues and fakes, compared to the originals, will have poor quality and a short warranty.
If we consider Chinese water cannons, then among them the engines of the Golfstream series are the most popular -
T30A BW JET 25 HP and T20 BW JET 20 HP These models are equipped with a 496 cc 2-cylinder 2-stroke gasoline engine. cm with electronic ignition, water cooling and carburetor. Such water cannons are controlled using a convenient and simple tiller. The fuel tank is remote, with a volume of 24 liters. Unlike analogues of Japanese and American production, such water cannons have a lower cost, they can be purchased for 195,000–200,000 rubles.
Golfstream T30A BW JET, 25 hp
Each outboard jet motor described above is installed on both capacious PVC inflatable boats and large aluminum boats. Their main disadvantage is their high price.
Top Budget Water Cannons
Among the budget models suitable for a simple rubber boat, the following models of water cannons are popular:
"Stalker-Jet"
It is a lightweight American-made waterjet, equipped with a 32.6 cc single-cylinder 2-stroke gasoline engine. see air-cooled. The power of such a power unit is 1.6 hp. The engine is started using an electronic ignition system. For control is a simple and convenient tiller. A 0.9-liter fuel tank built into the motor housing ensures non-stop movement of a boat with such a water cannon for 1 hour. Small in weight (only 5 kg), this unit is ideal for inflatable boats. Its average price ranges from 15,000 to 16,000 rubles.
"Mikrosha-M"
It is an ultra-light water cannon designed for inflatable boats. Equipped with a 30.5 cc single-cylinder 2-stroke gasoline engine. cm, air-cooled and manual start. A small 0.6 liter fuel tank is built into the engine housing. The disadvantage of such a water cannon is its large weight for such power - 10 kg. You can buy such a unit for 12,000–13,000 rubles.
Thus, jet boat engines and nozzles that perform their role are a good alternative to common screw units. When moving through shallow waters and heavily cluttered areas of reservoirs, due to their design and location on the transom of the boat, they are the only option for a power unit for a watercraft of any size and type.
This video contains all the information that the niche is only in video format, you can not read it but just watch the video.
Hello everyone, today I will tell you how you can independently make a floating mini-boat on batteries with a motor, more precisely with a fan, andpractically from the trash, but this is provided that you have the following "ingredients":
1. Foam tray
2. Battery box
3. Wires
4. Fan (motor) from the computer (in my case 80x80mm)
5. 2 nails 90mm long
Well, optionally you can also:
1. One or more LEDs
2. Resistors for LEDs, Ohm so 300-400
3. Cardboard or corrugated paper(from some box)
4. Scotch
I made just such a cabin with LEDs, inside a box with batteries, the LEDs are connected through 320 Ohm resistors, you canmore, for example 1 kOhm, will simply shine weaker. Without resistors, they will instantly burn out when a voltage is applied more3.5 V. As you can see in the first photo, I have 2 boxes for batteries, one I broke out of some brokena child's toy, it still went to waste, and I once bought myself a second one.
When using the first box, you can get up to 4.5 V on new batteries, which, in principle, should be enough to startfan and some kind of air flow that will make your boat move, but it is better to take a larger box. Since inthe second box fits as many as 6 AA batteries, then on new batteries you can get up to 9 V, almost like Krona onlythe capacity will be several times larger, and in comparison with the first box there will be a good increase in speed.
You can do without boxes at all, and wrap everything, say, with electrical tape or work with a soldering iron, but I personally preferlike the boxes.
I got a foam tray after buying minced meat in a supermarket, which, by the way, was used in the form of cutlets.
Mmm... yum
Well, let's proceed directly to the assembly itself, we put the nails into the mounting holes of the fan as shown in the photo:
What are nails for? The fact is that with a strong air flow, the fan may fall, or when the stern hitsbath in my case. Then we connect the fan to the box, that is, the “+” of the box to the “+” of the fan (red wire) and “-” to “-”fan (black) yellow, if it is not touched, and voila :) the boat is assembled, the fan spins creating airstream, which in turn moves the boat.
The fan, by the way, is from an old 2500 rpm computer power supply, which can be seen on its label:
SPDM 80 25 - the first digit is the size and the second turns are multiplied by 100.
More and more anglers are thinking about installing a motor on a boat. It allows you to speed up the movement on the reservoir and save 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 it is forbidden to use gasoline engines, electric current is used as a driving force. In other cases, it is better to choose devices with gasoline power units.
Many anglers have faulty electrical or gas equipment in their closet or garage. If the motor in it is working, then such a device can be modified for an existing boat. In some cases, it is even cheaper to buy a new screwdriver or a lawn mower and modify the device than to buy an outboard motor. It is the financial issue that pushes numerous "left-handers" and "homemade" to unique developments.
- To make a homemade electric outboard motor, you will need a cordless drill or screwdriver. In this case, the angler 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 appliance that produces more than 300 watts 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 outboard electric motor will work silently, which is very important for good fishing. In addition, it will be cheaper to replace a failed electric motor than to repair a boat engine.
- Do-it-yourself gasoline engines made for the boat allow you to 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 on which of the devices is available.
- Trimmers require the least modifications. They seem to be designed to be installed on a fishing boat. It is enough just to put a propeller instead of a reel with a fishing line and the outboard motor from the trimmer can already be tested on a nearby pond.
- Engines from a chainsaw, motorcycle or walk-behind tractor will require more intervention from skilled hands. Requires an angle gearbox from a grinder, a shaft and a propeller.
All homemade boat motors require a special fixture to attach to the side of the boat. It's one thing when the ship has a transom, to which you need to attach the engine. It is somewhat more difficult to fix the power unit on a conventional rubber band with inflatable sides around the perimeter.
Making an engine from a screwdriver
Good homemade motors for boats are obtained on the basis of cordless screwdrivers. The use of a device with a battery voltage of 12V looks optimal. 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 do-it-yourself boat 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 clamp system to which the engine is mounted. It is rigidly attached to the transom with a steel frame and plate. Clamps are equipped with rings through which the tube will pass. A shaft of steel wire or bar will pass inside. Bearings of suitable dimensions are pressed inside the tube to ensure easy sliding.
Reducer 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 a grinder. In the screwdriver's chuck, it is enough to clamp the top of the shaft to ensure a secure connection.
The role of a propeller can be played by an impeller from a car pump or a computer cooler. But such a do-it-yourself electric motor will not be able to provide the boat with the necessary speed. You can make a propeller from a piece of stainless steel 2.5-3.0 mm thick.
- First you need to cut a square blank measuring 30x30 cm.
- A square with a side length of 5 cm is marked in the center. Diagonal lines are drawn through the corners. They will be cut to a small square.
- Each petal should be rounded and rotated along the axis by 30 degrees.
- A hole is made in the central part for fastening to the gearbox.
- It remains to securely connect everything and test the resulting outboard electric motor with your own hands.
Refinement of lawn mowers
The outboard motor from the trimmer requires a little refinement in order to get a workhorse for the boat. The advantage of gasoline trimmers is their low price and maintainability. Homemade motors for boats based on lawn mowers have a built-in tank, shaft and gearbox. You can look for a special conversion kit, which will have a propeller and a stainless steel drive, as well as a set of adapters to the trimmer shaft. Often there are kits with a clamp for installation on a transom, so there will be no problems with fastening to a watercraft. If you act according to the attached instructions, then the outboard motor from the lawn mower can be done in 20-30 minutes.
More skills will be needed from the angler if he decides to radically change the design of the trimmer. In this case, there is a huge scope for imagination and ingenuity. One option involves the manufacture of a vertical leg.
- To rotate the shaft 90 degrees relative to the engine, you need a gearbox from a grinder.
- The existing tube from the trimmer must be shortened with a cutting machine. Inside the sleeve it is better to replace the bearings.
- A simple screw can be made from a strip of duralumin 10x30 cm 2 mm thick. Having attached a stencil with a two-bladed screw to the workpiece, it is necessary to make markings. You can cut the screw with a grinder and a chisel. The edges must be filed. Putting the plate on a flat surface, bend both blades to a height of 1 cm.
Advice! During the test, you can make the necessary adjustments. At low speeds, the blade is undercut or the pitch of the propeller changes.
- A hole is drilled in the center to connect to the shaft. So that during rotation the blade does not touch the vessel's balloon, it is better to make an annular nozzle. The outboard motor based on the trimmer is ready, you can go to the pond.
Manufacture of mounting and installation on the boat
Homemade motors for boats require a special mount. The principle of its manufacture is as follows.
To securely install the outboard motor from a lawn mower, you must use a ring to which the belt is mounted. To connect the braid to the transom, you can use an old manual meat grinder. The lower part is cut out of it, a hole 12 mm thick is drilled in the transverse plane of the body. It is important to carry out some refinement with a hairpin with a diameter of 12 mm and a length of 10 cm. One side is flattened, a hole 6 mm thick is drilled in it. An M6 bolt is inserted into it, then the eye of the lawn mower is mounted and the nut is screwed on.
Installation of a home-made installation on a vessel is carried out in the following order.
- A self-made mount is mounted on the transom of the boat using a stud and the corresponding nut.
- Now the motor is installed and fixed with a threaded connection. It remains to check how it turns on the boat in different directions.
Homemade motors for boats are not only an opportunity to increase the speed of your boat. The manufacturing process will allow the brain to turn on at full speed, as a result of which another folk invention may be born.
DIY boatMaking a boat with your own hands is only the first step. You don't want to manually row it all the time, do you?
Stas comments:
This trimmer will be reworked quickly, since it has no water cooling, but only air cooling!
Artem comments:
With a fig well up? The trimmer plows the whole day without problems, mowed 40 hectares with it (got sick). And such alterations in Ukraine are driven for nothing - they die from wear and tear, but are restored by overhaul with rings.
Valera comments:
here, rather, a screwdriver will screw up, since it is not designed for long-term work and heats up very quickly
Artem comments:
We rode on a motor from bezkosy. Norm rushing on an inflatable!
Igor comments:
just add a motor
ttt comments:
It just rumbles like a tractor.
Peter comments:
Good afternoon. I plan to buy a Haswing Osapian electric motor for fishing this model: https: //
What can you say about this company? Maybe someone dealt with them, do they break badly and do they need to be serviced somehow? Thank you!
sergey comments:
If you understand that your need is charitable help, then pay attention to this article.
Those who, without your participation, may lose an exciting business, turned to you for help.
Many children, boys and girls, dream of becoming pilots on the track.
They go to classes where, under the guidance of an experienced coach, they learn the techniques of high-speed driving.
Only constant exercises allow you to overtake correctly, build a trajectory and choose the speed.
The basis of victory on the track is a good qualification. And, of course, professional cards.
Children who participate in clubs are completely dependent on adults, because lack of money and broken parts do not allow them to participate in competitions.
How much pleasure and new sensations the guys experience when they get behind the wheel and start driving the car.
Maybe not only the champions of Russia, but even the future world champions in this sport grow up in such a circle?!
You can help the children's section of karting, which is located in the city of Syzran. They're in a dire situation right now. Everything rests on the enthusiasm of the leader: Sergey Krasnov.
Read my letter and look at the photos. Pay attention to the passion with which my pupils work.
They love this developing sport and really want to continue their education.
I appeal to you with a request to help the karting section survive in the city of Syzran.
Previously, there were TWO young technician stations in the city, and each had a karting section. Karting was also in the Palace of Pioneers. Now there is not a single station in the city, and the circle in the Palace of Pioneers was also destroyed. Closed - does not turn to say, just destroyed!
We fought, wrote letters, everywhere they got the same answer. About five years ago I went to the governor of the Samara region for a reception. He did not accept, but the deputy accepted me.
After that, we were given a room where we were based. We have a lot of children who want to go karting, but very poor material conditions do not allow recruiting children.
And most of the karts need repair. This is the position our circle is in.
We also turned to the mayor of the city of Syzran for help. We are waiting for help for the second year. We decided to contact you via the Internet for help.
Contact me, ADDRESS FOR PARCEL, 446012 Samarskaya, 47, you can contact via social networks SERGEY IVANOVICH write to the mail [email protected] Always, being on the wave of success, one must do works of mercy, give alms. And if the Lord helps in difficult circumstances, then do not forget about gratitude later. Then He will not forget about your needs.
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