Compact inflatable vessels are experiencing a real renaissance among fishermen and hunters, tired of carrying heavy metal hulls. PVC boat with 5 hp engine It's not just a toy for quiet lakes, it's a full-fledged working tool that can get you to the coveted point of the cooler with minimal fuel consumption, and the ease of transport in the trunk of a car makes this tandem accessible to a wide range of users without a trailer.
However, choosing a specific model and the right engine requires understanding the technical nuances that beginners often miss. The power of five horsepower seems small, but it allows you to legally do without a license and registration in the GIMS, which greatly simplifies the life of the owner. In this article, we will discuss in detail how to choose the optimal bundle of “transom-motor-screw” and avoid common errors during operation.
Benefits of Ligament: Lightness vs Power
The main trump card of this configuration lies in the balance between load capacity and mobility. PVC From 2.8 to 3.2 meters long, combined with a lightweight two-stroke vehicle weighing about 10 to 12 kg, allows one person to assemble and launch a vessel in 15 to 20 minutes, which dramatically changes the way we fish: you can go to a pond spontaneously without having to plan complex logistics with a trailer.
It is important to note that 5 hp engine. Many models have a 5-force capacity to comply with the law, but are structurally ready for a little forcing or retuning of the carburetor by an experienced mechanic, but even in the runoff state, such an engine confidently leads one person to plane with minimal load, which is critical for overgrown areas or strong headwinds.
Economy is another compelling argument for this bundle: fuel consumption is only about 1.5-2 liters per hour on full gas, which allows you to spend a whole day on water with one canister. Two-stroke engines They require mixing oil with gasoline, but their simplicity of design ensures high reliability and maintainability in the field.
⚠️ Warning: Never exceed the manufacturer's declared power of the engine, and installing a more powerful engine on a transom that is not designed for it can cause the transom to tear off and sink the boat at the most inopportune time.
Criteria for the selection of the body and transmuner
When you buy motorboat The key element is the design of the transom panel, which must be reinforced with an aluminum or plywood insert that is protected from water, because this is the main traction load, and the weak transom will begin to deform under the vibration of the motor, which will lead to loss of leakage and destruction of cylinders at the attachment points.
The size and shape of the inflatable tubes directly affect driving performance, and for motorization, it is better to choose models with a cylinder diameter of at least 36 cm and the presence of an inflatable keel. Inflatable keel (NDND) Or a hard floorboard will significantly improve the planing output, allowing the body to "float" at lower engine speeds. A flat bottom without a keel will scour the course and require constant control of the rummel.
Pay attention to the presence fin-line They help to remove the spray from the engine and passengers, improving visibility and comfort, and also an important parameter is the presence of a rigid floor, which distributes the load from the motorist's legs and engine weight, preventing deflection of the bottom under the pressure of daydvut.
What is the difference between NDND and paiole floor?
inflatable floor (NDB) provides better hydrodynamics and comfort, as there are no rigid elements, but requires more time to assemble and dry. solder floor (aluminum or plywood) assembles faster, harder to touch, but has more weight and can creak when cruising. 5 hp NDNDM is preferred for better streamlining.
Choice of motor: two-stroke or four-stroke?
In the class of small power up to 5 hp, the undisputed leader remains two-strokeThey often weigh less than 10-11 kg, which allows them to be carried manually without using a trolley. Four-stroke analogues of the same power will be heavier by 30-40% due to the presence of an oil crankcase and a more complex gas distribution mechanism design.
Nevertheless, four-stroke They have their advantages: they are quieter, more economical and do not require a fuel mixture. If you plan to fish mainly alone and the weight is not critical for you, this option will provide a more comfortable stay on the water. However, for the tandem boat + 5 hp where mobility is important, the two-stroke remains the classic choice.
When choosing a brand, you should focus on the availability of service centers and spare parts in your region. Popular brands like Tohatsu, Mercury, Yamaha or their licensed copies (HDX, Sea-Pro) have a similar design, but may differ in build quality and resource. Engine resource It directly depends on the quality of the oil and gasoline used, so you should not save on fuel.
⚠️ Attention: When running a new engine, the modes specified in the instructions are usually 10 hours of operation at different turns, but without fully opening the throttle, ignoring the break-in reduces the life of the piston group by many times.
Use only high-quality two-stroke oil labeled TC-W3. Cheap oils for chainsaws and motor blocks will cause candles to coking and the engine to fail.
Screwing and traction adjustment
The standard propeller, which comes with the motor, is often a compromise solution. PVC With one or two passengers, the standard propeller pitch may be too high to allow the engine to reach maximum speed, resulting in the motor running in overload mode without developing full power.
The rotor is selected experimentally or according to matching tables. Reducing the pitch of the screw (for example, from 4 inches to 3 inches) allows you to increase engine speed and quickly bring the boat to plane. However, the maximum speed may decrease slightly, but the thrust will improve at low revs, which is important when trolling or in windy weather.
The material of the propeller also matters. Aluminum propellers are cheap and repairable, but they bend when hit by underwater obstacles. Stainless steel It's stronger and more efficient, but if you hit it hard, it can damage the gearbox, and for beginners, aluminum propellers are a safer choice.
| Type of screw | Diameter (inch) | Step (inch) | Recommended application |
|---|---|---|---|
| Staffed | 8.0 | 4.0 | Universal, 1-2 people |
| Freight. | 8.0 | 3.5 | Boat full load, trolling |
| Speed. | 7.5 | 4.5 | One driver, light boat. |
| Mud | 7.0 | 3.0 | Shallow water, overgrown areas |
A properly selected propeller can increase the speed of the boat by 3-5 km / h and reduce fuel consumption by bringing the engine to optimal speeds.
Transportation and preparation for descent
One of the main advantages of the kit is the possibility of transportation in the trunk. Boat assembled It's easy to fit in a mid-range wagon or hatchback, and it's important to pack the engine properly, and it should be transported in the operating position (vertically) or on the side specified in the instructions so that the oil doesn't get into the combustion chamber.
The water assembly process takes a little time, but requires consistency: first, the cylinders are inflated to the operating pressure (usually 0.2-0.25 atm), then a floorboard is installed or the NDNDL is straightened, and only then a transom is attached and the motor is hung. Pressure control It is mandatory, since in the sun the air in the cylinders expands, which can lead to rupture of the seams, if initially pumped them "before the toll."
For ease of carrying and assembly, it is recommended to use special backpacks for the boat and a cart for the engine, which will save your strength for the fishing itself. Also, do not forget about the anchor tile and rim bolts, which must be securely secured in the bow for safe parking.
☑️ Assembling on the shore
Safety and service at sea
Operation low-power It's not a safety exemption. It's a requirement to have life jackets on board, even if you're a great swimmer. PVC boat is stable, but moving a load abruptly or standing up full-length on the go can lead to tipping over, especially on the wave.
Regular maintenance includes flushing the cooling system with fresh water after each outlet to salt water, checking fuel hoses for cracks and cleaning the soda candle. Ignition candle It is an indicator of motor health: black plaque indicates a rich mixture or bad oil, white - about overheating or poor mixture.
Keep the boat and the motor in a dry, ultraviolet-protected place. Prolonged exposure to sunlight destroys the structure of PVC and the plastic of engine parts. Winter storage requires complete conservation of the fuel system: gasoline must be produced or drained, and the cylinders are filled with conservatory oil.
⚠️ Warning: Never leave the motor unattended in water, even for a short time; shells, algae, or corrosion can start after a few hours of parking, especially in salt water.
Frequently Asked Questions (FAQ)
Do I need to register a PVC boat with a 5 hp engine in GIMS?
According to the current legislation of the Russian Federation, registration is subject to small vessels weighing more than 200 kg (in running order) OR with an engine capacity of more than 8 kW (about 10.8 hp). Since the 5 hp engine is weaker than 10.8 forces, and the weight of the boat with an engine rarely exceeds 200 kg, registration and rights are not required.
Which gasoline is best used for a two-stroke engine?
The best choice is AI-92 gasoline with the octane number recommended by the manufacturer. Using AI-95 with a large number of additives can lead to the formation of sodium. Gasoline should be fresh, its shelf life is not more than 1-2 months.
Can I put the 5 hp engine on a boat designed for 3 hp?
The trunk and the design of the cylinders of such a boat will not withstand the increased thrust and vibration, which will lead to the destruction of the transom plate and the potential rupture of the cylinders, which is life-threatening.
How to Dilute Oil with Gasoline?
The mixing ratio depends on the type of oil and the manufacturer's recommendations (usually 1:25 or 1:50), mix in a clean canister, shaken until a homogeneous emulsion is obtained, and only then pour into the tank.