Choosing a swimming aid for fishing or resting on the water often starts with the question of engine power. Motor 5 horsepower It's a kind of middle ground for small bodies of water, allowing you to move quickly without having to register with the GIMS. However, not every boat is able to unlock the potential of such an engine, and some models can be simply dangerous in conjunction with it.
Owners often have to find a balance between the weight of the case, the carrying capacity and the cost of the kit. Boat to 5 hp. It should have sufficient bottom rigidity and a transom that can withstand vibrations, but still be easy to transport. In this article, we will discuss the technical nuances that will help you avoid mistakes when buying.
Let's look at the basic types of designs, their advantages and disadvantages. The maximum power of the 5 hp motor for inflatable boats is often limited by the design of the transom.And we'll also talk about safety, because it's not safe to neglect it on the water.
Features of operation of low-power motors
Low-power internal combustion engines have their own unique performance specifications. They are usually two-stroke, which requires that they be used in a single-stroke system. petrol-oiling This creates additional requirements for fuel quality and maintenance, especially if the boat is used sporadically.
Speed is dependent on the load of the boat, and if you plan to take two adults and equipment on board, you can do it. 5 hp engine. It can only bring the boat to plane under ideal conditions, otherwise it will move in displacement mode, which greatly increases fuel consumption and reduces maneuverability.
⚠️ Warning: Prolonged operation of the engine at full speeds with underloading of the boat (only one person) can lead to engine overheating and damage to the lower unit due to insufficient cooling with off-shore water.
It's also important to consider the noise of these units. Despite the small volume, two-stroke engines create a characteristic high-frequency hum. For quiet fishing with a sonar, this can be a critical factor that deters cautious fish.
Choice of body material: PVC or aluminum
The market offers two main directions: inflatable vessels made of polyvinyl chloride and metal kielson boats. PVC Boats They're more versatile, they can be folded into the trunk of a car, they're softer when you touch the side of the car and they're cheaper to repair, but they're more susceptible to punctures and take time to pump.
Aluminum models, or Kazankas, have the eternal life of the hull, they are not afraid of sparks from the fire, sharp branches and can be stored at any temperature, but the weight of such a boat often exceeds the capacity of one person to carry and to carry. 5 hp engine. Heavy aluminum can become an anchor, not allowing to develop a good speed.
When choosing a material, you should pay attention to storage conditions. If you don't have a garage or dry space, PVC will have to be constantly blown and inflated, which wears out the valves and seams. Metal only requires corrosion protection, but takes up a lot of space.
The Hidden Deficiencies of Aluminum Boats
Aluminum is highly thermally conductive, the sides get hot in the sun, and cool down quickly in cold water, creating discomfort when touched, and the metal resonates perfectly well with sound, so the thud of tackle or cargo will be heard far around.
The comparison table will help determine the priorities:
| Parameter | PVC Boats | Aluminum boats |
|---|---|---|
| Body weight | Light (20-40 kg) | Heavy (40-70 kg) |
| Transportation | In the trunk of a car | Only on the trailer/top |
| Resistance to puncture | Low. | High. |
| Price. | Medium/High | High. |
Technical requirements for transom and bottom
The key safety element is the transom, which is the one that takes over the main traction and the vibration. For a 5-strong motor, it's critical that the transom is the one that is the one that is the one that is the main driver. reinforced by overhead elements The soft transom will quickly become unusable, and in the worst case, the motor can come off on the go.
The type of bottom also plays a role: Low-pressure inflatable floor (LDPB) is comfortable, but at high speeds it can bend, creating additional resistance to water. Hard solder bottom (plywood sheets) or inflatable keel provide better hydrodynamics and course stability.
⚠️ Warning: Never use a boat with a soft inflatable floor (without rigid elements) at speeds above 15 km / h - this can lead to deformation of cylinders and loss of controllability of the vessel.
The height of the transom is another parameter that is often overlooked: the standard is 381 mm (15 inches). If the transom is lower, lower unit can capture air, if higher, the motor will work with overload. Adjusting the tilt of the engine helps to compensate for small deviations, but the baseline must be correct.
☑️ Checking the transom before buying
Capacity and passenger capacity
Many buyers mistakenly believe that if a boat is designed for 3-4 people, then a 5 hp engine will easily lead it to planing with full load. Load capacity It is the ability of a boat to stay on the water, not to speed.
For confident planing with one driver (about 80-90 kg) and minimum equipment (10-15 kg), the optimal length of the PVC boat is from 280 to 320 cm Models shorter than 270 cm will be too prowling, and longer than 340 cm will require a more powerful engine to enter mode.
If you plan to take a passenger or a dog with you, then 5 forces may not be enough to plane even on a light boat, in which case you will have to settle for a displacement mode, where the speed rarely exceeds 10-12 km / h.
To increase the speed of planing, try to move the load and passengers closer to the bow of the boat, and sit on the back jar yourself, which will help the nose to rise and easier to go to the planing.
The effect of the screw on speed and traction
The factory propeller, which comes with the engine, is not always optimal for a particular boat. Screw pitch It determines how far a boat will theoretically go in one turn. For light boats under 5 hp, it is often more profitable to replace the standard propeller with a model with a smaller pitch.
Smaller pitch allows the engine to gain speed faster and easier to get the boat to plane, although the top speed can drop a little, especially when using a boat together or in the presence of a current.
The material of the screw also matters. Aluminum screws are cheap and repairable, but when hitting a rock, they bend, losing their geometry. Plastic screws on a strong impact can just crumble, saving the gearbox, but a spare is required.
The selection of the screw is a process of experimentation. There is no universal solution that will work for all conditions. However, it is worth remembering that exceeding the maximum engine speed (usually 5500-6000 rpm) due to too small a pitch of the screw leads to rapid wear of the piston group.
Security and GIM requirements
One of the main arguments in favor of the engine up to 5 hp inclusive is the absence of the need to register a vessel in the GIMS, if its length does not exceed 3 meters, and the weight is less than 200 kg. This saves the owner from annual reports and taxes.
However, the absence of registration does not remove the responsibility for security. lifejackets In terms of the number of people on a boat, it's not just a formality, it's a necessity, and if you tip over, even in shallow water, the vest will save your life, especially if you're wearing heavy clothes or shoes.
⚠️ WARNING: Even if the law does not require a small boat fire extinguisher, its presence in a sealant can save the situation in the fire area of the fuel tank or wiring.
Weather is also important, because a small boat with a low-power engine is extremely vulnerable to wind waves, and going out into the open water in winds above 5-7 m / s on such a vessel can be life-threatening.
Safety is more important than boat performance, always have an anchor with sufficient tether and Means of rescue.
Fuel system and maintenance
5 hp engines often use built-in tanks with a volume of 1.1-1.5 liters. This is enough for 2-3 hours of active operation. For long walks, it is advisable to purchase a model with the possibility of connecting a remote tank, although this is rare for such capacities.
The quality of the gasoline-oil mixture is the key to the long life of the engine. Use only fresh AI-92 gasoline and special oils for two-stroke engines with the labeling TC-W3Old fuel that has been in the tank for more than a month can coke the carburetor and knock the engine out.
After every fishing trip, especially in salt water, the cooling system must be flushed with fresh water, and corrosion is the main enemy of low-power motors, which often lack a full-fledged rust protection system.
How to keep a boat in the winter?
The PVC boat needs to be thoroughly washed, dried and treated with talc to avoid layers clumping together, stored in a deflated but not folded in a tight roll, or suspended in an unstretched state, the motor should be preserved: drain the fuel from the carburetor, blow it out and lubricate the internal mechanisms.
Can I use an electric motor instead of a gasoline 5 hp?
An 80-100 lbs (pound) electric motor is roughly equivalent to a 3 to 4 hp petrol engine, quieter, more environmentally friendly and non-registrable, but its autonomy is limited by battery capacity and the speed is usually lower than that of an ICE.
What if the boat starts poisoning the air?
Don't panic. Find the leak site with soap solution. Use the remake that comes with the water for temporary repairs. For major repairs, you should contact the service, because improper sealing can cause the seam to break under load.
To sum up, we can say that the bundle "boat + motor 5 hp" - this is an excellent option for beginners of water engines, lovers of quiet fishing and owners of small ponds. Competent approach to the selection of components and compliance with the rules of operation will provide years of pleasant rest.