Choosing a 360 cm inflatable power unit is a challenge that requires a careful approach, because it is the solution that determines the safety, comfort and economy of your voyages. A boat of this size is a versatile platform: it is large enough for trophy fishing with two or three passengers, but still retains mobility for transport in the trunk of a passenger car. Mistake in choosing power or engine type can turn rest into a complete disappointment, whether it is the inability to go glising with a full load or excessive fuel consumption.
The modern market offers many options, from low-end Chinese models to premium Japanese brands, and it can be difficult to understand the technical details without preparation. You need to consider not only the declared power, but also the length of the lower unit, the weight of the engine, the ignition system and the type of cooling. In this article, we will discuss in detail all aspects that will help you make the final decision and choose the perfect one. outboard It's for your boat.
Optimum engine power for the body 3.6 metersThe question of how much power should develop an engine for a PVC boat with a length of 3.6 meters, is one of the most discussed in thematic forums. For such hulls, which are usually about 150-160 cm wide and have a kielson design, the golden mean is considered to be the range from 9.9 to 15 horsepower. Lesser engines, for example, 5-6 hp, can also be used, but they will not allow the vessel to be glided when fully loaded by a fisher, equipment and fuel.
If you plan to use the boat mainly alone or with one passenger, then the 9.9 hp unit will be enough for confident glides. However, for family exits or active fishing with heavy equipment (echo sounder, anchor, tent) it is better to focus on the water. 15-strong models.
Two-stroke or four-stroke: the eternal dilemmaThe choice between a two-stroke (2T) and a four-stroke (4T) engine is a trade-off between weight, fuel consumption and maintenance costs. Two-stroke engines are traditionally lighter than their four-stroke counterparts of the same power, which is critical for inflatable boats where every extra kilogram affects stability and speed. In addition, 2T engines are less whimsical to transport and can be carried in any position, whereas 4T require strictly vertical storage due to the presence of oil in the crankcase.
On the other hand, four-stroke units are much quieter, do not require preparation of the fuel mixture (gasoline and oil are poured separately), and consume 20-30% less fuel. eco-friendliness And the lack of exhaust odor, which is always present in 2T engines, so if you're planning long transitions or multi-day expeditions, the fuel economy and reliability of a 4T engine outweigh the weight.
- 🚤 Weight: 2T motors are 30-40% lighter, which makes it easier to install on a transom.
- ⛽ Expenditure: 4T engines are more economical and do not require mixing oil with gasoline.
- 🔊 Noise: Four-strokes work quieter and softer, which is important for fishing.
- 💰 Price: The initial cost of 2T models is usually lower.
⚠️ Note: When using a two-stroke engine, strictly observe the ratios of mixing oil and gasoline specified in the instructions. Using poor-quality oil or violation of proportions will lead to a rapid failure of the piston group.
Selection criteria: lower unit, weight and managementIn addition to power and tact, the critical parameter is the length of the lower unit (legs). S (Short), which is usually 381 mm (15 inches) Installation of a long-dadewood motor (Short)L 508 mm) per inflatable boat will lead to excessive immersion of the propeller, increased water resistance and, as a result, loss of speed and increased fuel consumption.
Motor weight is also key, especially if you often change outboard motors or drag them along the shore without a cart. Modern models are made lighter by using composite materials and aluminum alloys. When choosing, pay attention to the control system: the control control control control is convenient for low power, but for motors from 15 hp and above, especially four-stroke, may be preferable to remote control. remote-gas And a tiller gas, which allows you to control one hand.
Buying a motor, immediately buy a trolley-roller for transportation along the shore. Even a "light" engine weighing 25 kg to carry on your hands on sand or stones is very difficult and inconvenient.
Overview of popular models of boats 360 cmThe outboard market is full of offers, but for boats of this size, a stable circle of leaders has developed, which has proven itself to be reliable. Tohatsu M9.8B and Yamaha 9.9FMHSIt is a time-tested classic, which is characterized by high repairability and availability of spare parts in any service center.
In the segment of four-stroke engines, it is worth paying attention to the Yamaha F9.9 and Honda BF10These models have excellent traction at low revs, which is important for trolling, and very low noise levels. Hidea or ParsunThey offer a more affordable alternative, often being copies of proven Japanese developments, but requiring more thorough testing.
| Model | Type | Power (hp) | Weight (kg) | Features |
|---|---|---|---|---|
| Tohatsu M9.8B | 2T | 9.8 | 26 | Legendary reliability, light weight |
| Yamaha 9.9FMHS | 2T | 9.9 | 27 | Electronic ignition, traction |
| Yamaha F9.9 | 4T | 9.9 | 37 | Quiet, economical, without mixing oil |
| Hidea HD9.8 | 2T | 9.8 | 26 | Budgetary analogue of Tohatsu |
For a 360 cm boat, the best choice in terms of price / quality / weight ratio is a two-stroke engine with a capacity of 9.8-9.9 hp from the proven brand.
planing and screw pairingFor your PVC 360 boat to go sleeve, it's not enough just a powerful engine. The rotor is critical. Standard screws that come with engines often have a medium-load pitch. If the boat is loaded, a standard propeller may not spin the engine to working speed, and glides will not occur. In such cases, you need to replace the screw with a model with a smaller pitch.
For two-stroke engines on boats 360 cm often recommend screws with a pitch of 9-10 inches instead of the standard 11-12. This will allow the engine to gain speed more easily and more confidently put the vessel into planing mode even with full load. It is also worth checking the condition of the anti-cavitation plate: it should be located parallel to the bottom of the boat or be slightly higher, but not lower, to avoid excessive drag.
What is cavitation?
Cavitation is the formation of vapor bubbles in the fluid stream caused by a local pressure drop, which manifests itself on the propeller as "air capture," a sharp loss of traction and characteristic noise, often when the screw is damaged or the engine is not installed correctly.
Installation and safety of operationThe correct installation of the motor on the transom is the key to safety and durability of the equipment. The motor must be fixed strictly in the center of the transom, the height of the installation is adjusted so that the anti-cavitation plate is 0-25 mm below the bottom of the boat when going to the planing. Too deep landing will lead to loss of speed, and too high will lead to air capture by the screw.
Pay special attention to insurance. The use of a safety flap that fastens the motor to the transom is a mandatory safety requirement. In the case of vibration or impact on a buoy, the fasteners can weaken, and without insurance, the motor can fall overboard along with part of the transom. Also, remember the engine emergency shutdown check ("death button"), which must be fixed on the driver's clothes.
☑️ Checking before getting on the water
⚠️ Warning: Never start the motor out of the water (even for a few seconds) without connecting to a water tank or a special cap. This is guaranteed to overheat and deform the impeller pump, as water cooling will not work.
Frequently Asked Questions (FAQ)
Can I put the engine 15 hp on the PVC boat 360 with a transom under 10 hp?
Technically, you can set it if the size of the anchorage is the same, but this can lead to an excess of the permissible load on the transom, which is dangerous for the integrity of the boat, and the boat can become unstable on the go, and it is recommended to comply with the restrictions of the boat manufacturer.
What kind of gasoline is best used for these engines?
For modern 2T and 4T engines, it is recommended to use unleaded gasoline with an octane number of at least AI-92. The use of AI-95 is allowed, but is not mandatory and may even be harmful for some carburetor models due to different additives.
How often should I change the oil in a 4T engine?
The first oil change after running (the first 10 hours) is mandatory, and then regular replacement is made every 50-100 hours or once a season, depending on the intensity of operation and the recommendations of the specific manufacturer.
Why does the engine stop at high speeds?
Most often, the cause lies in poor quality fuel, contaminated fuel filter or carburetor jetties, and the problem may be incorrect setting of the angle of ignition or the presence of water in the fuel system.