Combination PVC The 9.9 horsepower outboard motor is now considered the “gold standard” for water, fishing and hunting enthusiasts, and offers the perfect balance between mobility, speed and economy, allowing the owner to navigate the water in a comfort not available to rowing models, without requiring rights to operate a small boat in some cases. The inflatable watercraft market is huge, and choosing the right hull-motor pair requires an understanding of technical nuances.
Unlike the weaker 5-horsepower units, the 9.9 hp engine can glid even fairly heavy boats with full load, which dramatically changes the experience of driving. However, for this tandem to work effectively, many factors must be considered, from the material of the bottom of the boat to the screw mounted on the lower unit. In this article, we will discuss all aspects of the operation of such a kit.
Why 9.9? The answer lies in the design of many engines, often with 15-horsepower engines that have a technically powerful engine. power-limited This gives the user the opportunity to legally use without registration (depending on the weight of the boat) and fuel economy, while leaving the potential for modernization in the future. For many aquatic motors, this is the starting point in the world of serious bottling.
Selection of the boat: criteria and parameters
Selection of a boat for a 9.9 hp engine is not just a matter of budget, but the calculation of displacement physics. Load capacity If you plan to take two adults, a tackle and possibly a dog on board, the minimum length of the boat should be 320-340 cm. Shorter models may not be able to plane with full load, which will lead to overfueling and overheating of the engine.
Special attention should be paid to the design of the bottom. For motorization with a capacity of 9.9 hp, the optimal solution will be NDMA (low pressure inflatable floor) or hard floorboard made of aluminum. Air Deck boats may not be stiff enough to handle high speeds, which will affect seaworthiness. Hard bottoms provide better performance. hydrodynamics And stability on the wave, allowing you to keep the course more confident.
⚠️ Attention: Never exceed the maximum power of the motor specified in the transom of the boat. Installation of 9.9 hp on the boat, designed for a maximum of 5 hp, can lead to the destruction of the transom, tipping over and injury to people on board.
The material of the cylinders also plays a role. For active operation with a 9.9 hp engine, it is better to choose PVC with a density of at least 850-1100 g / sq.m. The thinner materials wear out faster from vibration and shocks to the wave. quilt - rigid lining on the bottom, which protects the boat from punctures and improves driving performance.
Motor specifications 9.9 hp
Two-stroke and four-stroke engines with a capacity of 9.9 hp have their own specifications of operation. Two-tacters They're traditionally lighter, cheaper and easier to maintain, but they require a fuel mix, and they're great for seasonal use and boats, where every kilogram of weight on a transompant matters. traction Lower revs are often higher, which is important for trolling.
Four-stroke engines, by contrast, are more economical, quieter and do not require mixing oil with gasoline. However, their weight can be significant for light inflatable boats. When choosing, you should focus on the weight of the engine: for boats up to 340 cm in length, it is desirable to keep in 25-27 kg, so as not to overload the engine. squirt-board And keep the boat balanced.
The control system is an important element. The 9.9 hp motors are the most commonly used. pump-controlRemote control (gas/shift cables) at such capacities is rare and is usually an option for specific tasks, as it complicates the design and reduces reliability.
When buying an engine, note the presence of an emergency stop system (checks). Make sure the cord checks are long enough to reach your seat in the boat, and have a bright color for visibility.
Fuel consumption and range
One of the most common questions asked by owners of kits “PVC boat + engine 9.9” concerns the issue of the “submarine”. fuel-flowThe real numbers depend on a variety of factors: boat load, propeller condition, fuel quality and driving style: On average, a two-stroke engine consumes about 300-400 grams of mixture per hour at idle speeds and up to 3.5-4.5 liters per hour at full gas.
Four-stroke counterparts in the same conditions will show lower consumption, especially at medium speeds, which are most often used to move to the fishing site. octane The gasoline must strictly comply with the manufacturer's requirements (usually AI-92 or AI-95), otherwise you can get detonation and damage to the piston group.
The range calculation requires considering not only the engine appetite, but also the tank capacity. Standard built-in tanks can hold 12-25 liters. External tanks allow you to increase the range of up to 100-150 kilometers, which is critical for fishing in large reservoirs or in river deltas. fuel-filter Between the tank and the engine is a prerequisite for a long life of the carburetor.
| Parameter | two-stroke motor | four-stroke engine |
|---|---|---|
| Flow (full gas) | 3.5 - 4.5 l/h | 2.8. - 3.5 l/h |
| Weight (average) | 25 - 28 kg | 35 - 40 kg |
| Noise | High. | Low. |
| Service | Mixing oil | Replacement of oil in the crankcase |
Speed specifications and screws
The maximum speed of a PVC boat with a 9.9 hp engine usually varies in the range of 25-35 km / h. This indicator directly depends on the pitch and diameter. propellerStandard propellers often have averaged performance that does not always allow the engine potential to be revealed on a particular boat with a specific load.
The rotor selection is a process of experimentation. If the motor doesn't spin to maximum speeds (usually 5,000-5500 rpm), then the screw is too heavy (a big step) and the engine is overloaded. If the speeds are higher than normal, the screw is too light, and you don't use the power, you just twist the motor. gelling in the shortest possible time.
What is cavitation?
Cavitation is the formation of vapor bubbles in local pressure-lowering zones on the propeller blades, and when the bubbles collapse, a shock wave occurs that destroys the screw metal and creates a characteristic noise, often when the screw is damaged or the motor is too high.
The material of the screw is also important. Aluminum screws are lighter and cheaper, but when hit by an underwater obstacle, they bend or break, saving lower unit. Stainless steel is stronger and gives a speed gain of 1-2 km / h due to better processing of the edges, but when hit, it can transfer energy to the edges. gearboxThis is fraught with expensive repairs.
Features of operation and tuning
Operation of the boat-motor bundle requires compliance with certain safety and maintenance regulations. conservation During winter, flushing the cooling system with fresh water after going into salt water and checking the tightening of the mount bolts are basic procedures that lead to breakdowns, and special attention should be paid to the condition of the lower unit for dents and corrosion.
Tuning kits often begins with installation anticavitational This simple plastic or aluminum device stabilizes the boat on the go, takes the yaw off course, and allows you to go ahead and glid earlier, and the effect is particularly noticeable on inflatable floor boats.
☑️ Checking before getting on the water
Another popular element of tuning is the installation transom-wheelFor a 9.9 hp engine that weighs almost 30 kg, the ability to roll the boat along the shore rather than drag it with a drag is a huge advantage, and many also install sonars and navigators using additional batteries, which requires competent loading to preserve the trim.
⚠️ Attention: When installing additional equipment (echo sounders, anchor winches), strictly monitor the weight distribution. Shifting the center of gravity in the nose or on board can make the boat unstable and dangerous to operate, especially in windy weather.
Legal aspects and GIMS
The issue of registration of the boat and the rights to control is often controversial. According to the legislation of the Russian Federation, registration is subject to small vessels weighing more than 200 kg. The weight of the vessel should be considered with equipment and equipment, but without fuel and passengers. PVC light boat (30-40 kg) paired with a 9.9 hp engine (25-30 kg) and equipment (10-15 kg) is often placed in the limit of 200 kg, which allows you to operate She's unregistered.
However, if the total weight exceeds 200 kg, or if the engine power exceeds 8 kW (about 10.88 hp), the right to drive becomes mandatory. Since 9.9 hp is a border value, many owners prefer to carry documents or technically limit the engine to 9.8 hp (about 7.2 kW) to avoid problems with inspectors. GIME.
Presence lifejackets The number of people on board, the anchor and the scoop are mandatory requirements of the rules of navigation, and ignoring these rules can lead not only to a fine, but also to tragic consequences on the water.
The main conclusion of the section: The set of PVC boat + engine 9.9 hp often does not require registration if the total weight of the equipped vessel does not exceed 200 kg, but the presence of rights of category "M" or "A" (depending on the year of issue) in excess of 10.88 hp is mandatory.
Do I need to register a PVC boat with a 9.9 hp engine?
Registration depends on the total mass of the boat in service. If the boat, motor, battery, anchor and equipment together weigh less than 200 kg, registration is not required. If the mass is more than 200 kg or the engine power formally exceeds 10.88 hp (8 kW), registration is mandatory. 9.9 hp engines often have a power of about 7.2 kW, which avoids registration by power, but weight remains the main criterion.
Which screw is better to choose for a boat 320 cm?
For a 320 cm boat with a 9.9 hp engine, a 5-6 inch propeller for two people on board is optimal. If you often swim alone, you can try a 7 inch propeller to achieve maximum speed. It is best to have two propellers: a "traction" for full load and a "speed" for single exits.
How many miles does a boat travel on a tank?
With a tank of 12 liters and an average flow rate of 3 liters per hour (mode 3/4 gas), the boat will go about 4 hours. At an average speed of 20 km / h, the range will be about 80 kilometers. On economical mode (third gas), the power reserve can increase to 120-140 kilometers.
Can I put the 9.9 engine on a boat under 5 hp?
It is strongly discouraged and often prohibited by the boat manufacturer, the Tran can not withstand the increased load and vibration, which will lead to its separation, and the boat will become uncontrollable in planing, the power of the engine should not exceed the maximum specified on the boat's marking plate.