A combination of an inflatable boat with a hard bottom, known as rib The Rigid Inflatable Boat, and the 9.9 horsepower outboard motor, is considered the middle ground for most water-engines, and it's the threshold where slow movement ends and full navigation begins, with the possibility of glides even with two passengers on board. RIB boat with 9.9 engine It opens up new horizons for the owner: from high-speed fishing in vast waters to family walks with comfort inaccessible to simple flat-bottomers.
Why is this power becoming the de facto standard? It's all about the legal restrictions of many countries that allow you to operate up to 10 hp without having to register with a GIM and have rights (although the rules can change, and this always needs to be checked). 9.9 hp engine. It's not just a way to get around bureaucracy, it's an engineering balance between weight, fuel consumption and traction. Unlike its 5-strong counterparts, it's a plane-confident, and unlike its 15-strong counterparts, it's economical and easy to transport.
Choosing. keelboat And you get a versatile tool with a hard fiberglass or aluminum bottom that gives you a great seaworthiness and a great wave-driven handling that you don't have inflatable floor boats. And a 9.9-strong engine that allows you to not just swim, but to overcome the oncoming current and the wind. In this article, we'll look at all the nuances of choice, the technical features and the hidden possibilities of such a bundle, so that your first or next acquisition is a source of joy, not disappointment.
Advantages of the RIB bundle and the engine 9.9 hp
The main advantage of this configuration is glitteringRIB boats are highly fluid, thanks to their V-shaped hull, and a 9.9 hp engine is enough to put a one- or two-seater boat 3.2 to 3.8 meters long on the plane, meaning you stop pushing water in front of you and start sliding along the surface, which drastically reduces fuel consumption and increases your speed from 10-12 km/h to 30-35 km/h.
The second important aspect is loading capacity Many 9.9 hp models are structurally identical to 15 hp units (often the same model with different jigs or software limitations), which offers huge potential for tuning in the future. RIBs also tend to have greater payload capacity than similar PVC boats, allowing more equipment, fuel and passengers to be carried without critical loss of speed.
⚠️ Note: Not all RIB boats behave the same for an outboard motor 9.9 hp Models of length less than 3 meters can be prone to " yaw" on the planing due to the short waterline.
Also worth noting is reliability and maintainability. The two-stroke and modern four-stroke engines in this class are time-tested designs. They are lighter than the 15-horsepower versions, which is critical when you launch a boat from a flat shore by hand. The total weight of the kit (boat + motor + equipment) often allows you to use one transom wheeled wheeled course or even carry components in weight separately.
Criteria for the selection of an inflatable keel boat (RIB)
When choosing a body for the engine 9.9 hp. you need to pay attention not only to the length, but also to the design. transom and keelTrain must be strengthened, as the plane load on it increases many times. for the engine 9.9 hp is optimal height of the transom 381 mm (standard S). It is important that the transom had the correct angle of keeliness, otherwise the boat will pick up nose or, conversely, to dig water.
The cylinder material also plays a role. For RIBs, the most commonly used five-layer reinforced PVC fabric is a density of 750 to 1100 g/sq.m. The denser fabric increases weight, but increases durability and abrasion resistance against rocky shore. Inflatable keel cylinders (if there are on the sides) improve seaworthiness, softening the blows against the wave, but adding sailing.
Pay attention to the location stringer And the floorboard attachment system (if the bottom is prefabricated) or the monolithicity of the infused bottom. In RIBs, the bottom is infused, which excludes the shifting of the center of gravity. But it is important to check the quality of the transpanel sticker. Also critical is the size of the cockpit: narrow RIBs are faster but less stable in the parking lot, wide ones are more comfortable for fishing, but require more power to go out to the plane.
Here are the main parameters that should be looked at in the specifications:
- 📏 Length: Optimally 3.20 - 3.60 meters for the engine 9.9 hp.
- ⚖️ Load capacity: The total weight of the crew and equipment must be at least 30% higher.
- 🌊 Kieling: Deep keel (12-15 degrees) cuts the wave better, small - more stable at low speeds.
Choice of motor: two-stroke or four-stroke?
The choice of engine type for ribboat Two-stroke (2T) engines are traditionally cheaper, easier and easier to maintain. They can work in any position, which is important for tilts during transportation. However, they require a mixture of gasoline and oil, noisier and more environmentally dirty. For a 9.9 hp engine, the 2T weight is about 26-28 kg.
The 4Ts in the 9.9 hp class weigh about 36-40 kg. They are quieter, 20 to 30 percent more fuel efficient and do not require fuel mixing. For fishermen who stay at anchor for hours or troll slowly, the 4T is the ideal choice because of its stable operation at low speeds.
An important parameter is gear ratio. For RIBs that have a heavier hull than light PVC boats, a gearbox with a larger gear ratio is preferred (for example, 2.08:1 vs. 1.85:1). This gives more propeller traction, allowing you to confidently go to plane with a full load. The propeller It is also worth selecting experimentally: the screw's pitch affects the maximum speed and ability to go into mode.
Technical specifications and comparison of models
To understand which RIB boat with 9.9 engine So if you're right for this, let's compare the averages of popular configurations, and the performance difference can be significant depending on the shape of the hull and the weight of the boat.
| Parameter | RIB 3.20 m + 9.9 hp (2T) | RIB 3.60 m + 9.9 hp (4T) | Ploskonok 3.2 m + 9.9 hp |
|---|---|---|---|
| Max. speed (1 person) | 32-34 km/h | 30-32 km/h | 28-30 km/h |
| Fuel consumption (average) | 3.5 l/hour | 2.8 l/hour | 3.2 l/hour |
| Time to go out to plane | 4-5 seconds | 6-7 seconds | 8-10 seconds |
| Comfort on the wave | Highly | Very tall. | Low. |
The table shows that increasing the length of the RIB from 3.2 to 3.6 meters when using a heavier four-stroke engine practically does not reduce speed indicators, but significantly increases comfort and safety. Flatboats, even equipped with a powerful motor, lose to RIBs in seaworthiness, since they do not have a V-shaped bottom that extinguishes the impacts.
When choosing, consider the length of the lower unit. Standard shaft (S - 381 mm) is suitable for most RIBs. However, if the boat's transom has a specific design or you plan to put an anti-cavitation slab, a long shaft (L - 508 mm) may be required, although for 9.9 hp this is rare. Always check compatibility. Mounting Height (heights of installation) of the motor and transom of the boat.
Operation and safety on water
Ligament management RIB + 9.9 hp It requires an understanding of the behavior of a rigid bottom inflatable hull, which at high speeds becomes very sensitive to the movement of cargo, and the displacement of a passenger on board can cause a sharp roll and even rollover, since the inflatable sides are softer than the metal or fiberglass board.
⚠️ Warning: Never exceed the maximum power of the engine specified in the boat data sheet. Installing the engine 15 hp on the RIB, designed for 9.9 hp, can lead to the destruction of the transom and flooding the boat at full speed.
Pay special attention to the fastening of the motor. Use the safety cable, run through the bolt on the transom. Vibrations from the operation of the engine, especially two-stroke, can gradually weaken the rods. Regular check of puffs is a mandatory procedure before each step on the water. attachment of the "dead loop" (cheques) to the driver's clothes.
☑️ Checking before getting on the water
RIBs behave predictably, but have one feature: they can jump when weight is misallocated or the nose is too sharp. If the boat starts to throw from side to side (sniff), try to shift the weight forward or lower the motor slightly (within reason), changing the angle of attack.
Maintenance and preparation for winter storage
Your durability ribboat After each operation, especially in salt water, the motor must be washed with fresh water, and special nozzles are placed on the intake hole, and washing prevents corrosion of the cooling system and thermostat.
The boat also needs to be washed and dried. The sand and dirt left on the PVC fabric acts as an abrasive when rolled up, rubbing the fibers. Before packing, make sure the boat is completely dry to avoid mold and unpleasant odor. The engine oil in the two-stroke engine for the winter is better drained or preserved with oil for storage.
It is better to store RIB inflated or semi-assembled, in a horizontal position, in a room with a temperature of -10 to +30 degrees. Direct sunlight destroys PVC, so the canopy or garage is mandatory. Store the motor strictly in an upright position to avoid condensation entering the carburetor or cylinders.
Frequently Asked Questions (FAQ)
Is it true that the engine 9.9 hp can be suffocated to 15 hp?
Manufacturers (especially Yamaha, Tohatsu, Mercury) often use a single cylinder block for the 9.9 and 15 hp models. Power limitation is achieved by replacing the jeeler carburetor or flashing the electronic unit (CDI). modernization It should be carried out by a professional, as improper setting can lead to overheating of the engine and loss of warranty.
Which screw is better to choose for a 3.4 meter full load RIB?
To go to the plane with a full load (2 people + equipment) on a boat RIB length of 3.4 meters better fit screw with a smaller pitch (for example, 8-9 inches instead of the standard 10). This will increase traction at low revs. If you swim alone, you can put a screw with a large pitch for maximum speed.
Do I need to register a RIB boat with a 9.9 hp engine?
According to the current legislation of the Russian Federation (and a number of other countries), boats weighing more than 200 kg are subject to registration. fitted OR with an engine of more than 8 kW (10.88 hp) Since 9.9 hp is about 7.3 kW, registration is not required by power. However, if the weight of the boat with installed equipment (anchor, tank, life jackets) exceeds 200 kg, registration is required, regardless of the power of the engine.
Can I use an electric motor on a RIB?
Yes, but with limitations. RIBs are heavier than boats with NDL, so you need an electric motor with a thrust of at least 50-60 lbs (pounds) to move comfortably. Electric motors are not yet powerful enough to plane, so the RIB will go in displacement mode at a speed of 5-7 km / h.