Modern inflatable boats have come a long way from simple rowing mattresses to high-tech vessels capable of carrying powerful outboard motors and overcoming serious excitement. Rubber motorboats Today, they are a complex engineering product, where each seam and valve is designed for extreme loads, and unlike classical rowing models, the key element here is the rigidity of the structure provided by the inflatable floor or hard slate.
Why are so many water-powered cars still choosing to do this? PVC The answer lies in versatility and maintainability. The ease of transport in the trunk of a passenger car allows you to go fishing or cruising in any body of water without having to apply for a trailer. However, when you buy a motorized boat, you need to clearly understand the difference between just an inflatable boat and a full-fledged vessel ready to be installed. hanger-engine.
In this article, we will discuss the technical nuances that will help you not to make mistakes when choosing, and consider the hidden aspects of operation, which are not discussed in stores, you will learn how to choose the right power of the engine and why the weight of the boat assembled often becomes an unpleasant surprise to the owner.
Design features of boats for an outboard motor
The main difference is the presence of a reinforced transom, which is a rigid plate mounted in the aft cylinder or between cylinders, which takes over all the engine thrust and vibration. transom board It's usually made of laminated plywood, waterproof paint, or composite materials, and it's the quality of the transom's attachment that determines the safety of the crew, because if it breaks down, the motor can go down with part of the boat.
The second critical element is the type of bottom, and for motorboats, two options are most commonly used: NDMA (low pressure inflatable floor) or hard floorboard (plywood/aluminum) The inflatable floor provides excellent germination and comfort, as the cylinders work as shock absorbers, but it is less resistant to punctures on stones. The hard floor creates a level ground, improving driving performance and allowing you to stand on your feet more confidently while fishing.
What's the secret to the shape of the cylinders?
Motorboat cylinders often have more complex geometry than rowing ones. The presence of hulls (strips of fabric along the side) not only protects the board from abrasion, but also forms a kind of “comb” that throws the spray aside, improving visibility and keeping the contents of the cockpit dry.
It is important to consider the availability quilt It's a longitudinal stiffness element that runs along the entire length of the bottom, which prevents the boat from deforming when it's moving on a plane, and without a quilt or a quality stringer, the structure can fold into a house under load, which will lead to loss of handling.
Selection criteria: dimension and load capacity
When choosing the size of the boat, many beginners make the mistake of focusing only on the number of passengers. loading capacityIt's a 400 kg passport load capacity, which doesn't mean you can load 350 kg of people and 50 kg of motor, but you have to have a safety margin.
Boats up to 3 meters long are suitable for calm water bodies and engines up to 5 hp. They are easy to control alone, but on the wave they start to "slap" and splash. Models from 3.2 to 3.6 meters are a "middle ground" for two anglers with a 9.9 hp engine. Here you can already go out into the open water and feel confident in the wind.
The width of the cockpit is another parameter that is often overlooked. Narrow boats (Narrow boats)less than 130 cm) have better speeds, but they are unstable when landing and disembarking, especially in motion; wide models provide comfort, but require a more powerful motor to get on plane; balance between speed and stability is a key task in the choice.
Materials: PVC against rubber and hypalon
The word "rubber" in the title of the article is more of a tribute to tradition. Modern boats are made of reinforced polyvinyl chloride (PVC)It's a five-layer material, where you have a polyester mesh between the PVC layers, which provides tensile strength, and unlike older rubber, PVC is not afraid of gasoline, oils and ultraviolet light, and it's also easier to glue in the field.
For extreme conditions, there are boats from Hypalon This is a premium material that is significantly stronger than PVC, resistant to abrasion against sand and rocks, and withstands higher operating temperatures. However, the cost of boats made of hypalon can be 2-3 times higher, and their repair requires special skills and glue, so for most amateur anglers, high-quality dense PVC (density from 850 g / sq.m) is the best choice.
When buying, pay attention to the density of the fabric in the product passport. Figures like “750 g / sq.m” or “1100 g / sq.m” indicate the weight of one square meter of material. For motor boats, it is not recommended to take fabric with a density below 850 g / sq.m., as vibration and water pressure will quickly destroy the weak structure.
Seams are the weakest part of any inflatable structure, and there are two basic methods of joining together: gluing and welding. Stitched together (overlapping) are considered more reliable and maintainable, because the glue penetrates the fabric structure, creating a monolith. Welds (heating) faster in production, but when overheated can become brittle. When choosing a boat, carefully examine the quality of the processing of the seams: there should be no bubbles, non-progly or protruding threads.
Selection of motor group
Choosing an engine for an inflatable boat is about finding a compromise between power and weight. Two-stroke engines PVC boats are traditionally popular among owners because of their lightness, ability to transport in any position and high power density. They are easier to maintain and cheaper, which is critical for seasonal use.
However, four-stroke They're gaining popularity because of their efficiency, quiet operation and lack of need to mix gasoline with oil, and the main disadvantage is weight. A heavy motor on the transom of a light inflatable boat can disrupt the differentiation by lifting the nose too high, which will impair visibility and handling, in which cases it may be necessary to install a remote tank or use a longer tiller.
When installing the engine, you need to carefully monitor the height of the lower unit. If the engine is too high in water, you will increase the risk of cavitation (steer capture), especially when cornering; if it is too low, water resistance will increase; the optimal position of the anti-cavitation plate is in the same plane with the bottom of the boat or slightly lower.
☑️ Check before the first launch
Don't forget. lower unit Inflatable boats are usually short-dadewood (S) engines, because the transom height is standardized, and the long-legged motor requires transom build-up, which is not always safe and justifiable.
Comparison of popular bottom types
To make a final decision, let’s compare the main types of bottom used in modern motorboats, each with its own advantages for different use cases.
| Type of bottom | Weight and assembly | Driving performance | Comfort. |
|---|---|---|---|
| Slate book | Heavy, assembly 10-15 minutes. | Great germination on the wave, holds plane | Tall, you can stand. |
| NDMA (Inflatable) | Easy, quick assembly. | Worse rises on the wave, higher fuel consumption | Mildly, but less steady |
| Plywood plywood | Medium weight, complex assembly | Good speed, but hard hit on the wave | Hard, cold from the water. |
As you can see from the table, slate-book It often benefits from a combination of specifications for medium-sized motorboats, which provides the necessary rigidity for planing, but retains some flexibility, and it is chosen by those who value minimal weight and are willing to put up with slightly worse seaworthiness.
Safety and service at sea
Operating an inflatable boat for an outboard motor requires special safety regulations. The main danger is the loss of buoyancy of one of the compartments. Modern boats have at least two, and often three or four independent inflatable compartments. Even if one side is penetrated, the boat must remain afloat, but its handling will deteriorate dramatically.
⚠️ Attention: Never use an inflatable boat without life jackets on all passengers. Unlike hard-hull boats, an inflatable boat can quickly lose shape in a serious accident, and staying on its slippery sides in the water will be extremely difficult.
Regular maintenance includes checking the pressure in the cylinders. Pressure. The boat must comply with the manufacturer's recommendations (usually 0.2-0.25 atm for main cylinders and up to 0.4 atm for NDNDT). A subpumped boat wears out faster on the wave, and a pumped in the sun can simply burst due to air expansion.
After each operation, be sure to wash the boat with fresh water, especially if you have been swimming in salt water or dirty pond. The sand and salt act as an abrasive, destroying the protective layer of PVC, and organics can cause mold to appear in the folds.
Keeping the boat straightened or loosely rolled up, but not tightly wrapped, especially in a warm room, will prevent cloth from forming, which eventually turn into cracks, and the motor also requires preservation for the winter: fuel discharge, candle treatment and corrosion protection.
Frequently Asked Questions (FAQ)
Can the engine be more powerful than the manufacturer recommends?
It is strongly recommended not to exceed the maximum power specified in the data sheet, this can lead to the collapse of the transom, the tipping of the boat due to too high aperture or even to rupture of the seams of the stern cylinder from the generated wave. The boat is designed with a certain margin of safety, and exceeding it endangers the life of the crew.
How to properly seal the boat in the field?
For emergency repairs, use the remix kit that comes with the kit. The surface should be dry and fat-free. Apply the glue on both surfaces, let it dry (usually 10-15 minutes), then apply the second layer and tightly press the patch. Full polymerization takes up to 24 hours, but will start to hold immediately. It is important to use a material-compatible adhesive (PVC or rubber).
Why doesn't the boat go out for glides with a full tank?
It's probably a broken center. A heavy motor and a full tank of fuel in the stern push the boat upwards, increasing the water resistance area. Try to move the passenger or the loads closer to the nose. Also check the angle of tilt of the lower unit (different angle) - maybe the engine is too "stuck" up.
How long are PVC boats?
When properly operated and stored, a high-quality PVC reinforced boat lasts 10-15 years or more. The main enemies of the material are ultraviolet (drying and brittleness) and improper storage (mold, clogs); Regular treatment with special compounds (such as "liquid PVC") can prolong the life of aging tissue.