Modern water element dictates its rules, and classic keel boats are gradually giving way to more versatile and sustainable solutions. Inflatable catamaran with motor Now, it's no longer exotic for a small group of enthusiasts, becoming a reliable vehicle for fishing, diving and family recreation. The two-hull design provides a unique stability that can't be obtained on a monohull, allowing passengers to safely navigate the deck even in intense excitement.
The main advantage of this technology is the combination of ease of transportation and high load capacity. balloon You can blow it off and pack it in the trunk of a car, which solves the storage and transportation problem, but choosing the right model requires a deep understanding of hydrodynamics, materials and specifications. boat-enginewhich will be used in conjunction with this boat.
Many beginners make the mistake of buying the first option they come across without thinking about the compatibility of the transom and the engine. catamaran Not only must it withstand the weight of the crew, it must also effectively resist wind drift while maintaining course stability. In this article, we will examine in detail all aspects, from the choice of PVC fabric to the intricacies of controlling a two-hull at full speed.
Design features of inflatable catamarans
The structure is based on two parallel cylinders connected by a rigid or inflatable deck, which acts as a deck. clearanceThe wider the hulls, the harder it is to turn a boat over, which is critical when fishing while standing or doing underwater work.
The material for production is most often reinforced PVC fabric It's made up of several layers of polyvinyl chloride, and it's got a synthetic grid that gives you tensile strength. catamaran It should have a tissue density of at least 750-900 g / sq.m., which guarantees resistance to punctures and ultraviet radiation.
An important element is the system of connecting cylinders to the deck. Budget models use the gluing method, while professional series are equipped with mechanical mounts made of stainless steel or aluminum, which allows you to quickly replace a damaged cylinder or transform a vessel for the transport of large cargo.
⚠️ Warning: Never leave a fully inflated catamaran under direct sunlight unattended. The air pressure in the cylinders increases proportionally to the temperature, which can lead to rupture of the seams or deformation of the structure.
It's worth noting that the shape of the nose of the cylinders directly affects the performance of the wheels, pointed noses better dissect the wave, providing a softer ride, while blunt noses increase the usable area of the deck, but create additional sailing and water resistance.
Criteria for choosing a model for the motor
When planning a purchase, you need to clearly define for what purposes the boat will be used. For quiet fishing in closed water bodies, stability and deck area are the priority, whereas for outdoor water or sea walks, it is critically important to go out into the open water or go for sea. seaworthiness and the height of the cylinders.
The key is the load capacity, which is specified by the manufacturer, but it's worth remembering that the actual payload is always less than the passport one if you want to maintain good driving performance. catamaran Loses speed, is less controlled and becomes dangerous to the crew.
Special attention should be paid to the type of bottom: low-pressure inflatable floor (LDPB) provides excellent comfort and protection from cold splashes, but creates great resistance when glides. Hard solder floor made of plywood or aluminum allows higher speeds, but increases the weight assembled and the time of preparation for descent.
Transportability also plays a role: models with inflatable decks weigh significantly less and fold more compactly, but require more careful care of the floor surface. If you plan to often carry a boat alone, the weight of the kit should not exceed 40-50 kg.
Installation of the transcen and selection of engine power
Inflatable catamarans, unlike classic boats, do not have a built-in rigid transom, so the engine is removable, they can be attached directly to cylinders through special pockets or to elements of a rigid frame. transom Safety is a concern, as the motor is the heaviest piece of equipment.
The engine power must be strictly in line with the manufacturer's recommendations; if an engine is too powerful, it can cause the fasteners to break down or even the transom to break off, and the optimum power is calculated based on displacement and desired speed.
For most recreational models, electric motors or gasoline engines with a capacity of 2 to 5 hp are the best choice. More powerful units require enhanced transom and experienced control, since the two-hull scheme has its own specifications in the behavior of planing.
☑️ Check before installing the engine
It is important to consider the lower unit motor. Catamarans often require engines with an elongated lower unit, since the distance from the mounting of the transom to the surface of the water can be longer than that of conventional boats due to the design of the deck and the height of the sides.
specifications comparison table
To organize the data and simplify the selection, we compare popular types of inflatable catamaran configurations, which are averaged for mid-range models.
| Parameter | Fisherman-2 (NDM) model | The Profi-4 model (Pyol) | Model "Expedition" (Aluminum) |
|---|---|---|---|
| Length, m | 3.20 | 4.10 | 4.50 |
| Width, m. | 1.60 | 2.00 | 2.20 |
| Load capacity, kg | 450 | 800 | 1200 |
| Max, engine power, hp. | 5 | 9.9 | 15 |
| Kit weight, kg | 35 | 65 | 85 |
As you can see from the table, the increase in size and load capacity directly affects the weight of the kit and the required engine power, and the choice of a particular model should be based on the balance between the need to transport large quantities of equipment and the ability to transport the boat to the water.
The effect of width on speed
Increasing the width of the catamaran over 2 meters at the same power of the engine can lead to a drop in the maximum speed by 15-20% due to increased water resistance and sailing.
Equipment and navigation equipment
Comfort and safety on the water depend not only on the body, but also on the correct equipment. Inflatable catamaran This is a unique opportunity to install additional equipment that is not available on narrow boats, and on a spacious deck you can attach a sonar, a navigator, an anchor winch and even a small table for cutting the catch.
To install electronics, it is recommended to use special racks or brackets that are attached to stringers or sides. It is important to ensure tight connections and protection against splashes, since salt water and constant humidity quickly disable unprotected devices.
The anchor system is special, because of the low draught and the large sailing, catamarans drift very much even in low winds, and using a cat anchor or Hall anchor with sufficient chain weight allows them to anchor effectively even on the current.
Personal protective equipment is also a must; life jackets, a line and a first aid kit are a must; night fishing or twilight navigation lights must be fitted to the WFPSS rules.
⚠️ Warning: When installing heavy batteries for electric motors, place them strictly in the center of the deck or symmetrically relative to the diametrical plane, so as not to disturb the trim and stability of the vessel.
Control and maneuvering on water
The two-hulled vessel has its own peculiarities, especially when it's going against a wave. The catamaran does not tilt onto the board, but sinks the whole body into the water, which can lead to shocks against the wave and splashing the deck. Experienced drivers recommend cruising a little at an angle to the wave to soften the impacts.
At full speed, it is important to monitor the weight distribution of passengers. Shifting the cargo to one side can cause one cylinder to sink deeper, creating resistance and taking the boat aside, and the helmsman must constantly monitor the balancing.
When cornering at high speed, sharp movements with the tiller should be avoided. The dual-hull circuit has high inertia, and a sharp reversal can cause overkill (tilting) or loss of control.
Tip: When you're driving against strong winds and waves, slow down and make sure the bow doesn't burrow into the water. If the deck starts flooding, you'd better turn around and lag towards the wave or change course.
Braking on the water is only due to the resistance of the water, so always leave a margin of distance to obstacles. Remember that the inertia of a laden catamaran is much higher than that of a light inflatable boat.
Rules of operation and storage
Your durability cockroach After each release, especially in a salty environment, you need to thoroughly wash the product with fresh water, and the salt, sand and silt act as an abrasive, gradually destroying the protective layer of PVC.
Drying should be done in the shade, in the straightened form, packaging wet products guaranteed to cause mold and decay of the fabric, which will dramatically reduce the strength of the seams. If you can not completely dry the boat, keep it in a half-deflated state until completely dry.
Use special bags or covers to protect against dust and rodents, optimal storage temperature is from +5 to +25 degrees Celsius, sharp temperature changes and storage in the cold make the material fragile.
Check the cylinder pressure and valve condition regularly, and the use of a pressure gauge will maintain the optimum pressure specified in the instructions, which will prolong the service life of the seams and ensure the design performance.
Proper drying and storage away from direct sunlight and heating appliances is a guarantee that your catamaran will last more than 10 years without losing its tightness.
Frequently Asked Questions (FAQ)
Can I install on an inflatable catamaran engine with a capacity of more than 10 hp?
Technically, this is only possible on models with a reinforced transom and a corresponding load capacity. However, manufacturers rarely certify inflatable catamarans for engines more powerful than 10-15 hp, because of the risk of structural failure. Exceeding the recommended power removes the warranty and poses a safety risk.
What speed does an inflatable catamaran with a 5 hp engine develop?
The average speed will be about 10-15 km/h in displacement mode, and the plane with such a motor is possible only on light models with one passenger and a hard bottom. Heavy expedition models with a 5 hp engine will move exclusively in displacement mode.
Do I need to register an inflatable catamaran in GIMS?
Registration is required if the weight of the curbed vessel exceeds 200 kg OR the power of the installed engine exceeds 8 kW (about 10.8 hp). If your catamaran is lighter than 200 kg and the engine is weaker than 10 hp, registration is not required, but you need to have documents for the boat and the engine with you.
What is dangerous to go out on a catamaran in open water?
The main danger is high sailing and low draught. In strong side winds, the catamaran can quickly derail, and when faced with a large tail wave, there is a risk of losing control or flooding the deck if the speed is chosen incorrectly.