Choosing a swimming aid for fishing or a family holiday on the water often becomes a difficult dilemma, especially when it comes to inflatable structures. catamaran-type boatIt combines the stability of the catamaran and the ease of assembly of classic inflatable models, a hybrid designed for those who are not willing to put up with constantly flipping on the wave, but do not want to carry a heavy metal body.
The main feature of these vessels is their unique bottom geometry, and unlike the usual bubbles with an inflatable keel, here we see two parallel cylinders connected by a rigid or inflatable floor, which creates a double hull effect. High pressure inflatable floor (NDM) provides excellent rigidity, allowing for a solid speed, and a wide base ensures that the angler remains dry even when the center of gravity is sharply shifted, which is the combination that makes such boats ideal for anchoring or casting.
You should consider this type of boat if you plan to go out in windy weather or often fish with a partner. The design is originally designed to minimize the onboard rolling, which is critical for comfortable spinning fishing. In addition, modern materials allow you to create really durable products that are not afraid of sharp stones, snags, or scorching sun when properly cared for.
Design features and advantages of the catamaran scheme
The fundamental difference between this scheme and the classic mono-shaft boat is the distribution of displacement. Two spaced cylinders create a wide support pad, which radically changes the behavior of the vessel on the water. catamaran This is achieved by the fact that the metacentric height of such a vessel is much higher than that of narrow counterparts.
Use of use NDMA In conjunction with this geometry, the floor is hard, without heavy plywood floorboards, stretched between the cylinders to form a single working platform, some models have a rigid transombing board or stringers installed between the cylinders, which further enhances the design, allowing for more powerful motors to be installed without fear of deformation of the stern.
Notice the valves on the cylinders. In catamaran boats, they are often shifted to the sides, which makes it easier to pump, but requires care when installing an awning or a running bridge.
But there's a flip side to this medal that you can't keep quiet about, and the wide hull has a very high sailing effect. Wind load The boats are much higher than those of a narrow boat, which requires a more careful choice of anchor system. If a narrow boat can do with a light anchor, then it will require more serious equipment to hold a wide catamaran at a point in a strong squall. It is also worth considering that the width in the folded form of such models is often larger, which can create problems when transporting in the trunk of a compact car.
- 🚤 High initial stability allows you to safely stand up in full growth even on the wave.
- ⚓ The ideal platform for fishing in the throw due to the absence of rolls when throwing tackle.
- 🛡️ Increased safety: even if one cylinder is completely damaged, the second one remains buoyant.
- 🏗️ The hard bottom of the NDND eliminates deflections and provides comfortable placement of equipment.
Comparison: keel-versus-catamaran NDND boat
When choosing between a classic keel boat and a catamaran, many anglers are guided by habit or advice from acquaintances. However, technical comparison shows that these types of vessels solve different tasks.NDMA) is geared towards speed and the ability to cut the wave with the nose. The keel breaks the oncoming wave, providing a soft ride, but in the parking lot, such a boat becomes a toy in the hands of the wind.
In turn, catamaran It's a slowdown in plane speed because of the broad midline and the greater resistance of the water, and it's a calm water, a large reservoir with a short wave, or a river with a moderate current, where stability is important. If you want to move quickly from shore to the catching point and then stay at anchor for hours, the catamaran will give you a head start to any keel model for the comfort of being inside the cockpit.
The Secret to Sustainability
Why doesn't the catamaran flip?: The physical principle is simple: the width of the catamaran base creates a huge recovery moment. To flip a boat like this, you need to apply a force that is disproportionate to the weight of one or even two people. Unlike a keel boat, where the center of gravity shifts relatively narrow support, the catamaran has a support distributed to the maximum width.
It's also important to note the differences in handling: a narrow keel boat is more maneuverable at high speeds, it's easier to get into corners. catamaran It has a larger turning radius and requires earlier manoeuvring. At high speeds, wide cheekbones can cause yaw if the motor is not powerful enough to quickly output to the plane. Therefore, when choosing a motor for a catamaran, it is often recommended to take a power reserve to compensate for hydrodynamic drag.
Below is a comparison table that will help you organize information and make the right choice based on your priorities.
| Characterization | Boat with inflatable keel (BNPD) | Catamaran-type boat (BDND) | Boat with sleigh (flat bottom) |
|---|---|---|---|
| Parking stability | Medium (requires balancing) | Great (you can get up) | Low (highly rolling) |
| Gleaming speed | High (early exit) | Medium (power required) | Low (late exit) |
| Wave behavior | Cutting the wave, soft stroke | Soaring above the wave, possible shaking | Hard hit on the wave |
| Sailing | Moderate. | Tall (requires anchor) | Medium |
| Weight gathered | Medium. | High (more material) | Low. |
Materials and production technologies
Quality and durability of any inflatable boat, including catamaranThe absolute market leader is PVC reinforced (polyvinyl chloride), which is not just a film, but a complex composite made of several layers. The basis is a polyester framework (lausan thread), which provides tensile strength and limits tensile strength, and on both sides this foundation is covered with layers of PVC that protect against moisture, ultrafilet and mechanical damage.
For catamaran-type boats, which are often operated in harsher conditions (rocky shores, dragging with a drag), the density of fabric plays a crucial role. The optimal choice is the fabric density from 750 to 1100 g/sq.m. five-layered PVC with additional protection against abrasion (for example, technology) Oxyden or PVC DensityLess dense fabrics (640-700 g/sq.m) are suitable for cruising models, but for serious fishing they may be weak.
⚠️ Attention: Don't believe the marketing tricks about "impenetrable" materials. Any PVC can be damaged. Not only the density, but also the quality of the welds is critical. For catamaran boats carrying high tensile loads, the seams should be made by hot welding with high frequency currents (HF), not glued.
Stiffness elements deserve special attention. NDMA It uses a special drop-stitch fabric (thousands of threads connecting the upper and lower planes) that allows the bottom to be pumped to a pressure of 0.5-0.8 atmospheres, turning it into a rigid plate. Catamarans often use additional inflatable elements or inserts of plywood / aluminum in the bow to maintain shape. Also an important element is the transom, which in powerful models is made composite or reinforced steel / aluminum plates inside the PVC pocket.
- 🧵 The reinforcing frame of lausan provides stability of dimensions when temperature changes.
- ☀️ UV stabilizers in PVC prevent the destruction of material under the sun.
- 🌡️ Frost-resistant additives allow you to operate the boat at temperatures up to -30 C.
- 🧪 Special coating protects against exposure to fuel (gasoline, oil) and sea salt.
☑️ Checking the quality of the boat when buying
Operation and safety on water
Operation catamaran-type boats The first and most important rule is to control the pressure in the cylinders. Since the cylinders work as the main floating elements and at the same time as the sides, their pumping in hot weather can lead to rupture of the seams, and failure to pump - to lose stiffness and stability. Always use a gauge and consider that in the sun pressure inside can increase by 0.1-0.2 atmospheres.
The second important aspect is the distribution of cargo. Despite its wide base, catamarans are sensitive to differentiation. Shifting the cargo (anchor, motor, passengers) to one of the sides can break the symmetry of the dive. Although it is difficult to turn the boat over, it can be heavily tilted, leading to water being thrown inside the cockpit through a splash-proof bulge. Centrification It should be strictly on the diametric plane.
Special attention should be paid to operation in windy weather. As mentioned, the wide sides of the catamaran work like a sail. In strong side winds, the boat can quickly demolish from the fishing point. Anchor system It is recommended to use two anchors (nose and stern) or one heavy anchor with a long chain that will lie on the bottom and extinguish the jerks. The use of lightweight folding anchors for a wide boat is often ineffective in current or wind.
⚠️ Warning: Never exceed the maximum load capacity specified in the data sheet. For catamaran boats, this parameter is critical, as when the cylinders are overloaded, the sailing and the risk of being overwhelmed by a wave increase, and the handling drops to zero.
When going out on a wide boat, it is important to distribute the weight of the passengers correctly. The optimal landing is closer to the diametric plane (CT) so as not to create heeling moments. The motor should be installed strictly in the center of the transom. If the engine is skewed, the boat will be led aside, and you will have to constantly work with oars or gas to hold the course, which consumes fuel and nerves.
Safety on the water begins with checking the pressure in the cylinders before each exit, an under-pumped boat loses its driving qualities, a pumped one risks bursting in the sun.
Transport, storage and care
Care for boat It doesn't require supernatural effort, but regularity is more important than the complexity of the procedures. After every fishing, especially in salt water or muddy (silky) terrain, the boat needs to be washed with fresh water. Sand and salt, when dried, work like an abrasive, rubbing the protective layer of PVC. Pay special attention to the valves - the sand that gets inside can break the seal.
Drying is a must before packaging. Even if the boat seems dry, there may be moisture in the folds and under the paioles. Keeping the wet boat rolled up is guaranteed to cause mold and break the adhesive layer. Drying is better in the shade, avoiding direct sunlight, which when heated on a wet surface can damage the material. Storage temperature It should be a plus, in a dry room.
Transporting wide catamaran boats in the trunk of a passenger car can be a challenge. Unlike narrow keel models that easily fold into a long "roll", the catamaran in the rolled-up form has a significant width. Packaging These models often require larger bags to be used (if the design allows you to detach the cylinders from the bottom). When transporting on the roof of the car in a case, it is important to securely fix the cargo, since the sailing of the packed boat is also high.
- 🧼 Use only soap solutions for cleaning, avoid aggressive chemicals and solvents.
- 🌡️ Avoid storage near heating appliances or open fires.
- 🐭 Protect the boat from rodents during winter storage (they like to gnaw PVC).
- 🔧 Regularly check the condition of the fittings and, if necessary, tighten the mounts.
⚠️ Note: Use only specialized two-component adhesives and PVC fabric identical to the boat material to repair punctures. Using "moments," superglues or vulcanization from car cameras will lead to irreversible damage to the material and inability to repair quality in the future.
Popular models and final recommendations
The inflatable boat market offers many models that implement catamaranAmong them, you can distinguish both budget options from domestic manufacturers (for example, some models of the Frigate, Aqua or specialized series of Riviera), and more expensive, technological solutions. When choosing a particular model, pay attention to the presence of an inflatable keel (some hybrids have it) or rigid elements in the nose that improve driving performance.
For fishing, the optimal length is 3.20-3.60 meters. Smaller dimensions will be cramped for two with full gear, larger (over 4 meters) will become too heavy and bulky to transport. width in the area of 1.50-1.60 meters provides the necessary comfort, but also allows you to row comfortably with oars in case of engine failure. Load capacity should be with a margin: if your weight with clothes and gear is 150 kg, take a boat for 300-350 kg.
How do you extend the life of a transom?
The truncheon is the most loaded place. To keep the screw from hitting the bottom when you're excited, don't hang the engine with the maximum power allowed "back to the back." Better to take the engine 10-15% more powerful than the face value than to overload the transan at the limit value. Also always use the safety cable for the engine.
In summary, it can be said that catamaran-type boat It's the choice of a pragmatic angler who values safety and comfort above record speeds, it forgives many mistakes for beginners, gives confidence in the water, and allows you to focus on fishing rather than maintaining balance, and if you're willing to put up with a little larger size in folded form and sailing, this type of boat will be your reliable assistant for many seasons.
How difficult is it to build a catamaran boat by yourself?
It takes a standard time of 10-15 minutes to assemble, but because of the width of the cylinders, it may be uncomfortable for one person to straighten the deck and fasten the mounts. It is recommended to inflate the cylinders first, straighten the bottom, and then, when standing inside, straighten the deck from nose to stern. In windy weather, it is more difficult for one to assemble a wide boat because of sail.
Can I use a catamaran boat for rafting?
Not recommended: PVC catamaran boats (PDD) are not designed to pass rapids and hit rocks; they are designed for stability, not rough water permeability; special rafting rafts with different strength specifications and geometry exist for rafting.
Which motor is better for a boat with a width of 1.5 meters?
For a width of 1.5 meters and a length of about 3.4-3.6 meters, the optimal motor will be a 5-9.9 hp motors of lower power (2-3.6 hp) may not bring the loaded boat to the plane due to the high resistance of wide contours. Two-stroke engines are preferable due to the lower weight, which is important for balancing.
Is it true that the catamaran is slower than a keel boat?
Yes, at the same power, the catamaran will develop a lower top speed, because of the laws of hydrodynamics: a wide stern creates more resistance, but the difference in speed is usually 3-5 km / h, which is often not a critical parameter for fishing compared to comfort.