Choosing a swimming aid for fishing or relaxing on the water often comes down to finding the perfect balance between comfort, load capacity and weight. Inflatable boat for an outboard motor with an inflatable floor (often called NDND) has become one of the most popular solutions for outdoor enthusiasts who want to combine compact transport with high performance on the water, unlike models with slate or aluminum floors, this design provides a unique combination of softness and the ability to hold the wave.
In considering the options, double-seat The customer is faced with a wide range of technical solutions, from the type of PVC used to the configuration of cylinders. The modern market offers solutions that allow you to install motors with a capacity of up to 15-18 hp, turning a lightweight inflatable structure into a full-fledged planing boat. floor-floor It changes the physics of movement and the requirements for the assembly of the vessel.
In this article, we will discuss in detail the design features, advantages and hidden disadvantages of such boats, as well as give practical tips for operation. You will learn why many experienced water engines choose this type of bottom, and what nuances should be paid attention to when buying, so as not to be disappointed in the result.
Design features of the NDND boats
The basis of any quality flyboat It is a multi-layer reinforced polyvinyl chloride (PVC) that uses a special inflatable floor (BDB) model. Drop-Stitch Dropstitch is a material that allows you to create rigid flat surfaces that can withstand high pressure, and the technology is that thousands of synthetic threads connect the top and bottom shells of the floor, preventing it from inflating into a balloon when pumped, maintaining a predetermined geometry.
The design usually includes two main inflatable tubes forming the sides and one or two inflatable floor compartments, often with hinged bars between them to protect the sides from abrasion. transom boardThe engine can be inserted or integrated into the bottom structure, which directly affects the stiffness of the feed and the ability to get on plane.
⚠️ Warning: When buying, be sure to check for overpressure embedding valves (automatic or mechanical) in the sun, the air in the cylinders heats up and expands, which without pressure relief can lead to strain of the seams or even tearing the material.
The most important element is the sling system that connects the cylinders to the bottom, which ensures the overall rigidity of the hull. If the slings are stretched poorly or made of poor-quality material, the boat will "play" on the wave, and the driving performance will deteriorate dramatically. quill-systemwhich increases the longitudinal rigidity and allows you to keep the course more confidently.
Advantages of inflatable floor over hard
The main argument in favor of choosing a boat with an inflatable floor is its transportabilityThe assembled cylinders and soft bottom are packed in a compact bag that can be placed in the trunk of a passenger sedan, which is not possible for boats with plywood or aluminum floors. The weight of such a kit is also significantly lower, which facilitates loading and unloading by one person.
The second undeniable advantage is depreciationThe inflatable floor extinguishes the shocks of the wave much more effectively than the hard one, which makes swimming more comfortable for passengers and reduces the load on the spine of a fisherman who spends several hours in a boat, and also the soft floor is warmer to the touch and pleasant to the feet, which is especially important when fishing without shoes or in light shoes.
- 🚀 High speed of access to plane: Due to the streamlined shape and lightness, the boat quickly goes into planing mode, saving fuel.
- 🛡️ Safety: When hitting an obstacle, the inflatable floor will not penetrate the bottom, unlike thin aluminum, and will not split like plywood.
- 📦 Compact storage: It takes up a minimum of space in a garage or apartment in winter.
However, it is worth noting that the inflatable floor requires more careful preparation for descent, is sensitive to puncture from sharp stones or reinforcements on the shore, although modern materials are highly durable, and requires high pressure to maintain geometry and rigidity, usually around 0.2-0.25 atm (200-250 mbar), which requires the use of pressure pumps with pressure gauges.
Technical specifications and choice of engine power
When choosing double-boat for an outboard motor, the key parameter is the load capacity and maximum permissible engine power. Most models of the class of NDNDT length from 2.8 to 3.2 meters are designed for engines with a capacity of 5 to 15 hp For confident planing with two passengers and cargo, the optimal engine is 9.9 hp, which can often be forced to 15 hp.
It is important to consider the length of the engine's dayweight. Inflatable boats are most often suitable engines with a short lower unit (S - 381 mm), however, some models with a high cylinder or a specific transom design may require a long lower unit (L - 508 mm).
The table below will help to orient depending on the specifications of the boat on the power of the engine:
| Boat length (m) | Max engine power (hp) | Load capacity (kg) | Recommended speed (km/h) |
|---|---|---|---|
| 2.8 - 2.9 | 5 - 8 | 350 - 400 | 25 - 30 |
| 3.0 - 3.2 | 9.9 - 15 | 450 - 500 | 35 - 45 |
| 3.3 - 3.5 | 15 - 18 | 550 - 650 | 45 - 55 |
| 3.6+ | 18 - 25 | 700+ | 50 - 60 |
You don't have to chase for maximum power if the boat is used mainly for quiet fishing. A 5-6 hp motor will provide a speed of about 20 km / h, which is enough to move between fishing points, but will be much more economical and quieter than powerful analogues.
Materials and build quality
Durability PVC boats The inflatable floor is more densely constructed (typically 750-1100 g/sq.m.) than cylinders (700-900 g/sq.m.), as it is under constant strain on stretching and compression. The reinforcement net inside the PVC must be uniform, without tearing or thickening.
The quality of the seams is the second critical factor: good boats use two- or three-seam gluing using special adhesives, often heated (therm glue technology), such seams are not afraid of temperature changes and salt water. Cheap models glued "on cold" or having one wide seam, tend to deflect after 1-2 seasons of active use.
⚠️ Attention: When inspecting a new boat, carefully check the gluing places of the switches, handles and tanning board. This is where the gluing defects most often occur. Pressing the finger should not leave a dent on the glue layer.
The furniture also plays an important role. Cast aluminum The valves should be securely pasted and have protective caps to prevent sand and dirt from entering, which can disrupt the tightness.
How to check the quality of the stitches yourself?
Press the seam with your finger or blunt object, if you hear a crackle or see layers of tissue begin to diverge, it's a marriage, the quality seam is monolithic and does not make any extraneous sounds in moderate deformation, and you can also test with soap solution, applying it to a pumped boat and looking for bubbles.
Assembly and preparation for launching
Proper assembly flyboat The process begins with the installation of cylinders on a flat surface, free of sharp objects, inflating the cylinders and the bottom should be alternately, bringing the pressure in each compartment to the operating value indicated in the product passport (usually 0.25 atm for the bottom and 0.2-0.25 atm for the cylinders).
There is a common mistake where users pump the boat "before tolling" on shore and then leave it in the sun. The air expands when heated, and the pressure inside can exceed critical, causing the seams to rupture. Always leave a small margin or use pressure relief valves.
☑️ Checklist for boat assembly
The transom needs special attention, it needs to be placed in special pockets and fixed by safety slings, if the transom is wobbled or skewed, the motor will not work properly and the vibration will quickly destroy the stern design. Once all the elements are installed, you need to give the boat a standstill for 10-15 minutes before the final pressure check.
Operation, care and storage
The care of the boat NDND begins immediately after leaving the water. Salt water. You need to wash off with fresh, as the salt crystallizes and destroys the structure of PVC and glue, sand and dirt should be removed with a soft sponge, avoiding the use of abrasive cleaning products.
Drying is a critical step: the boat should not be packed wet or even slightly wet; in an enclosed space, when moisture is present, mold develops rapidly, which destroys the fabric and glue seams, and also creates an unpleasant odor; Dry in the shade, as direct sunlight on a pumped boat can lead to its deformation (the “lens effect” through transparent areas or simply overheating).
- 🧼 Cleanup: Use warm soapy water and a soft brush to remove persistent contaminants.
- ☀️ UV protection: During a long parking on the water cover the boat with an awning or use special sprays with UV filters.
- 🌡️ Temperature: Keep the boat at a temperature of -20 to +40 degrees Celsius, avoid sudden changes.
⚠️ Warning: Never keep the boat rolled up under heavy objects. Prolonged compression leads to the formation of "cracks" on the material, which can later become points of tear when pumped.
A breathable cloth case is ideal for storage. If the boat is stored in a garage, it is better to keep it half-flattened or suspended to avoid pressure on the bottom layers of the material. Regularly treating rubber valve seals with silicone lubricants will prolong their service life.
If you plan to keep the boat in an unheated room in the winter, make sure it is completely dry. Condensation formed by temperature changes inside the rolled-up boat can cause layers of fabric to freeze to each other, and when you try to deploy in the spring, the material can break.
Frequently Asked Questions (FAQ)
Can I use a boat in winter or in cold weather?
You can use it, but with caution. PVC becomes hard and brittle at low temperatures (below -5°C); you only need to inflate a boat in a warm room, and in the cold you only need to get pressure; sharp impacts on ice or rocks at negative temperatures can lead to cracks in the material.
How long does the inflatable floor last during active operation?
When used carefully and properly stored, a quality inflatable floor lasts 5-7 years or more, however, if the boat is often used in shallow water with a rocky bottom or drag on the sand without protection, the service life can be reduced to 2-3 years.
Do I need to buy a separate pump for the inflatable floor?
It is desirable to have a pump with the ability to switch modes or a separate foot/electric pump with a pressure gauge. The bottom requires higher and more accurate pressure than cylinders. A conventional "frog" pump may not provide the necessary effort for the final pumping of the bottom, especially in windy weather or at low temperatures.
What is the difference between a slug boat and a slug boat?
A boat with slurry (plywood or aluminum sheet) is tougher to the touch and cheaper, but heavier and longer to assemble. A NDND boat is lighter, faster to assemble, better to ride the wave (softer impact), but more expensive and requires more careful care for floor pressure. For glides with a powerful motor, NDNDM is often preferred because of better hydrodynamics.
An inflatable floor boat is a choice for comfort and speed of assembly, but it requires a disciplined attitude to pressure control and storage conditions.