The choice of a watercraft is always a compromise between mobility, comfort and reliability. In the inflatables segment, the classification by bottom type deserves special attention, and the acronym is an acronym for the bottom. NDMA (Low Pressure Bottom) is becoming a key marker for those who value ease of assembly and safety, and the 3-meter-90-centimeter boat in this design represents a “middle ground” for most water-engines, making it a safe threesome.
Unlike classic models with removable hard floorboards, there is no need to drag heavy aluminum sheets and tinker with their complex stacking in the cockpit. High quality inflatable floor It's made of layered fabric that, when pressurized, becomes rigid, and it's very seaworthy and impact-resistant, and it's this factor that makes it popular with anglers who often change water bodies and don't want to waste time on long builds.
But every medal has a flip side. NDMA It's much lighter than the pituitary, it has its own limitations on maximum engine power and weight load. Understanding the physics of the process and the right equipment will allow you to unlock the potential of this boat to the fullest, turning the get on the water into pleasure, not in the fight against wind and wave.
Design features of the model 390 NDND
The basis of any quality boat is the material. PVC 390 NDDN The five-layer reinforced fabric is usually used, with a density of at least 750 g/sq.m. This margin of safety is necessary, since the inflatable floor takes the main load when sliding, the sides are usually reinforced with a bolt, which protects the structure from abrasion when moored to the shore or berth.
The bottom itself is a complex system of thousands of internal strands connecting the top and bottom surfaces. When pumped to the working pressure (usually 0.2-0.25 atm), the structure becomes rigid, but retains a certain elasticity. quench This is a wave, which is critical for the safety and comfort of passengers at high speeds.
It is important to note the geometry of the cylinders. In 3.90-meter models, manufacturers often use cone-shaped nose tips, which improves sensibility per wave. swan-ring And the handles for carrying, and in the stern - comfortable stops for the legs and fastening of the transom.
We should mention protection. 390 NDLD It's equipped with massive rubber hangers all around the perimeter, and it's not just a decor, it's a necessary measure of protection against cuts and punctures. keel-strip or even a full-fledged inflatable keel, which improves the exchange rate stability.
⚠️ Warning: Never leave a pumped NDND boat under direct sunlight for long periods of time unattended. The air pressure inside the cylinders and bottom may exceed the permissible limits, leading to seam strain or tissue rupture.
Advantages and disadvantages of inflatable floor
The transition to an inflatable floor structure is a major change in the experience. kit-weightIf a solder boat of the same size weighs about 60-70 kg in the assembly, then the NDND version rarely exceeds 45-50 kg. This allows you to transport the boat in the trunk of a passenger sedan without having to disassemble it into many small parts.
It takes a very short time to assemble, and you don't have to push heavy sheets of aluminum into the cylinders, risking damage to the fabric or grease, just spread the boat, pump the cylinders and the bottom, and the boat is ready to go down, which is especially valuable when you need to move quickly to another body of water or when assembly is in difficult weather conditions.
Use an electric pump with auto-stop function to pump the bottom of the NDNDM. This will save your energy and ensure that the pressure is uniform throughout the area, which is critical for the rigidity of the structure.
But there are downsides to not being silent about, and the inflatable floor, even the best, has less bending rigidity than aluminum, and at high wavelengths, it can feel like a little slapping or vibration, even though current models have minimized this effect. loading capacity Such boats can be slightly lower than those of hard-bottom analogues of the same length.
Another important aspect is thermal insulation, and when you're on the water, you're sitting directly on an inflated bottom that, unlike metal, doesn't conduct cold, which allows you to fish comfortably in the early spring or late fall without using additional mats, but it's worth remembering that the soft bottom is more vulnerable to stabbing objects at the bottom of the pond.
- 🚀 Assembly speed: Full readiness for descent in 10-15 minutes without heavy physical exertion.
- ⚖️ Weight: It is much easier than the pyeol versions, which makes it easier to carry alone.
- 🌊 Comfort: Excellent shock amortization of the wave and thermal insulation, no need to lay the mats.
- 🛡️ Safety: It is impossible to drown even when completely filled with water, since the cylinders have many compartments.
Comparison: BND against a solder boat
Choosing between these two types is often a stumbling block for beginners. To make an informed decision, you need to clearly understand the difference in purpose. The solder boat is the choice of those who are at maximum speed and plan to put maximum power motors. The hard bottom provides perfect aerodynamics and no bottom sailing.
Boat. 390 NDLD It's a versatility-oriented, convenience-oriented, low-speed, literally 2-4 km/h, but it's a win-win in comfort, and if you plan to change fishing spots often, drag a boat along the shore, or use it for family walks, the absence of heavy floorboards is a crucial factor.
Hidden bottom geometry
Inside the inflatable floor of the NDND, there's a system of thousands of threads that keep it from swelling into a ball, they're shaped like a flat plate, and in solder boats, this is a framework of aluminum sheets, and it's the threads that create the kind of rigidity that many people mistakenly attribute to metal.
The table below provides a detailed comparison of specifications that will help you decide on the choice:
| Characterization | Boat 390 NDLD | Pillet boat 390 |
|---|---|---|
| Weight gathered | 45-52 kg | 60-70 kg |
| Assembly time | 10-15 minutes | 25-40 minutes |
| Bottom hardness | High (at the right pressure) | Maximum |
| Seat comfort | Tall (warm, soft) | Low (need mat, cold) |
| Max, speed. | Medium (depending on the motor) | High. |
Also worth considering is the cost. NDMA They are often more expensive than plywood or aluminum floorboards because of the more complex technology of the bottom itself, but when you calculate the cost of transportation and the time spent, the price difference quickly pays off.
Choice of motor for boat 390 NDND
The right engine is the key to successful operation. For a length of 3.90 meters and the design of the NDNDM, the optimal engine is a motor with a capacity of 9.9 to 15 horsepower. 9.9 hp will allow you to confidently go on plane with two passengers and a minimum load, ensuring economical fuel consumption.
If you plan an active fishing with a full load of tackles or a trip, it is better to look at the power engines. 15 hp They will provide a confident ride even against wind and wave, but too heavy a motor can "hit" the nose, deteriorating handling.
The optimal power range for the boat 390 NDND - 9.9-15 hp Installation of the engine is more powerful than 15 hp is impractical due to the limitations of the transom design and loss of controllability on the wave.
Short-legged motors are better suited for shallow rivers, although for boats of this size the standard is the long leg (508 mm), which provides better propeller efficiency and less noise. slab-stove to protect the transom.
And don't forget to adjust the trim, because inflatable boats, the position of the engine affects the speed of the plane, and you can experiment with the tilt of the engine, you can achieve better acceleration dynamics, and you can also install it. door-wheelEven a light boat with an engine is difficult to carry along the shore.
Operation and care of PVC
The durability of your boat depends on how you care for it, and after every trip to the water, especially if it was salt water or a body of water with abundant vegetation, the boat needs to be rinsed with fresh water, which will prevent the corrosion of metal fittings and the destruction of glue by ultraviolet light combined with salt.
Drying is a critical step. Before packing in a bag, the boat must be completely dry. Even a small amount of moisture inside the case can lead to mold that destroys the reinforcing layer of tissue.
- 🧼 Cleanup: Use a soft sponge and soap solution. Aggressive chemicals and solvents are prohibited.
- ☀️ Storage: Store the boat in a dry room at a temperature of -20 to +40 degrees, away from heating devices.
- 🔧 Repair: Always carry a remix. Small cuts are easier to seal at home than to look for a hole in the water.
Special attention should be paid squirt-boardIt's often made from moisture-resistant plywood, but the ends need to be protected, and if you notice that the plywood has begun to delaminate or blacken, you need to immediately remove the coating, dry, clean and coat with a new layer of varnish or epoxy.
⚠️ Attention: If you puncture a tank far from the shore, don't try to seal it right away. Use the remix only to temporarily stop the descent to get to the base. Quality repair requires dry and low-fat surfaces.
Tuning and additional accessories
The basic equipment of the boat is just the beginning of the journey, and for comfortable fishing or recreation, it often requires improvement. string They add extra rigidity to the sides, they remove the drum effect, and they increase the overall speed.
Many owners also have a number of sonar And navigators. For NDND boats, there are brackets that are attached directly to the cylinders without the need to drill a transom, which allows you to quickly dismantle the electronics and take the boat fishing with you in the winter, using it as a sled.
☑️ Checklist before season
It is not superfluous to take care of the protection of the bottom. Special PVC linings or keel tapes will significantly extend the life of your boat when pulling on a rocky shore. soft-seat with pockets for gear, which is attached to transom cans.
Frequently Asked Questions (FAQ)
What is the optimal pressure to pump to the bottom of the NDND?
The working pressure at the bottom of the NDND is usually 0.2-0.25 atmosphere (about 3-3.5 PSI). Pumping above 0.3 atm is dangerous, especially in hot weather, as this can lead to rupture of internal strands or seams. The bottom should be hard to the touch, but not "stone".
Is it possible to go to sea on a boat 390 NDND?
Yes, boats of this class are suitable for coastal navigation, provided that the weather is good and there is no strong storm, but after contact with salt water, the boat must be thoroughly washed with fresh water to avoid corrosion of the accessories and the destruction of glue seams.
How long is a PVC boat?
With proper care and storage, the service life of a high-quality PVC reinforced boat is 10-15 years or more. The main enemies of the material are ultraviolet radiation, improper storage (in compressed form) and mechanical damage by sharp objects.
Do I have to regress the boat every season?
No, modern two-component polyurethane adhesives used in manufacturing provide a reliable connection for many years, re-sticking is only required in the event of mechanical damage or if the boat is very old and the glue has lost its properties (began to crumble).