Choice between a boat with low-pressure inflatable floor (LDPB) and solder The answer to a model often boils down to one question: Which one is faster? The answer depends not only on the design, but also on the engine's power, operating conditions, and even driving style. In this article, we'll look at the physics that influence speed, analyze the results of real-world tests, and provide clear recommendations for different scenarios.
Many people mistakenly believe that the unit boat always overtakes the NDNDM only due to the hard bottom. hydrodynamic resistance, structural weight and load distributionFor example, if you have equal motors, NHD can do better in calm water, whereas the junction will run ahead in the wave. Let's see why this happens.
Bottom design: how it affects speed
The main difference between the NDND and the solder boats is the design of the bottom. NDMA It is an inflatable cylinder with a pressure of 0.2-0.3 kg / cm2, which cushions the impacts, but creates additional resistance to water.floorboardThis design reduces the deformation of the movement, which should theoretically increase the speed.
But in practice, it all depends on ligature Most solder boats have a 12 to 18° wavelength cut and reduce drag, while NDNs are more likely to have a flat or slightly keeled bottom (up to 10°), which causes them to burrow their noses at high speeds, losing momentum. Bark Pro 380 or The flagship Grand 420) are equipped with reinforced keels which partially compensate for this deficiency.
- 🔹 NDNDM: soft bottom, high depreciation, but greater resistance at speeds over 40 km / h.
- 🔹 Pillar: Hard bottom, better handling on the wave, but higher center of gravity.
- 🔹 Hybrids: Some models (e.g., some models) Zodiac Pro 500) combine floorboards and inflatable elements to balance speed and comfort.
It is important to consider and constructionA solder boat is on average 20 to 30 percent heavier than BNDD of the same size because of metal or wooden elements, which means it will need a more powerful motor to achieve the same speed, such as to accelerate a solder boat. Flying wing 370 up to 50 km / h, you need a motor of 30 hp, whereas NDNDD Flagship 370 It will show 45 km/h with the same engine.
Hydrodynamics: Why a soldering boat isn't always faster
The speed of a boat is determined not only by the design of the bottom, but also by how it interacts with the water, and three factors play a key role here:
- Wetting surface: The larger the area of the bottom in contact with water, the higher the resistance, and in NDND, this area increases by deflecting the bottom under load, especially under low pressure in the cylinders.
- Splash trail formation: At speeds above 35 km/h, the boat starts pushing the water upwards, creating additional resistance, and the sharp-nosed payload models form a narrower footprint, saving energy.
- planing: The boats' ability to go out to the redan (to rise above the water) and the solder boats get on plane mode with less engine power due to the hard bottom.
But there is a nuance: calm-water The difference in speed between the NDND and the solder boat with the same engine can be as little as 5-10%. Boats and Yachts. (2023) showed that NDLD Bark 380 motorized Yamaha 25 hp It accelerates to 42 km / h, while the plyol Flying wing 380 With the same engine gives 47 km / h, but on the wave the gap increases to 15-20% due to the better handling of the solder model.
| Parameter | NDNDM (e.g., Flagship 420) | Pillar (e.g., Flying wing 420) |
|---|---|---|
Max, speed with 30 hpkm/h |
48–50 | 52–55 |
| Time to go out for planing, sec. | 8–10 | 5–7 |
| Resistance at 0.5 m wave | High (burrowing of the nose) | Medium (steady course) |
| Weight of structure, kg | 55–65 | 75–90 |
Interesting fact: some manufacturers (e.g., Zodiac or Bombarduse combinationThis is a combination of paioles and inflatable keels, which allows you to achieve the speed of a solder boat when you weigh NDL. Zodiac Pro Open 550 motorized 60 hp It shows 65 km/h, a result unattainable for classical NDNDM.
If you plan to operate a boat on a river with a strong current, choose a soldering model with a keel angle of at least 15 °. This will help to hold the course without additional effort.
Water tests: real speed figures
To objectively compare the NDND and the mutual boats, we analyzed the data of independent tests from the BoatTest.ru, "Profi Fishermen." All the tests were conducted in the same conditions: calm water, temperature +20 °C, load of 2 people + equipment (≈200 kg), the results were unexpected.
For example, NDNDM Grand 420 Flagship motorized Tohatsu 30bhp showed maximum speed 50.2 km/h... while the pile is Flying wing 420 same engine, and then it was 54.1 km/hThe difference of 4 km/h may seem small, but in practice it affects the transition time and fuel consumption. 15 hp The gap has decreased to 1-2 km / h, which makes the NDNDM more profitable in the budget segment.
- 📊 15 hp engine: NDND - 32-35 km / h, mutual - 34-37 km / h.
- 📊 30 hp engine: NDND - 48-52 km / h, mutual - 52-58 km / h.
- 📊 The 60 hp engine: NDND - 60-65 km / h, mutual - 70-75 km / h.
Particularly indicative of the tests wave 0.3-0.5 mPiedol boats show better course stability and less speed loss (up to 10%), while NDND loses up to 20% due to nose budding and increased resistance. Bark Pro 380 on the wave reduces the speed from 45 to 38 km / h, and Flying wing 380 - only up to 42 km/h.
⚠️ Attention: When operating BDL at speeds above 50 km / h, the risk increases floor-deformation This can cause seams to break or PVC to detach. Pillet boats do not have this disadvantage, but require regular checks of the floorboard attachments.
Why does the NDND sometimes overtake the PDD?
In some cases (e.g., with a weak motor or on very calm water), NDND may perform better because of its lower weight. Bark Shark) have less resistance than flat-bottomed flat-bottomed flat-bottomed flat-bottomed vessels.
Motor and Load: What is More Important for Speed?
Even the most perfect boat design will not produce record results without a properly selected engine. The boat needs a more powerful engine.For example, for a 3.8 m long NDND, a motor is enough. 20-25 hpto be able to enter the sanctuary, while the sanctuary will be required 30-40 hp.
critically important and weight-bearingEvery additional 50 kg reduces the top speed by 2-3 km / h. BoatTest.ru It turns out that NDNDM Flagship 420 with 3 passengers (≈250 kg) loses up to 8 km / h compared to the stroke alone. Flying wing 420 In the same conditions, she loses only 5 km / h due to the better distribution of weight on the hard bottom.
| Load, kg | NDMA Bark 380 + 30 hp |
Piolet Flying wing 380 + 30 hp |
|---|---|---|
| 1 person (100 kg) | 50 km/h | 55 km/h |
| 2 persons (200 kg) | 47 km/h | 52 km/h |
| 3 persons (300 kg) | 42 km/h | 47 km/h |
Another nuance. screw-typeFor solder boats, large pitch propellers are recommended (for example, 13-15 inches) which are better at capturing water at high speeds, and for NDNDM, smaller screws are suitable (9-11 inches), because they get the boat to plane faster, replacing the propeller can give you speed increases of up to 5 km/h!
Choose the power from the calculation of 1 hp. on 25-30 kg of weight of the boat + load |
For a solder boat, choose a motor 20-30% more powerful than for NDNDD |
Use a 13+ increments propeller for a solder boat and 9–11 inches for NDNDT|
Check the manufacturer's recommendations for maximum engine power.
Operating conditions: where the NDND can overtake the payload
Pieder boats are traditionally considered to be the speed leaders, but there are scenarios where BND may be faster or more practical:
- 🌊 Shallow waters and overgrown bodies of water: The flat bottom NDND is easier to overcome obstacles and less susceptible to damage when hitting snags.
- 💨 Weak wind and calm water: in the absence of waves, the difference in speed is minimal, and a lower weight of NDND may give an advantage in acceleration.
- 🔋 Economics: NDL requires a less powerful motor to achieve the same speed, which reduces fuel consumption by 15-20%.
- 🚤 Transport: NDNDM is lighter and more compact in folded form, which speeds up logistics (for example, when moving between water bodies).
Example: on a lake with smooth water NDND Flagship 370 motorized 15 hp It can develop 35 km / h, whereas a solder boat of the same size will show 37 km / h - a difference of only 2 km / h. But if you add a wave or headwind, the soldering model immediately breaks out.
It is also worth considering. maneuverability. NDNDM is easier to turn at high speed, but it is worse to steer the wave..... soldering boats, by contrast, require a larger turning radius, but are more stable on the straight, which is important for fishermen who often maneuver near shore or obstacles.
⚠️ Attention: When driving on BDL at speeds above 50 km/h, the risk increases loss And if you turn abruptly because of the deformation of the bottom, the solder boats are safer, but they require more careful handling of the gas on the wave.
Tuning for speed: how to accelerate the NDND or solder boat
If you don't like standard speeds, both designs can be upgraded.
- Installation of the hard keel: for example, aluminum-layer or composite reduces the deformation of the bottom and improves the course stability (+3-5 km / h).
- Increased cylinder pressure: bringing the pressure to the maximum permissible (usually 0.3-0.4 kg / cm2) reduces the wet surface.
- Replacement of the transom with reinforced: allows you to install a more powerful motor (for example, instead of 15 hp, put 20 hp).
Other improvements are effective for solder boats:
- 🔧 Replacement of floorboards with lightweight ones (for example, from cellular), which reduces weight by 10-15 kg.
- 🔧 Installation hydrofoil (for example, Stabicraft), which reduces drag at speeds above 40 km/h.
- 🔧 Optimization of body kits: removing unnecessary accessories (for example, heavy seats) can give + 1-2 km / h.
Important: Any modifications must be made to manufacturer's recommendations and norms GIMEFor example, installing a motor that is more powerful than the one allowed can lead to a denial of registration or cancellation of insurance.
The most effective way to increase the speed of NDND is to install a rigid keel and use the screw with the optimal pitch, and for a solder boat, weight reduction and improved bottom hydrodynamics are priorities.
FAQ: Answers to Frequent Questions
Can the engine be more powerful than the manufacturer recommends?
Technically yes, but it has consequences:
- 🔴 Risk of damage to the transmutor or seams of the bottom due to increased load.
- 🔴 Problems with registration in the GIMS (the engine must match the passport of the boat).
- 🔴 Loss of manufacturer warranty.
If you need a more powerful motor, choose a model of a boat with a margin of allowable power (for example, a boat with a power reserve). Bark 420 allows up to 50 hp).
Which boat accelerates faster: NDND or floorboard?
The solder boat is planing faster because of the hard bottom, but the HDD can show better acceleration in the first meters because of the lower weight. BoatTest.ru NDND Flagship 380 reached 30 km / h in 6 seconds, and the payroll Flying wing 380 - in 5 seconds.
Does PVC material affect the NDNDM speed?
Yes, but indirectly. More durable HPV (e.g., 1100 g/m2 opportunistic 750 g/m2) reduces the stretching of the bottom at high speeds, which can give an increase of 1-2 km/h. However, the main influence is not the material, but the design of the keel and the pressure in the cylinders.
Can I make the NDND as fast as the PDD?
Not at all, but you can reduce the gap to 5-10% by:
- 🔹 Installations of a hard keel and reinforced translator.
- 🔹 Use of lightweight materials (e.g., hypolatone instead of PVC.
- 🔹 Optimization of load and selection of screws.
However, the unit boat will still be faster on the wave and more stable at high speeds.
Which boat is more fuel efficient?
NDL uses 10 to 15 percent less fuel on equal motors because of the lower weight. Flagship 420 s 30 hp consumes ~12 l / h at maximum speed and soldering Flying wing 420 — ~ However, at cruising speed (30–40 km/h), the difference is reduced to 5%.