The Russian inflatable swimming equipment market has undergone a dramatic change in recent years, shifting its focus from imported samples to domestic developments. Among the many brands offering their solutions, Flagman stands out, whose products have become synonymous with reliability for thousands of anglers and hunters across the country. NDMA (Low Pressure inflatable floor) deserves close attention as it offers a unique balance between the comfort of a hard floor and the ease of assembly.
The main feature of these vessels is the design of the bottom, which is formed from several sealed compartments, inflated to a certain pressure, which allows you to avoid the use of heavy plywood or complex aluminum profiles, significantly reducing the overall weight of the kit. For the owner, this means the ability to transport cargo in the trunk of the car and quickly prepare for descent into the water without unnecessary physical effort.
In this article, we will discuss the technological nuances, consider popular modifications and give operating recommendations so that your purchase will serve faithfully for many years. Understanding the physical properties of materials and design features will help you make an informed choice, avoiding common mistakes of beginners when first getting acquainted with the products of the Novosibirsk plant.
Design and features of the bottom of the NDND
abbreviation NDMA It stands for "Low Pressure inflatable floor," and that name is the whole point of the engineering solution. The bottom is a single structure of several longitudinal cylinders that, when pumped, form a rigid plane. Unlike classic floorboard boats, there are no rigid elements, which eliminates the risk of damage to the internal seams on the floor edge when moving.
It is important to note that the stiffness of the bottom is directly dependent on the quality of the stitches and the density of the fabric used. double-reinforceWith proper pumping (usually 0.2-0.25 atmospheres), the bottom becomes comparable in stiffness to wooden decking, ensuring a stable position of the angler even in full growth.
⚠️ Warning: Never leave a pumped boat in direct sun in hot weather unattended. The air pressure inside the cylinders increases proportionally to the temperature, which can cause the seams to rupture or deform the structure if not blowing excess air.
One of the key advantages of this scheme is hydrodynamics: the streamlined shape of the bottom cylinders reduces the resistance of water when driving, which is especially noticeable in planing; the engine requires less power to enter mode, which has a positive effect on fuel consumption and engine life; In addition, the absence of gaps between the floorboards makes the boat absolutely unsinkable even if one of the cylinders is completely damaged.
Stitching technology
Flagman boat strength is based on the method of gluing the seams to the cross using two-component polyurethane adhesive. This ensures a monolithic bond that is often stronger than the PVC material itself. Unlike welds, adhesive joints have a certain elasticity, which is critical for inflatable structures that experience constant dynamic loads.
Materials and quality of execution
The basis for the production of boats is dense reinforced polyvinyl chloride (PVC). The NDNDM series typically uses fabric density from 750 to 920 g/m2, which is the gold standard for medium-sized vessels, and is highly resistant to abrasion, gasoline, oils and ultraviolet radiation.
Special attention should be paid to fittings and components: leading manufacturers, including Flagship, install Frog valves or improved versions, which allow you to quickly pump and burn air, and also reliably hold pressure for a long time. The quality of the plastic from which the valves are made should eliminate fragility in the cold.
- 🛡️ Reinforcing layer: A polyester mesh soldered between the PVC layers gives the fabric tensile strength and prevents the material from creeping under load.
- 🧪 Chemical resistanceSpecial additives in the composition of the polymer provide resistance to fuel, which allows you to safely place canisters with fuel inside the cockpit.
- 🌡️ Temperature conditions: Quality PVC retains elasticity at negative temperatures up to -30°C and does not melt in the sun at +50°C.
The seams that connect the cylinders and the bottom elements are the most critical part of the structure. Flagship boats use double or triple gluing, which creates a reliable safety buffer. Even if the outer layer of the seam is damaged by a sharp object, the inner layers will continue to hold the pressure, allowing you to safely complete the fishing and get to shore.
To prolong the life of the fabric, regularly treat it with special means with UV filters, which will prevent plastic from drying out and microcracks, especially if the boat is often stored assembled in the garage or on the street.
Popular models and their specifications
Flagman’s line of NDND covers a wide range of needs, from single compact boats to full-fledged family boats. Each model has its own specifications, dictated by size and expected load. Understanding the differences will help you choose the best option for your engine and style of riding.
The most popular models are 3.20 to 3.60 meters long, with enough payload capacity to accommodate two full-fit adult fishermen, but still light enough to carry. 360 or 380, already focused on trophy fishing and require engines from 9.9 hp
Below is a comparative table of the main specifications of popular models, which will help to orient in the range:
| Model | Length (cm) | Width (cm) | Load capacity (kg) | Kit weight (kg) |
|---|---|---|---|---|
| Flagship 320 NDLD | 320 | 145 | 550 | 42 |
| Flagship 340 NDLD | 340 | 150 | 650 | 48 |
| Flagship 360 NDLD | 360 | 155 | 750 | 54 |
| Flagship 380 NDLD | 380 | 160 | 850 | 61 |
When choosing a size, it is important to consider not only the number of passengers, but also the operating conditions. For small lakes and rivers with strong currents, narrower and more maneuverable models are preferable. For large reservoirs where the wave often rises, it is better to take a boat with a larger width and height for comfort and safety.
Assembly and preparation for operation
The process of building a boat with an inflatable floor is very different from the classic schemes with paiola. You don't have to spend time laying out and joining heavy sheets of plywood or aluminum. The whole procedure is to pump the cylinders in a certain sequence, which takes many times less time.
First, you need to spread the boat on a flat surface, clearing the place of sharp objects, branches and stones, the first thing you recommend is to slightly pump the cylinders of the sides to give the body its original shape, which will facilitate access to the valves of the bottom and prevent the material from pinching during further pumping.
Then you have to pump the sections of the bottom, and you have to keep the pressure even: you don't have to pump one compartment to the maximum, leaving the next compartment empty, you have to go through all the sections in a cycle, adding the pressure gradually, and the final pressure is checked by pressing your finger, and the surface should be elastic, not stone.
☑️ NDNDM boat assembly algorithm
Once the pumping is complete, you need to check the tightness of all the joints and valves. If the boat has stood pumped for several hours and the shape has not changed, you can safely get on the water. Remember that in cold water the pressure may drop, so before descent, you should check the cylinders again and if necessary pump them.
Operation and selection of motor
The NDNDB series is seaworthy and can be confident in the water in moderate chop, but like any boat, it has its limitations. inflatable floor design is more sensitive to overload than hard bottom boats, so compliance with rated carrying capacity is critical for safety.
When choosing the engine should start from the length of the boat and the desired speed. For models with a length of 320-340 cm, the optimal choice will be motors with a capacity of 5-9.9 hp They will provide access to planing with one or two passengers. For larger modifications (360-380 cm), it is recommended to consider engines with a capacity of 9.9 to 15 hp, which will allow planing even with a full load.
An important aspect is the installation of the transom motor, because the bottom is soft, the center of gravity is shifted, and the wrong weighting can lead to a nose burying in the wave, it is recommended to position passengers and cargo in such a way that it provides a light defferent on the stern when entering the planing, and then level the boat.
⚠️ Note: When installing a motor close to the maximum allowable, be sure to use a power limiter (long thrust) if the engine is new, this will allow you to run the engine and test the behavior of the boat at safe speeds without risking damage to the transom.
Driving a boat with NDND is usually easy, but it is worth remembering sailing. inflatable tubes create a high landing, which makes the boat sensitive to lateral wind. In high winds, it is recommended to slow down and keep the course at an angle to the wave to avoid sharp yaws.
The optimal power of the engine for the boat 340-360 NDND is 9.9 hp - this is the "golden mean", allowing you to comfortably plane together and save fuel on small moves.
Care, storage and repair
The durability of your boat depends on how you care for it. After each foray into the water, especially if you have been swimming in salt water or on a sluggish bottom, the boat needs to be thoroughly washed with fresh water. Salt and dirt, when dried, crystallize and can damage the PVC structure or fittings.
Drying is a must before packaging, and even minimal moisture inside a rolled-up boat can cause mold and a bad smell that is very difficult to get rid of, and it is better to dry the boat in the shade, as direct sunlight on pumped-up cylinders can cause them to deform.
Store the product in a dry room at temperatures that exclude freezing. Although modern materials are designed for low temperatures, the constant cycles of freezing and thawing do not benefit plasticizers in PVC. When rolled up, the boat should not be pressed with heavy objects.
In the case of a puncture or cut, you can do the repair yourself in the field, usually a repair kit with a piece of cloth and glue is included, the damage is degreased, cleaned with a fine skin, and then a patch is applied with a minimum of 3 cm on all sides.
How to properly glue PVC in the field
If you can't use two-part glue, you can use a single-part polyurethane glue (such as Uranus or 88-NP), the main thing is to let the glue dry for 10-15 minutes on both surfaces before gluing, and then warm the glue site with a hairdryer or hot water (if the air temperature allows) to activate the glue.
Frequently Asked Questions (FAQ)
Can I use a boat in winter for fishing?
You can use the boat in winter, but with caution. PVC becomes tougher in the cold, so you need to pump the cylinders very carefully, not exceeding the pressure, and avoid hitting the ice. Keeping the boat at negative temperatures is not recommended, it is better to bring it into the heat after fishing.
How long does it take to assemble a boat with NDND?
It takes about 10-15 minutes for a powered user to fully assemble and pump a boat with a foot or electric pump, which is significantly faster than building paiole-bottomed boats, where it takes time to lay and connect floor sheets.
Do I need to register the Flagman boat in GIMS?
Registration is subject to vessels weighing more than 200 kg (together with engine and equipment) or with an engine capacity of more than 8 kW (about 10.8 hp). Most models of BNDD with engines up to 9.9 hp and light batteries often fall into the category of up to 200 kg, but accurate calculation is better to make according to the technical data sheet of a particular model.
How is the NDNDD different from Kieleva's NDD?
The keel version has an extra keel balloon in the center of the bottom, which improves course stability and handling at high speeds, but it is a little heavier and more difficult to build, so you need to pump the additional element.