How to choose transom wheels for PVC NDND boat: a complete guide

The operation of a low-pressure inflatable boat (LBP) is very different from the use of classic hard floorboard boats. The main feature of the BPD design is the lack of rigid elements inside the cylinders, which makes it impossible to use standard removable mounts that are cut directly into the floor. Owners of such boats have to look for alternative solutions for transportation, since dragging heavy equipment by hand through sand or stones can turn a pleasant fishing into a test of endurance.

Choice transom-wheel It's not just a matter of comfort, it's a necessity dictated by the design of the hull. The wrong system can damage the sensitive bottom or flip the boat when you go down, and that's why you need to approach the equipment with engineering precision, considering the weight of the motor, the type of transom, and the features of the coastline you plan to launch from most often.

In this article, we will discuss in detail all the nuances that will help you make an informed decision, we will look at the types of fasteners that are compatible with the soft bottom, analyze the materials of manufacture and give practical installation tips that will save your boat from damage.

Design features of the boats and the impact on the choice of wheels

Low-pressure inflatable floor boats, often called air deck or soft floorThey have a unique transomature geometry, and unlike hard bottom boats, where the transom is rigidly fixed with paioles, the transmutation board often has a backlash and relies only on cylinders, which places serious limitations on the loading point when installing the wheel stroke.

The main problem is that classic wheels that are attached to the grooves under stringers or cut into the floor can not be physically installed here. Any attempt to rigidly fix the "floor" will lead to deformation of inflatable tubes and loss of leakage, so the only reliable option is to attach directly to the transom board.

⚠️ Attention: It is strictly forbidden to install wheel stops in inflatable tubes or try to fix the structure with belts passing under the bottom of the boat, this is guaranteed to lead to wiping of the PVC fabric and depressurization of the body when moving.

When choosing a model, it is important to consider the height of the transom. In many boats, the transom can be bent or have a specific shape of "ears" to attach the cans. The wheel drive must have a sufficient departure so that when the wheels are lowered, neither the bottom of the boat nor the water surface when moving, creating parasitic resistance.

Types of fastenings: what is compatible with the soft bottom

The market offers several solutions, but not all of them are suitable for soft-bottom boats. Let's look at the main types of fasteners that you can find on sale and evaluate their applicability in our case.

The first and most common option is bolt-holdingThey require drilling of a transom board. For boats, NDM is often the only reliable way to rigidly lock the axis. Bolts pass through a transmolina, and on the inside of the boat they are put on the wheels themselves. When moving, the wheels are outside, and when going out into the water they are removed.

The second option is pendant They are attached to the top edge of the transom using powerful screws, which seems attractive because it does not require drilling, but has a critical disadvantage: on NDND boats, the top edge of the transom is often rounded or not thick enough to grip reliably. When a wheel enters a pit, such a bracket can jump off, which will cause the boat to fall.

The third type is the universal system with adjustable levers, which allows you to change the angle of inclination of the wheels relative to the transom, and this is especially true for boats with high or low transmuters, where standard geometry does not work, but such systems are usually more massive and require a more careful approach to installation.

Manufacturing materials: steel, aluminum or plastic

The durability of transom wheels depends on the material from which their frame and axle are made. In an aggressive aquatic environment and constant contact with sand and salt, the choice of material becomes a critical factor.

The most common material is stainless steelIt's a great choice for those who are operating a boat in salt water or just want to get the maximum life of the product. Steel structures are heavier, but they are practically not corrosive if it is a quality stainless steel AISI 304 or 316.

Aluminum alloys (usually) D16T It's a lot lighter than steel, and that's important because the extra weight on the transom can degrade the boat's performance, especially at low power, but aluminum requires high-quality anodizing, and if the protective layer is damaged, it's going to oxidize, and in a couple of seasons, the axis might just fall apart.

Materials	Weight.	Corrosion resistance	Price.
Stainless steel	Highly	Great.	High.
Aluminum (anodized)	Low.	Good.	Medium
Galvanized steel	Medium.	Low.	Low.
Plastic (composite)	Very low.	High.	Low.

Plastic and composite frames are less common. They don't rust at all, but their kink strength is questionable, especially if you plan to carry heavy motors (over 15 hp) and lower a boat down a steep slope. For light boats and small motors, this can be a budget decision.

Diameter and type of wheels: passability and load

The wheels themselves are just as important as the mounting. Their diameter and width determine whether you can ride a boat on soft sand, rocky shoals or viscous mud. The small wheels, which often come with cheap boat models, are only suitable for flat asphalt.

For boats NDND, which are often used on wild shores, it is recommended to choose wheels diameter. at least 250-300 mmA wide rubber tire allows the weight of the boat and the motor to be distributed, preventing burying in the sand. Narrow wheels (like bicycles) will go into the ground along the axis, making transportation impossible.

The type of tire also matters: Inflatable chambers inside the tire provide better cushioning, which is important when driving on rocks so as not to damage the bottom of the boat in an accidental impact. Cast polyurethane wheels ("supermarkets") never go down, but they are rigid and transmit all vibrations to the transom, which can be harmful to the mounts.

• 🚜 Ground-locks: For viscous dirt and grass, choose wheels with a pronounced tread.
• 🌊 Smooth sole: Better for sand and pebbles, less clogged with stones.
• ⚖️ Load capacity: The total load on a pair of wheels should exceed the weight of the boat + engine + equipment by at least 30%.

Instructions: how to properly install the wheels on the transom

The installation process requires accuracy and accuracy of markings. A mistake of several millimeters can cause the wheels to touch cylinders or topping up the boat while driving. Before starting work, make sure that the boat is fully pumped and lies on a flat surface.

First, you need to determine the mounting point, usually the center of the traverse board or a little bit lower, if the design permits. Put a bracket and circle the drilling points with a marker. It's important to make sure that when you lower the wheels down, they don't run into the inflatable tubes (the "ears" of the boat).

The drill should be made with a drill with a diameter corresponding to the fastening bolts (usually 8-10 mm). polyurethane sealant Or a special glue for PVC, which would prevent moisture from entering the multilayer tissue of the transom, which could lead to stratification.

When you finalize the nuts, use larger diameter washers to spread pressure to the surface of the transom. Don't pull the bolts overboard, which can deform the wooden base of the transom inside the PVC plating. Once installed, let the sealant dry completely according to the manufacturer's instructions before first use.

⚠️ Attention: Never leave the wheels in a lowered position while driving on water, which creates tremendous resistance, slows down speed and can cause the mounts to break or even tip over when faced with a wave.

Operation and maintenance of trans-shipment equipment

Even the best quality transom wheels require maintenance, especially if they are operated in salt water. Salt is the main enemy of metal products, and regular rinsing with fresh water after each fishing will significantly extend the life of your equipment.

Pay special attention to bearings or sleeves in the axis of the wheels. If you feel that the wheels have become tight or creaking, they need to be removed, sand cleaned and lubricated. lithium-lubricant Or, a WD-40 (for displacing moisture) spray followed by a thick lubricant.

What to do if the corrugated bolt of the mounting is rusted?

If the bolt of the bald mounting does not unscrew, do not use excessive force to avoid breaking the thread. Treat the connection with penetrating lubricant (for example, "liquid key") and leave for 15-20 minutes. If it does not help, carefully heat the nut with a building hairdryer (not open fire!), the metal will expand and move from place.

Keep the wheels removed, in a dry room. If you can not remove them (for example, you have a non-removable model), make sure that they are raised to the upper position and fixed, so as not to damage other things during storage.

Frequently Asked Questions (FAQ)

Can transom wheels be used for inflatable keel boats (BBN) without transom drilling?

In theory, there are overhead designs, but for NDND they are highly discouraged because of the risk of slipping and damage to soft cylinders. It is safer to make neat holes with high-quality sealing than to risk the integrity of the boat on the water.

What is the maximum weight of the engine that the standard wheels can withstand?

Most high-quality models are designed for motors up to 20-25 hp (about 50-60 kg). For more powerful motors (30+ hp), it is recommended to look for reinforced models with wide rubber and steel axles with a diameter of at least 12 mm.

Do I need to remove the wheels before each launch?

Yes, you must. Swimming with your wheels down is dangerous and inefficient. The process of taking off/lowering takes seconds, but it keeps you safe and your engine life. There are quick-removal models that solve this problem.

Will the sealant damage the structure of PVC during long-term operation?

Specialized PVC sealants and polyurethane compounds are chemically inert to the boat material and do not destroy it. Problems can only arise with the use of aggressive acid or bitumen mastics that are not designed to come into contact with PVC.