The inflatable boat cannot be operated without a reliable transportation system, where the PVC boat's emphasis on the trailer is critical to maintaining bottom geometry. Properly selected and installed support prevents the boat from sliding under heavy braking and minimizes friction on metal components during a long journey along the track. Mistakes during the selection or installation phase can lead to cylinder deformation, loss of seams and even accidents on the road when the shifted cargo disrupts the trailer's weight.
The modern market offers many solutions, from simple rubber rollers to complex telescopic systems with height adjustment. keel and flight-board In this article, we will discuss the technical details, help you choose the best material for supports, and provide step-by-step installation instructions that will extend the life of your boat.
Design and purpose of support elements
The main task of any stop is to fix the boat in a given position relative to the axis of the trailer, without damaging the delicate PVC material. Structurally, the system consists of the most support element (wall, roller or bracket), fastening stud and adjusting nuts. Keel-stop takes the main load when reversing, preventing the boat from sliding from the trailer, while the on-board limiters keep the boat from lateral displacement in turns.
It's important to note that inflatable boats are not necessarily designed for rigid metal stops without a special coating, and even high-quality painted steel can erase the protective layer of the balloon when vibrating. EPDM rubbers It's also a high-density polyurethane, which is very durable and doesn't absorb water, and some models have rolling bearings, which makes it easier to load the boat onto the trailer by self-loading.
Stress geometry also matters. Low-pressure inflatable keel (LND) boats require wider, softer rollers to spread pressure over a larger area. Hard keel (LFA) allows smaller-diameter but stiffer-core stops. Incorrect shape-setting will result in local pressure points that can eventually cause microcracks in the material.
⚠️ Note: The use of wooden bars as temporary stops is permissible only in emergency cases, since the tree swells from moisture, rots and may have sharp splinters that can puncture the balloon.
When you look at the standard stops on an old trailer, you often find that the rubber elements have cracked from ultraviolet light or lost their elasticity. Replacing these components is the first thing you need to start preparing for the season. Don't skimp on the quality of the rubber, because the cost of a new PVC cylinder for a boat is incomparably higher than the price of a quality set of stops.
Types of stops: keel, side and nose
The system of fixing the boat on the trailer is usually combined and includes several types of supports. Keel-stop It's located on the center axis of the trailer, and it's the main point of support when you go back, and it takes over the inertia of the boat, and the side axes, or wings, are mounted on the sides of the frame, and prevent the boat from falling into the ground when the trailer rolls or when the side winds are strong while you're driving.
The nose also needs attention. nose-stamp Or an additional support pad under the bow bolt, which works in tandem with the winch. For heavy boats with a hard transom and built-in gas tank, the weight is shifted back, so the front group of stops should be exposed with minimal clearance, but without a drag so as not to deform the bow of the cylinders.
Telescopic stops are particularly noteworthy, allowing you to change the height of the support pad, adjusting to different heights of the cylinder or the presence of attachments (for example, a sonar on the nose), adjusting by rotating the roller itself or moving the bracket along a vertical guide, which is especially convenient for families using the same trailer for different boats.
There are also specialized roller-pinUnlike static rollers, rollers rotate around their axis, which significantly reduces friction when loading a boat by rolling, but static rubber stops are often preferred for transportation, since they provide more stable fixation and are less susceptible to pollution by sand, which works like an abrasive.
Manufacture materials and their effect on PVC
The choice of the support material is a matter of safety for your boat. The most common option is black rubber on a metal or plastic core. Quality rubber should be labeled as resistant to ozone and UV radiation. Cheap counterparts are quickly covered by a network of cracks, crumble and stain the boat sides with black dust that is difficult to wash.
Polyurethane stops are considered more durable, they have high hardness, but they have sufficient elasticity. Polyurethane It is not afraid of fuel (gasoline, oil), which is important if the trailer is also carrying the engine. However, it should be borne in mind that polyurethane can be tougher than rubber, so the area of contact with the boat should be maximum.
Lubricate rubber stops with a special silicone lubricant before long parking (for the winter) to prevent drying and cracking of the material.
Plastic supports (from ABS or polyethylene) are less common, lightweight and do not rust, but can deform under load in hot weather. Uncoated metal stops can not be used categorically. If you do stops yourself, be sure to use a heat nozzle or multi-layer coating with carpet followed by impregnation with moisture repelling compound.
⚠️ Warning: Never use oil-based lubricants (solidol, litol) to lubricate PVC-contacted stops – they can chemically react with the boat material and soften it.
The table below compares the main materials used for the manufacture of supports:
| Materials | Wear resistance | Impact on PVC | Term of service |
|---|---|---|---|
| EPDM rubber | High. | Minimum | 5-7 years |
| Polyurethane | Very high. | Missing. | 7-10 years |
| Plastic (ABS) | Medium | Low. | 3-4 years |
| Wood (with cloth) | Low. | Risk of splinter/rot | 1 season |
Step-by-step instructions for installing stops
Installation of new stops requires accuracy and the presence of a basic set of tools: wrenches, drills (if you need to drill new holes) and a marker. First, you need to dismantle the old elements and clean the trailer frame of dirt and rust. If the old holes are rusted, they should be treated with a rust converter before installing new studs.
Set the central keel toe strictly along the trailer's symmetry axis. For boats with a rigid keel, the distance from the top of the keel to the frame should be such that the boat lies on the mounts, not on the metal frame. The gap between the frame and the bottom of the boat in the laden state should be 2-3cmThis will prevent the fabric from rubbing against the metal when vibrating.
☑️ Setting of stops
The side stops are set so that they touch the cylinders at their widest part, usually at the junction of the cylinder and the bottom. Don't tighten them too much, they should only touch the side slightly, fixing the position, but not compressing the cylinder. Excessive pressure at one point will lead to local thinning of the PVC material.
Once you have all the elements installed, check the boat, see if it's skewed, if the slings are the same, if the boat is crooked, maybe one of the stops is set above or below the rest, and the height adjustment is usually done by adding or removing the washers on the stud, or by rotating the adjustment glass.
Properly installed stops distribute the weight of the boat evenly, eliminating local pressure points that can cause the seams to rupture during transportation.
Adjustment of tension and height of supports
Adjustment is the finest stage of adjustment. PVC boats are dynamic, shaped by air temperature and cylinder pressure. In summer, in the sun, the pressure in the cylinders increases, and they become harder. In winter or in cool weather, the cylinders deflate. The pressures must be adjusted to these changes.
The optimal height of the center rest is experimentally selected. If the rest is too high, the bow of the boat will be uprooted, which will worsen the aerodynamics and create sailing. If it is too low, the boat will throng over the frame or winch mechanism, which is unacceptable. Use the level or laser level to test the horizontality of the bottom relative to the ground.
The side stops are regulated by the principle of "free passage". The gap between the side of the boat and the stop should be minimal, but allow the boat to "breathe" when the temperature changes. Check the adjustment after the first 50 km of run: the nuts may have weakened from vibration, and the stops have shifted. counternuts or a thread fixer to prevent spontaneous unwinding.
⚠️ Attention: When adjusting your height, consider the weight of the engine and fuel. An empty boat and a full tank and engine boat will lie at the stops at different angles due to the shifting center of gravity.
For trailers with breaking breather (folding) it is important to check the position of the stops in both positions: assembled and disassembled. Sometimes when folded, the boat may rest on the sharp edges of the folding mechanism if the stops are not properly exposed.
Maintenance and preparation for winter storage
Boat supports require minimal but regular maintenance, and after each trip on salty water or dirty roads, they must be washed with fresh water, and salt and road reagents accelerate the corrosion of metal studs inside rubber rollers, which can lead to the destruction of the cliff from the inside.
Before placing the trailer for winter storage, it is recommended to remove the rubber elements, if the design allows, or carefully preserve them. Metal parts are lubricated with a consistent lubricant. Rubber is better treated with silicone spray to maintain elasticity. Keep the removed stops in a dark room, since ultraviolet is the main enemy of rubber.
What if the stud is rusty and does not unscrew?
Wet the joint with a penetrating lubricant (such as WD-40) and leave it for a few hours. Try gently tapping the nut with a hammer through the embroidery to break the rust layer. If it doesn't, use a gas burner to heat the nut for a short time (carefully, don't damage the rubber and paint coating of the trailer!).
Check the condition of the fasteners regularly. A weak nut on the side stop can cause the boat to rub against the frame, rubbing the cylinder for a few kilometers. Visual inspection before each season is a mandatory procedure for the responsible boat owner.
If you notice that the rubber has begun to crumble or the surface has deep cracks, do not try to resuscitate the emphasis with sealant or tape. These are temporary measures that do not guarantee safety. Replace the worn element with a new one so as not to risk expensive property.
Frequently Asked Questions (FAQ)
How often should the tires be changed on the trailer?
The life of the trailer depends on the operating and storage conditions, and on average, high-quality rubber stops last 5-7 years, but if you keep the trailer in the open sun, you should replace it every 3 years or if there are visible cracks and surface stickiness.
Can I use the car rollers from the bumper as stops?
Technically, it's possible because the material is similar, but the shape of car rollers is often not optimal for fixing the boat, they can be too rigid or have an inappropriate bend radius, which will lead to a point pressure on the cylinder.
Do I need to smear the stops before loading the boat?
You don't have to lubricate the stops unless the boat gets stuck. You can use a soap solution or a water-based slippery liquid to make it easier to load, which is sprayed on the bottom of the boat or the stops themselves. You can't use oil lubricants.
What should be the height of the central support relative to the frame?
The main rule: when loaded (with engine and equipment), the boat should only touch the stops and should not touch the metal frame of the trailer even when shaking strongly.
Why does the boat slide back when braking, even though there are stops?
The central keel is likely to be too low or too weak (too smooth/worn) and the problem may be the weak tension of the winch belt, and the stress must create a mechanical barrier to prevent the boat from moving backwards inertially.