Operation of small-sized vessels is impossible without reliable transportation, and here the key role is played by the boat. jerseyThe owner of a boat often faces the dilemma of leaving the standard elements or replacing them with more suitable ones, since the factory equipment does not always take into account the specifics of the particular vessel. The correct selection of these elements is critical, because they take on the main weight of the hull in static and dynamics, protecting it from impact and friction.
In this article, we will discuss in detail the types of support elements, their design features and materials of manufacture, so that you can make an informed decision. MIZNA It uses standardized components, which makes it much easier to find parts, but the nuances of the geometry of the pawns require careful attention. Understanding the difference between hard and soft options will help to avoid chipping, cracking or denting on the bottom of your vessel during long trips along the track.
Misfitting supports can be a source of constant problems, from creaking while driving to serious damage to the body lining. A competent upgrade to the hull support system is an investment in the durability of your equipment, which will pay off with peace of mind on the water and during transportation.
Design features and types of rollers
The basis of any support system on a trailer is a metal or plastic sleeve mounted on the bracket, which takes over the load of the body. The design can vary depending on the purpose: for the bow, larger and stronger elements are usually used, and for the aft, specific guides. roller-geometry You should repeat the curves of the keel of your boat as accurately as possible to evenly distribute the pressure.
There are several basic forms of support elements, each of which solves its own tasks during transportation, and choosing the right shape directly affects the stability of the boat in the lodge and the ease of its removal on the water.
- 🔵 Cylindrical (drum) - a classic version with a flat working surface, providing stable support for flat sections of the bottom.
- 🔺 V-shaped (conical) - ideal for fixing the keel, preventing lateral displacement of the vessel during cornering.
- 🔷 Multifaceted - a compromise solution that combines the properties of cylindrical and conical shapes for universal application.
The fastening is done by means of a bolt connection through an axis that passes through the center of the element and is fixed by nuts on both sides of the bracket. MIZNA Most often it is 25 mm or 30 mm, but before buying spare parts, be sure to measure with a rod. The discrepancy in the diameter of the axis even by a few millimeters will make installation impossible without serious revision of the brackets.
⚠️ Note: When installing new supports, make sure that the axle does not protrude beyond the dimensions of the bracket by more than 5 mm on each side to avoid touching the sides of the boat during loading.
Materials of manufacture: plastic, rubber or polyurethane
The choice of material is perhaps the most important step in the modernization process, as it is the most important step in the protection of the boat's coating. Factory kits are often equipped with hard plastic, which is cheap to produce, but not always optimal for expensive gelcoats or aluminum alloys. polymer offer significantly better shock absorbing properties, absorbing vibrations of the roadway.
Rubber supports are traditionally considered the most gentle for the housing, providing excellent grip and minimizing the risk of scratches. However, rubber tends to age under the influence of ultrafilter and ozone, eventually losing elasticity and beginning to crumble, which requires regular replacement. Plastic, in turn, is more durable and resistant to chemical influences, but can be too rigid for a thin bottom.
Effects of Temperature on Materials
At extremely low temperatures, some rubbers can bluff, losing their shock absorbing properties and becoming hard as stone. Plastic, on the contrary, can become more brittle and prone to splitting on impact. Polyurethane mixtures often exhibit the best stability of properties over a wide range of temperatures.
Polyurethane and specialty rubber blends are the middle ground, combining the wear resistance of plastic with the elasticity of rubber. These materials are often used in premium water accessories. When choosing, consider the labeling of the material: if the surface is already visible microcracks or sticky to the touch, it is best not to install such an element.
Comparative table of material specifications
To make it easier to choose, we have systematized the basic parameters of popular materials used in the production of support elements, and this table will help you quickly navigate the advantages and disadvantages of each type.
| Parameter | Hard plastic | Technical rubber | Polyurethane |
|---|---|---|---|
| Protection of coverage | Medium | High. | Very high. |
| Wear resistance | High. | Medium | Very high. |
| Resistance to UV | High. | Low. | High. |
| Term of service | 5-7 years | 3-5 years | 7-10 years |
As you can see from the data, polyurethane The price of rubber is more expensive, but it remains popular because of its availability and time-tested efficiency, especially for heavy boats where inertial softness is important, and plastic is a budget option, or for boats with a very strong metal bottom, which is not afraid of small vibrations.
The optimal choice for most owners of PVC boats and boats with gelcoat coating will be supports made of polyurethane or soft rubber with a high rubber content.
Diagnosis of wear and the need for replacement
Regular inspection of the support elements should be a mandatory part of the preparation for the season. Ignoring signs of wear can cause the metal frame of the bracket to contact the hull of the boat, which is guaranteed to lead to damage. Visual inspection allows you to identify the initial stages of degradation of the material before they become critical.
Note the following signs that indicate an urgent need for replacement:
- 🔴 The appearance of deep cracks, chips or detachment of pieces of material from the base.
- 🟠 Geometry change: flattening, curvature, or loss of the original shape of the cylinder.
- 🟡 Excessive backlash: if the roller hangs on the axis even with tight nuts, then the internal landing hole is broken.
Especially carefully check the condition of the supports in the bow, where the concentration of the mass of the boat is maximum. contact-area If you notice that the boat has become worse fixed in the transport position or there is a characteristic knock when moving, start your diagnosis with checking these nodes.
Often, owners forget to check the condition of the axles and fasteners themselves. Corrosion can eat the thread or make the axle stationary, making it difficult to replace it. Preventive lubrication of threaded joints and visual control of the metal of the brackets will extend the life of the entire support system.
Instructions for replacing rollers on the trailer of MWSA
Replacement process of support elements on trailers MIZNA It is simple enough and does not require a specialized tool, but requires carefulness. Before starting work, make sure that the trailer is on a flat surface and securely fixed to prevent its accidental displacement.
☑️ Preparation for replacement
The first thing you need to do is to free up access to the brackets, and if the boat is on the trailer, you have to either take it off completely or lift it up with extra stops to take the load off the replacement elements, then unscrew the nut on the axle, remove the locking washer (if there is one), and dismantle the roller itself. If the axle is rusted and doesn't turn, you have to load the connection with penetrating lubricant and give it time to act.
Install the new element, making sure it rotates freely on the axis, but does not have excessive backlash. Tighten the nut with the recommended effort: the pull can deform the inner sleeve and make it difficult to spin, and the tightening will lead to a beat. After installing all new components, it is recommended to conduct a test trip followed by re-monitoring the tightening of the fastener.
When assembly, use graphite lubricant on the axis thread - it will prevent nuts from coming to the core and make maintenance easier in the future, unlike litol, which can be washed out.
Load positioning and adjustment
Simply replacing worn parts is not enough – it is important to correctly set their position relative to each other. Symmetry of location The hull is critical to evenly distribute the weight of the boat, and if one side is leaning harder than the other, it will cause the hull to skew and create stress points.
Adjusting the height of the brackets allows you to adapt the trailer for boats with different heights or bottom shapes. MIZNA Often it is possible to change the height of the pawns by rearranging the fasteners or using adjusting washers. Make sure that all supports touch the body simultaneously and with the same force.
⚠️ Warning: Never allow a situation where the boat relies only on the nose and transom rollers, leaving the middle part on the weight - this can lead to deformation of the keel during transportation.
You can use a shaming technique to fine-tune it, apply a thin layer of chalk or soapy water to new rollers, set the boat up and sway it a little bit. Contact marks will show which points carry the main load and where bracket positioning needs to be adjusted. The ideal is when the prints are uniform across the support area.
Maintenance and storage
The durability of rollers depends not only on the quality of the material, but also on the conditions of use and storage. After each release, especially in salt water, it is recommended to rinse the supports with fresh water to wash away salt and dirt, which can act as an abrasive. The accumulation of sand between the roller and the axis accelerates the production of the landing site.
During winter storage, the trailer is best kept under a canopy or in a garage to minimize the impact of ultraviolet light on rubber and polyurethane parts. If this is not possible, you can use protective covers or simply cover the area of the pawns with a dense cloth. Regular lubrication of the axles with lithium lubrication will also prolong their life and preserve the mobility of the knots.
Timely maintenance of the hull support system is the key to the safety of your transportation, and you should not save on these components, because the cost of repairing a boat is many times higher than the cost of even the most expensive rollers.
Frequently Asked Questions (FAQ)
Can I use wooden bars instead of regular rollers at the MZSA?
Theoretically, you can, because wood is softer than metal, but it's a temporary solution: the tree quickly absorbs moisture, swells, rots and loses shape, which can lead to instability of the boat when moving. In addition, untreated wood can contain knots that will damage the coating.
How often should I change the trailer?
The life of the product depends on the material and the conditions of use. Rubber is recommended to be changed every 3-4 seasons or when cracks appear. Plastic and polyurethane can last 5-7 years or more. Regular visual inspection is mandatory before each season.
Will the other trailers be suitable for the MZSA?
The MHSA uses standard axle dimensions (generally 25 mm and 30 mm) and bracket spacing. If the geometric dimensions and the landing diameter are the same, installation is possible. However, it is better to use original parts or certified analogues that guarantee compatibility.
Do I need to lubricate the rollers themselves?
You can't lubricate the roller surface that comes into contact with the boat, because it will pollute the hull and reduce friction, which is dangerous when loading, and only the rotational axis inside the sleeve is lubricated to prevent creaking and corrosion.