Operation of inflatable boats rarely does not have to move along the shore, especially if we are talking about heavy models with an installed engine and fuel tanks. transom wheels They are one of the most useful accessories that make a heavy boat into a lightly controlled trolley, which is especially true when launching from a sloping or rocky shore. Proper installation of this equipment requires not only physical strength, but also an understanding of the design of the cylinders, so as not to damage the water. PVC material in operation.
Many owners mistakenly believe that it is enough to simply attach the brackets to the transom, but ignoring the nuances of the placement of the supports can lead to rapid wear of the bottom or cylinders. In this article, we will discuss in detail all stages of installation, from the choice of type of fasteners to the final protection of the points of contact with inflatable elements. The main technical task is to ensure rigid fixation of the wheels when moving and the complete absence of contact of metal parts with cylinders in the working position.
Choice of type of fastening and wheel design
Before you start mounting, you need to decide on the design of the wheels themselves, because it depends on the method of installation and the impact on the geometry of the transom. The market offers two main types of solutions: removable wheels on swivel brackets and stationary models that are attached directly to the transom board. Removable option is preferable for those who value aesthetics and do not want to weigh the boat during the course, since after launching the brackets can be removed.
The design of the rotary mechanism is also important. There are models where the wheels are folded up along the transom, and options where they are spread out to the sides. The first type is more compact, but requires careful adjustment of the height, so that in the raised position the wheel does not rub against the bottom of the boat. The second type is convenient in that when lifting the wheel automatically locks parallel to the transmolor, but requires more space in width.
- 🛑 Hard brackets require drilling of the transom, provide maximum reliability, but are not removed quickly.
- 🔄 Turning mechanisms - allow you to remove the wheels upwards, without removing them completely, convenient for frequent transportation.
- 🔩 Removable racks - are installed in special nests (lyras), require additional fasteners on the boat.
When choosing, you should also pay attention to the diameter of the wheels and the material of the tires. For sandy beaches and smooth concrete slips, smaller wheels with cast discs will suit. If you often have to drag the boat over rough terrain, grass or pebbles, you better choose models from the same range. pneumatic large diameter, which absorb irregularities and save the transom board from impact loads.
Required tools and materials
Well, you can't have a high-quality installation without the right tools, because you're working with composites and metal, you might not have a standard home craftsman's kit, and you'll have an electric drill with a set of metal and wood drills, and you'll have a high-quality drill. a polyurethane-based sealant that will ensure waterproof anchorages.
Special attention should be paid to fasteners. Standard bolts, which come with cheap wheels, are often made of soft steel and are susceptible to corrosion. Experienced water turbines recommend immediately replacing them with stainless steel fasteners brand. A4 (316) This will eliminate the rusting of the transom and the jamming of the nuts through the season.
☑️ List of tools for installation
To protect the cylinders from abrasion, you need a special tape or profile, often with rubber bumpers, but their effectiveness is questionable. PVC-ribbon Or use a high-strength transport tape to create a buffer between the metal bracket and the inflated chamber, and you'll also need a rag and a solvent to degrease the surface before applying the sealant.
⚠️ Attention! The use of acidic silicone sealants is strictly prohibited, they can cause a chemical reaction with the material of the transom board or cylinders, and also do not provide the necessary elasticity in vibration.
Marking and preparation of the transcoat board
The installation process begins with careful markings, and a mistake of several millimeters can cause the wheels to touch the cylinders when raised, or, conversely, to fall too low, clinging to the ground ahead of time, the boat must be inflated to the working pressure and set the transom upright, simulating the position during transportation.
First, the brackets are tried on without drilling. The middle ground must be found: the wheel axis must be above the bottom edge of the transom, but low enough to allow cross-country passability. The optimal distance is 5-7 cm from the bottom edge of the transom board to the center of the wheel in the lowered state. In the elevated state, the gap between the wheel and the cylinder should be at least 1-2 cm.
For accurate markings, use a ruler and a sharp marker. The drilling points are outlined through the holes in the bracket mount plate. It is important to check the symmetry of the markings on both sides of the transom, otherwise the boat will topping up as it moves along the shore. If the transom board is slanted (which often happens to improve hydrodynamics), the markings should be done with this angle in mind, so that the wheels stand vertically relative to the ground.
Before drilling, stick paint tape to the markings, which will prevent the drill from slipping and help you see the entry points clearly, and also protect the laminate from scratches.
Drilling and sealing technology
Drilling a transom board is the most important step, requiring care. Tram is a multi-layer sandwich made of plywood (usually marine), covered with fiberglass or laminate. To avoid chipping the outer decorative layer, you need to drill on both sides, using a smaller diameter drill for the through passage, and then drill to the desired size.
The hole diameter must be 1-2 mm larger than the bolt diameter to allow the space to be filled with sealant. After drilling, the edges of the holes must be cleaned with sandpaper and degreased. polyurethane sealant, which will fill all the voids and prevent moisture from entering the plywood, which is fraught with transom layering.
Sequence of action:Drill the hole with a 4-5 mm drill.
Drill to a diameter of 8-10 mm (under the bolt).
3. Clean the edges and degrease.
4. Fill the hole with sealant.
5. Insert a sealed bolt.
6. Set washers and tighten the nut.
The bolts are inserted with a sealant oil, werehed (preferably wide to distribute the load), and the structure is pressed against the transom. Excess sealant, protruding outside, you need to immediately remove with a spatula or a rag moistened in the solvent, forming a neat burtic around the fastener. Pluck nuts should be made evenly, cross-cross, if the attachment points are several, so as not to skew the plate.
Wheel installation and height adjustment
Once the brackets are securely attached to the transom, you can start installing the wheel assemblies themselves. Depending on the model, the wheel axis can be inserted into the groove of the bracket and fixed with a splint, or screwed with a bolt connection. It is important to make sure that the rotational axis does not have a backlash, but also is not clamped too tightly, which could make it difficult to turn the mechanism.
Altitude adjustment is critical. If the wheels are placed too high, they will become useless on soft ground, because the boat will lie on the transom before the wheel touches the ground. If it is too low, water resistance will increase and the risk of getting hooked on bottom obstacles during movement increases. In many models, height is regulated by shifting the axle into different openings of the bracket or changing the angle of the rack itself.
| Parameter | Recommended value | Effects of error |
|---|---|---|
| Axis height (from bottom of transom) | 50 - 70 mm | Bottom grazing or lack of contact with the ground |
| Clearance to cylinder (up) | min 15 mm | Erasure of the cylinder during vibration |
| Angle of wheel opening | 100 - 120 degrees | Instability during transportation |
| Diameter of the bolts of the attachment | M8 - M10 | Load cutting of thread |
Adjustment checks are best done under load. Lift the boat's nose, lower the transom on the wheels, and press on the stern. The structure should not bend, and the wheels should roll confidently without touching the inflatable elements. If you touch, you either need to change the angle of separation of the wheels or put on additional protective pads.
How to increase the permeability of the wheels?
If standard wheels are not enough to pass through deep sand, you can temporarily increase their diameter using the "wheel-in-the-wheel" method. To do this, a camera from a child's bicycle or even from a wheelbarrow is inserted into the main disk, pre-sized, this increases ground clearance and reduces ground pressure. However, this method is only applicable for short-term movements and requires reliable fixation of the inner chamber.
Protection of cylinders from abrasion
Even when perfectly adjusted, vibration when moving through irregularities can lead to contact of metal parts of the bracket or the wheel itself with cylinders. PVC fabric You need to have a strong defense, and simply sticking rubber pieces together is often ineffective, because they quickly detach from the moisture and the sun.
The most reliable way is to use a self-adhesive tape made of foamed polyethylene or a special transport tape with reinforcement, tape is glued all the inner surfaces of the brackets facing the cylinder, as well as the lower part of the transom in the area of possible contact. The layer of protection should be thick enough to exclude contact of metal and plastic even under severe compression.
⚠️ Attention! Check the condition of the protective linings regularly. The appearance of scuffs on the tape is a signal for immediate replacement, otherwise you will meet the season with a balloon wiped to the cord.
You can use it additionally. silicone lubricants In the friction areas (but not on the tape itself, so as not to disrupt the adhesion of the glue), which will reduce the friction coefficient. Some craftsmen install small floroplastic rollers on the brackets that take the entire load from the friction, keeping the balloon intact.
The quality of the cylinders is more important than the material of the wheels themselves: a cheap wheel can be replaced in an hour, and repairing a cylinder in the field is a complex and long procedure.
Frequent errors in installation
By analyzing the experience of boat owners, we can identify a number of common mistakes that are made when you install yourself: the first and most common is the savings on fasteners. Using conventional ferrous metal instead of stainless steel leads to the fact that after one season the bolts rust dead, and unscrewing the wheels becomes impossible without a Bulgarian and the risk of damaging the transom.
The second mistake is not sealing enough. Owners often seal only the bolt cap, forgetting that water penetrates through the drill channel deep into the plywood. This leads to swelling of the transom board, stratification and loss of strength. The third mistake is ignoring the nut tightening check after the first break-in. The nuts have the ability to unscrew under vibration, so after 10-20 km of run, you need to recheck all the connections.
- ❌ Use weak washers that are punched and cut into the trench.
- ❌ No gap between the wheel and the cylinder in the folded state.
- ❌ Installation of wheels without taking into account the angle of the boat's trim (the transom is littered back).
Also worth mentioning is the mistake of choosing the diameter of the wheels for a particular boat mass: Small wheels on a heavy boat with a 15 hp engine and a full tank will simply drown in sand or mud, turning transportation into anguish. Always choose wheels with a margin of payload.
FAQ: Frequently asked questions
Can you install transom wheels on a boat without drilling a transom?
There are wheel models that are attached to straps or brackets that span the transom, but they are less reliable, can shift under load and often scratch the lamination of the transom. For serious use, drilling and sealing are the only right solution.
How often should I change the sealant in the holes?
A high-quality polyurethane sealant (e.g., 3M 5200 or equivalents) lasts as long as the boat itself - 10-15 years. Preventive inspection is recommended once a season, checking the integrity of the burtic around the bolts. If the sealant cracks or has moved away, it needs to be updated.
Does the brackets affect the speed of the boat?
If the brackets in the raised position are tightly adjacent to the transom and do not protrude beyond its dimensions, the effect on hydrodynamics is minimal (less than 1-2 km / h). However, if the structure has protruding parts or poor streamlining, the loss of speed and increased fuel consumption can be noticeable.
What to do if the transom board has already layered in the places of fastening?
In this case, simply re-installing the wheels will not help: you need to dismantle the fastener, dry the transom, drill the damaged areas, soak them with epoxy and re-drill the holes with displacement, in critical cases, you need to replace the transmutation board.
Will the wheels from the garden trolley fit for the boat?
Theoretically, yes, if you can adapt the mounting. But garden wheels often have an open bearing that will quickly clog with sand and rust with salt water.