The PVC inflatable boat is a versatile craft that, when properly equipped, can replace heavy boats, but the key element that turns an inflatable rubber band into a full-fledged motor boat is the ability to make a boat that is designed to be a fully-fledged. turretIt's this part that takes all the load from the engine's traction and the weight of the outboard motor.
Many beginners underestimate the importance of the quality of this part, relying on regular components. In reality, it is the transom that often becomes the weak link if you do not pay attention to its materials and how it is fastened. Incorrectly selected or installed transmuter can lead to engine failure, damage to cylinders and even a water emergency.
In this article, we will go into detail all aspects, from the choice of material to the nuances of structural reinforcement, you will learn how to distinguish a quality product from a defective one and why. prairie It may be better than the scalp in certain operating conditions.
Design features and types of transom
The main purpose of the transom is to provide a rigid vertical plane for attaching the outboard motor. In inflatable boats that do not have a rigid hull in the aft, this function is performed by a special plate. There are two main types of designs: cut-in and hinged.
The cut-in transom is integrated into the design of the cylinder or bottom, a rigid plywood or composite plate glued into PVC fabric, which provides high rigidity, but increases the weight of the boat when assembled and complicates packaging, a solution often found in models that are initially sharpened for powerful motors.
The hinged version is a removable structure that is attached to the cylinders with belts and slings, a more versatile solution that allows you to use the boat both for an outboard motor and under the paddle without unnecessary weighting, but the reliability of the attachment here depends on the quality of the fittings and the correct tightening of the belts.
When choosing a hinged model, you should consider that the tension of the belts requires regular checks. Vibration from the running engine can gradually weaken the fixation. The cut-in structures do not have this drawback, but they are more difficult to replace in the event of damage without professional repair.
Materials of manufacture: plywood, aluminum or composite
The durability of the transom is directly dependent on the material from which the power part is made. plywoodIt's a multi-layered material soaked in water-resistant adhesives, making it moisture-resistant, but not permanent.
Aluminum alloys such as duraluminium are used to create lightweight and non-rusting structures. Aluminum transom is much lighter than a plywood counterpart of the same strength as is critical for portable boats. However, the metal transmits vibration faster to the boat hull and can have a higher cost.
Modern composite materials and fiberglass are gaining popularity, combining lightness, high strength and absolute water resistance, the composite does not rot, does not delaminate and does not require additional processing, making it an ideal choice for those who keep the boat in an inflated state or in high humidity.
Why isn't regular plywood suitable?
Conventional building plywood, when in contact with water, quickly gains moisture, swells and loses strength, and after a season of use, such a transom can delaminate under the load of the motor, causing the engine to fall into water.
The ends of the plate should be protected with epoxy resin or special paint. If you notice that the material has begun to "fluff" or changed color, urgent restoration of the coating is necessary.
Technical requirements for hinged transverses
The hinged transom must withstand not only the static weight of the motor, but also the dynamic loads when traveling along the wave. loading capacity And the tilt angle of the lower unit, and most manufacturers regulate the maximum weight of the motor that can be suspended on a particular model.
The design of the hinge element usually includes a vertical board, horizontal supports (legs) and a mounting system. The supports must have a sufficient contact area with the cylinders to avoid pressing PVC under the weight of the engine. The use of narrow slats without expansion heels is unacceptable.
The belts must be made of a strong sling, resistant to ultraviolet and salt water. The fittings — buckles and carbines — must be made of stainless steel or high-strength plastic. Cheap metal will quickly corrosion and can burst at the most inopportune moment.
Tweezing angle is another important parameter. Standard angle is 10-15 degrees. If the transom is too vertical or, conversely, has a heavy blockage, it will lead to improper dip of the screw and loss of speed or "goat" the boat.
Use microporous rubber gaskets between the wooden support legs of the transom and the boat cylinders, which will reduce friction and prevent damage to the PVC tissue when vibrating.
Transpranse reinforcement and load distribution
The standard transes on budget boats are often a bit weak for medium-powered engines. reinforcementThe simplest and most effective way is to install additional rigid inserts or "pyataks" in the places where the transom legs are attached to the cylinders.
To distribute pressure, you can use additional inflatable cans of pontoons attached to the sides in the aft section, which take on some of the weight and stabilize the boat, preventing excessive submersion of the stern, especially when installing motors over 5 hp on boats up to 3 meters long.
Internal reinforcement of the plywood shield is possible by gluing additional layers of fiberglass on an epoxy basis, which increases the thickness and rigidity of the board, preventing it from bending for an outboard motor stop, but it is worth watching the overall weight, as excessive weighting of the stern will worsen the driving performance.
☑️ Checking the transom readiness for the season
There's a method of placing stretch marks from the transom to the bow of the boat or to the fries on the sides, which creates a rigidity triangle and prevents the transom from falling forward under load, stretch marks must be adjustable so that the inclination angle of the lower unit can be accurately set.
Comparison of specifications of different materials
To make the choice easier, consider a comparative table of the main materials used in the manufacture of transoms, each with its own advantages and disadvantages, which can be decisive depending on the operating conditions.
| Materials | Weight. | Moisture resistance | Price. | Durability |
|---|---|---|---|---|
| Sea plywood | Medium. | High (with processing) | Low. | 5-7 years |
| Aluminum (D16T) | Low. | Great. | Medium | 10+ years |
| Fiberglass | Low/Mediocre | Perfect. | High. | 15+ years |
| Ordinary plywood | Medium. | Low. | Very low. | 1 season |
As you can see from the table, the material savings in the case of conventional plywood result in a rapid loss of functionality. Investments in aluminum or fiberglass pay off with a lifetime, especially if the boat is often left on the water or stored in an unheated room.
It is also worth noting that composite materials allow for complex geometric shapes, which is not possible when working with metal or wood without special equipment, which opens up the possibility of creating ergonomic transverses with built-in fastening elements.
Rules for safe operation and maintenance
Safety on the water is priority number one: operating an inflatable motorized boat requires compliance with a number of rules regarding the condition of the transom, first of all, before each fishing, you must visually inspect the belt attachment and the condition of the board itself.
Never exceed the maximum power allowed by the boat manufacturer. Re-move It's causing transoms to overload, it's causing the boat to roll at the stern, and it's a risk of being overwhelmed by the wave, and it's not just a recommendation, it's a matter of your life.
⚠️ Warning: If you see even the slightest creak at the place where the motor is attached to the transom, stop immediately. Scrip signals the metal to friction against the metal or wood, which can lead to rapid destruction of the mounting hole or breakage of the rod.
After each operation, especially in salt water, the transom must be washed with fresh water. The salt aggressively affects the metal parts of the fittings and PVC adhesives. The structure should be dried in the shade, avoiding direct sunlight, which can overdry the wood or deform the plastic.
Regular lubrication of rubbing metal parts (axes, bolts) with silicone grease prolongs the life of the transom and prevents acidification of compounds.
It is better to store the hinged transom in a disassembled or weakened state to relieve stress from the belts and PVC fabric of cylinders. Prolonged storage of the boat in a strained state leads to loss of elasticity of materials and the appearance of microcracks.
Frequently Asked Questions (FAQ)
Can the engine be more powerful than the factory recommends if the transom is strengthened?
Theoretically, you can make it stronger, but it violates the warranty and can be dangerous, because the boat is designed to handle a certain load not only of the transom, but also of the entire structure of the cylinders and seams, and exceeding the power of the motor changes the fluid dynamics and can lead to joints rupture or overturning.
How often should the scalp be changed?
Life depends on the material and maintenance: marine plywood, when properly stored, lasts 5-7 years, aluminum and composite for decades. Change the transom when cracks, stratifications or deformities occur that affect the angle of installation of the motor.
Why does the engine “bit” the gas on the transom?
This is a common problem with a transom that's not hard enough, and under load, the board flexes, changing the angle of the lower unit, the screw comes out of the water, the revolutions rise, then the board straightens, the screw sinks, and the jerk happens, and the solution is to install a hard transom, or slow down.
Do I need to remove the transom while storing the boat in assembled form?
If the boat is kept inflated for a long time, the transom is better removed or loosened belts, which will relieve the constant load on the PVC fabric in the contact areas and prevent the cylinders from deforming under the weight of the structure.