Inflatable transom-mounted swimmers are often tuned when owners decide to install a more powerful motor or simply want to improve the reliability of the design. The standard transom board, which comes as standard, is usually designed for short-term loads and low-power motors. Over time, under the influence of constant vibration and engine weight, the plywood can dissect and the skin lose its tightness, which poses a real threat to safety on the water.
The process of strengthening the transom requires careful approach to the selection of materials and adherence to technology, since this unit takes the main load when driving. Improperly performed modernization can lead to a shift in the center of gravity, deformation of cylinders or even break of mounts at the most inopportune moment. In this article, we will discuss all the steps of work, from dismantling the old board to finishing and installing additional rigidity elements.
Status analysis and selection of materials for reinforcement
Before any work begins, a thorough inspection of the current condition of the transom panel is necessary. Often the external integrity of the coating hides internal defects, such as plywood stratification or rotting of moisture-soaked wood. If you hear a deaf sound or bloating of the paint coating is noticeable, it is not necessary to reuse such a part, it is better to make a new base from better materials.
To create a reinforced version is ideal. plywoodThe thickness of the material directly depends on the power of the engine planned for installation: for engines up to 5 hp, 12-15 mm is enough, while for 10-15 hp it will take 18-21 mm. The use of conventional construction plywood is categorically not recommended, since it quickly absorbs water and loses strength specifications.
In addition to the base, a critical element is the outer coating, which protects the tree from aggressive aquatic environment, the best option is a combination of fiberglass and epoxy resin, which creates a durable composite layer. The alternative is to paint high-quality yacht varnishes in several layers, but this coating requires more frequent renewal and careful handling.
Dismantling the old transom and preparing the basis
The replacement process begins with the careful removal of the standard transom board from the boat's pocket. It is important not to damage the pocket and slings, so all manipulations should be carried out on a flat, clean surface, before pumping the boat cylinders to the working pressure to fix the shape. If the old board is boiling or stuck, you can not use brute force, you should use a soap solution to lubricate the contact surfaces.
Once removed, the dimensions and angles are measured precisely, because even a slight deviation can disrupt the boat's hydrodynamics. The new workpiece is cut with a 2-3 mm inlet, which is then sanded for a perfect fit. Particular attention is paid to the angles: they must be rounded with a radius of at least 10-15 mm, so as not to create stress points on the PVC fabric.
At this stage, the state of sling If the textile looks worn out, it makes sense to replace it with a stronger one, like a Kevlar sling or a high-strength polyester, which will ensure that the load is distributed evenly over the entire area of the transom's adjoining cylinders.
Technology of processing and protection of wood
The prepared plywood workpiece must be carefully treated to prevent moisture from entering the structure of the tree. The first step is to grind all surfaces with fine sandpaper to remove the pile and create roughness that improves adhesion, and then the wood is impregnated with special antiseptics for marine conditions that prevent mold and decay.
The most reliable method of protection is glass-fiber pasting. To do this, the surface is degreased, a layer of epoxy soil is applied, after which a layer of fiberglass is laid and impregnated with resin. After drying, the procedure is repeated 1-2 times, creating a monolithic protective shell. It is important to work at a temperature not lower than + 15 ° C and low humidity.
⚠️ Attention: Epoxy resin is toxic in liquid state, so all impregnation and pasting work should be carried out in a well-ventilated room using rubber gloves and a respirator.
The final step is to paint or varnish, and if you're planning to use the boat in difficult environments where you might hit rocks or logs, you'd better choose a matte, wear-resistant paint that will cover up the small scratches, and the glossy coatings look more aesthetic, but they're more visible than any damage.
The secret to the longevity of the transan
Plywood ends are the most vulnerable place. Before the main pasting, soak them with epoxy resin 2-3 times until the wood no longer absorbs the compound, which will prevent stratification along the edges in the future.
Strengthen fasteners and fittings
Standard screws and nuts that come with boats are often made of soft metal and are prone to corrosion. When the transom is strengthened, they must be replaced with stainless steel fasteners of the AISI 316 brand, which is resistant to salt water. The hairpin diameter must correspond to increased loads, usually the M8 or M10.
The key to strengthening is installation pinched Or nut plates on the inside and outside of the transom, which allows you to distribute the point pressure from tightening the nuts over a larger area, preventing plywood from pressing and deforming the pocket fabric, washers must have an area well above the area of the standard ones.
For additional fixation, you can use sealing sleeves that are installed in holes under the fastener, which prevent water from entering the transom board through bolt holes, which is especially important for long-term use in water.
Use spring washers under each motor attachment nut, which will prevent the fastener from unscrewing spontaneously due to the strong vibration of the engine while driving.
Installation of reinforced transom in the boat
The upgraded board is placed in a pumped boat, which ensures that the pocket is properly stretched, first the transom is inserted into the bottom of the pocket, then carefully straightened and pulled up to the full fit of the cylinders, and it is important to ensure that the fabric does not get jammed and does not form folds that can become wear points.
Fixing is done by tightening the nuts on the studs. Puffing should be done evenly, alternating the upper and lower mounts to avoid skewing the board. Excessive force during tightening is unacceptable, as it can damage the cylinders, but weak fixation will lead to a backlash of the engine.
After installation, it is recommended to check the angle of inclination of the transom relative to the bottom. For most PVC boats, the optimal angle is considered to ensure the horizontal position of the engine's lower unit when entering the planing. If necessary, the angle can be adjusted by adding gaskets between the transom and the cylinders, if the design of the boat allows.
☑️ Post-installation verification
Testing and operation
The first transom-enhanced waterway should be gentle, you need to gain momentum smoothly, controlling the behavior of the stern of the boat. The absence of creaks, backlashes and deformations indicates a quality work done. In the first hours of operation, you should periodically check the tightening of the fasteners, as new plywood can give a small shrinkage.
Regular care of the reinforced transom will prolong its life. After every fishing or walk, it is advisable to remove the board from your pocket, wipe dry and leave it for ventilation. Even the best protection does not like to be in water constantly, especially if these are fresh water bodies with high biological activity.
The table below shows the recommended parameters of transes for different engine power, which should be considered when planning gain:
| Engine power (hp) | Plywood thickness (mm) | Diameter of the fastener | Recommended material of coverage |
|---|---|---|---|
| Up to 5. | 12-15 | M6 - M8 | Yacht lacquer (3-4 layers) |
| 5 - 10 | 15-18 | M8 | Glass fabric + epoxy |
| 10 - 15 | 18-21 | M8 - M10 | Glass fabric (2 layers) + paint |
| 15+ | 21-25 | M10 | Glass fabric (3 layers) + paint |
⚠️ Warning: Exceeding the maximum permissible power of the motor specified by the boat manufacturer, even with a reinforced transom, can lead to rupture of cylinders in the aft part due to increased load on the structure.
Frequently Asked Questions (FAQ)
Can you use conventional plywood if you cover it with a large number of layers of paint?
The use of conventional plywood is highly undesirable even with a multi-layer coating; unlike marine, it has a lower quality gluing of layers and is more quickly destroyed by moisture through microcracks; savings on the base material can lead to sudden destruction of the transom on the water, which is life-threatening.
Do I need to take off the transom after every fishing trip?
To extend the life of the boat, yes, preferably, long periods of time in the water will cause the wood to swell and the protective coating to gradually break down. If you can't remove the transom, try not to leave the boat overnight and check the condition of the coating regularly.
Which epoxy resin is better to choose for processing?
For this purpose, any epoxy compositions labeled "wet surfaces" or "boats" are suitable. It is important to pay attention to the life of the mixture and the elasticity after curing. Too rigid a layer can crack on impact, so compositions with plasticizers are preferable.
What if the squirrel is still for an outboard motor?
A deflection indicates insufficient thickness of the plywood or violation of the reinforcement technology, in which case you need to reinforce the structure with additional stiffness ribs on the outside or replace the base with a thicker one. You can not operate a boat with a trunking transom.
Could the reinforcement of the transom affect the boat's warranty?
Yes, any design intervention, including replacing the standard transc by a homemade reinforced transc, is likely to result in a loss of warranty from the manufacturer, so it makes sense to upgrade on boats with an expired warranty period or if you are willing to take responsibility for the changes.
Properly reinforced transom is not only an opportunity to put a powerful motor, but also a margin of safety that guarantees your safety on the water in emergency situations.