Operation of an inflatable vessel often leads to the need to upgrade staff units, especially if the initial specifications no longer meet the increased needs of the owner. sink-boardIt's a sleeve that takes on vibration, engine weight and hydrodynamic drag when glides, and over time, even a good factory assembly may require intervention to eliminate the risk of breaking the engine mounting assembly on water.
There are several reasons for the reinforcement work, from the banal desire to increase the safety margin to the need to install a more powerful power unit. Owners often find that regular plywood begins to layer or deform under the influence of moisture and loads. transprancing It is not just a tuning, but a vital procedure for the safety of the crew.
In this article, we will discuss the proven techniques that will allow you to turn a standard inflatable boat into a reliable vessel that can withstand severe loads. You will learn which materials really work in an aggressive aquatic environment and which are better to avoid.
Diagnosis of condition and choice of materials
Before purchasing components, a thorough review of the current state of the transomb is required. Often, the external integrity is deceptive, and hidden defects are only visible when dismantled or compressed, and the main enemy is moisture, which penetrates through microcracks in the paintwork and destroys the structure of the wood.
The key to choosing a reinforcement material is moisture resistance and mechanical bending strength. Standard FC or FSF plywood can be used, but only if the ends and surfaces are perfectly insulated. However, for maximum results, professionals recommend paying attention to aviation plywood or special composite panels.
⚠️ Warning: Never use conventional furniture plywood or chipboard to strengthen the transom. These materials are hygroscopic and lose up to 80% of their strength when wet, turning into porridge in one season of active use.
When selecting components, you should also consider the weight of the future design, because excessive stern mass can disrupt the differentiation of the boat. Too heavy transom will cause the boat to peck nose on the move, which will worsen handling and increase fuel consumption. gold-rule any water motor.
To clean and protect wood, you need epoxy resin with the right hardener, and fiberglass or carbon mats. It's important to choose low-viscosity resins for better fiber impregnation. The savings in chemistry are not acceptable, because it creates a barrier that protects the tree from water.
Surface preparation and dismantling technology
The reinforcement process begins with the complete removal of the trans plate from the pockets of the boat. PVC It requires careful unsticking of the slings or embroidery of reinforced seams, in others it is enough to just pull the insert out, and the main thing at this stage is not to damage the fabric of the cylinders, so all work is done on a flat, clean surface without sharp objects.
Once the plywood is removed, the old lacquer, paint and soaked layers are completely stripped. If the wood has blackened or signs of rotting, the affected areas are removed to a healthy massif, the surface must be completely dry and defatted before any new formulations are applied.
☑️ Preparation of the transanche for reinforcement
The geometry of the stove should be perfect, any distortions will lead to uneven distribution of load on the motor fasteners. If the regular plywood is not thick enough, it can be added to the extra layers, creating a sandwich design. The ends of the stove are the most vulnerable place, so they are given special attention in grinding and preparation.
For better adhesion of the epoxy resin to the tree, it is recommended to slightly skin the surface with fine sandpaper, which will create microroughnesses that will ensure the adhesion of the materials. The dust after grinding is carefully removed by vacuum cleaner or compressed air, as any inclusions reduce the strength of the connection.
Amplification methods: sandwich and composites
There are several proven ways to increase the strength of the transmutation unit, each with its own advantages, the most common method is to create a multi-layer sandwich, where layers of plywood alternate with reinforcing materials, which works as a single monolith, spreading the load throughout the area.
Modern materials allow for carbon fiber fabrics, which, when they're light, give you tremendous tensile strength, but the cost of carbon fiber is high, and for most amateur boats, there's enough fiberglass, and it's not just the make of the material that matters, but the correct stacking of the layers with overlap.
Secrets of working with epoxy resin
Working with epoxy requires strict adherence to the temperature regime. At temperatures below +15 ° C, polymerization may not begin or pass completely, leaving a sticky layer. The ideal temperature for work is +20..+25 ° C. If the room is cold, use a heat gun or place the workpiece in an improvised polyethylene greenhouse with heating.
When layers are formed, it is important to avoid air bubbles, which become centers of tension and fracture, each layer of fiberglass is carefully rolled with a roller, squeezing out the excess resin and ensuring a tight fit, the number of layers is calculated based on the required thickness and power of the engine.
An alternative is to install a metal frame or stainless steel linings, but this method is not suitable for all designs. Metal can create stress concentration points in the soft material of cylinders, so composite solutions look more preferable. The flexibility of the composite allows it to work on bending along with the PVC fabric.
Protection against moisture and rotting
Even the best reinforcement doesn't make sense without reliable waterproofing, because water will find its way to the wood. The main method of protection is to create an impermeable coconut of epoxy resin that completely seals the tree from all sides. The resin layer must be thick enough to prevent mechanical damage during installation.
Plywood endes require particularly careful processing, often in several steps with intermediate drying. You can use special antiseptic impregnations before applying the main layer, but they must be compatible with epoxy compounds. Chemical incompatibility can lead to detachment of the coating.
For additional protection, some craftsmen use leaf lead or special tread linings in the engine attachment areas, which prevents the wood from being pushed through by trans-gaca bolts, and regular inspection of the coating after each season helps to detect microcracks in time.
⚠️ Attention: When grinding hardened epoxy resin, fine dust is produced, which is a strong allergen. All the work on machining the frozen composite is done only in a respirator and protective glasses.
If the boat is kept in the sun without a cover, the degradation of the binder is faster, and the use of light-stabilized varnishes prolongs the life of the coating.
Tools and consumables
To do the work of strengthening the transom, you need the minimum set of tools that most home craftsmen have, the quality of execution depends on the accuracy of compliance with the technology and materials used, and you should not replace specialized components with analogues with unknown specifications.
Below is a table of the basic materials required for the standard procedure of strengthening the transom node of the medium boat.
| Materials | Appointment | Approximate expense |
|---|---|---|
| Phanera FSF/Bakelite | The transom base | 1 sheet (depending on size) |
| Glass fabric (200-300 g/m2) | Reinforcement | 2-4 linear meters |
| Epoxy resin | binder | 1.5 - 2.5 kg |
| Acetone/Solution | Degreasing | 0.5 litres |
| Sandpaper | Grinding | P-80, P-120, P-240 |
In addition to basic materials, you will need brushes for applying resin, rollers for rolling layers and containers for mixing components. Tools must be clean and dry, water entering the mixture of epoxy is unacceptable. To accurately dosing the hardener, it is desirable to have an electronic scale.
Use disposable cups and brushes from the hardware store - they are easier to throw away after work than to wash. Epoxy resin is hardly removed from the tools after solidification.
Assembly and installation of reinforced transone
Once the reinforced plate has been completely dryed and polymerized, it is then re-installed back into the boat, and it is important to follow a sequence of steps so that neither the new design nor the cylinder fabric is damaged, and it is best to install it at a plus temperature when the PVC material is most elastic.
The transom's pockets must be tight, free of backlashes, but also free of excessive tension, which can break the seams. If the design of the boat involves sticking a transmolant, use a special glue for PVC, compatible with the fabric of the boat, the chemical reaction must take place in a well-ventilated room.
The final step is to test the geometry and test the loading knot, make sure that the transom plane is perpendicular to the bottom, otherwise the boat will lead away when moving, and properly installed reinforced transom becomes a guarantee of stability of the course.
The quality of the transom gain is determined not by the thickness of the plywood, but by the quality of waterproofing and the absence of voids in the reinforcing layer.
Frequently Asked Questions (FAQ)
Can you make a squirrel without taking it out of the boat?
In theory, it's possible, but it's not recommended that you do it, because you need access from all sides to make sure that you can treat the ends and you need a monolithic layer of protection, and you can't work inside your pockets to ensure that you have the adhesion and quality control that you need, and that will cause the tree to rot quickly.
How long does the epoxy dry when amplified?
The initial grip time is about 24 hours at +20°C, but full polymerization and maximum strength gain take up to 7 days.
Will the boost affect the boat’s load capacity?
Yes, the weight of the structure will increase by 3-5 kg depending on the materials used, which will have a slight impact on the overall load capacity, but may require adjustments to the pressure in the cylinders or the distribution of the load to maintain driving performance.
Do I need to remove the old lacquer before strengthening?
The old coating prevents the tar from entering the wood structure and does not provide reliable adhesion. All layers must be applied to a clean, low-fat and skinned surface of the tree.