Operating an inflatable vessel without the ability to install an outboard motor significantly limits its functionality, turning useful transport into a conventional rowing vessel. Many owners of budget models or homemade structures face the need to strengthen the stern part to fasten the power unit. transom hanging It is a critical element, the reliability of which depends not only on the efficiency of the course, but also the safety of the crew on the water.
The process of installation of a stationary or removable transom requires careful preparation of materials and compliance with gluing technology. PVC fabricMistakes in the marking or degreasing phase can lead to the detachment of the reinforcement tape under the load of the screw. In this article, we will discuss in detail how to choose the right installation site, prepare tools and perform work so that the unit can withstand the vibration and thrust of the motor of any power.
You should immediately decide what type of design you want to implement. There are two main approaches: sticking a transom plate directly into the cylinder or creating a strung system on stringers. The first option is more reliable for constant loads, the second is versatile, but requires a perfectly flat bottom. Polyvinyl chloride, from which the cylinders are made, has excellent adhesion to special adhesives, which allows you to create compounds stronger than the base material itself.
Selection of materials and preparation of tools
Before the work begins, a complete set of materials must be collected, since interruption of the gluing process is unacceptable. The main element will be the transom plate itself, which is usually made of moisture-resistant plywood of the FFS brand with a thickness of at least 12-18 mm. graffiti from dense PVC fabric (usually 650-850 g/m2), which distributes the load over a large area.
A key component of success is the selection of adhesives. two-component polyurethane-based products are characterized by high strength and heat resistance, but they require precise compliance with the mixing proportions. Texacoll or KleybergYou'll also need degreasing solvents, rollers, and a dryer for thermal activation.
- 🛠️ Tools: industrial dryer, rubber rollers, scissors, brushes, sandpaper.
- 🧪 Chemistry: two-component glue, degreasing agent (acetone or special solvent), primer.
- 📏 Expenditure: Paint tape, marker, plastic film for protection.
It is important not to skimp on the quality of plywood, as ordinary building moisture will quickly destroy the layered structure. If you use plywood that is not coated with laminate, it must be soaked with oliph or special water-resistant varnishes in several layers. Only moisture-resistant plywood of the FFS brand is able to withstand constant contact with water for years without stratification.
Marking and preparation of the cylinder surface
The quality of the bonding depends on 90% of the surface preparation, you have to choose a flat area on the tank where the transom will be located, often you have to partially blow the cylinders to straighten the folds, the surface is thoroughly cleaned of dirt, dust and factory lubrication, then mechanically stripped (wounding) with abrasive, which increases the area of contact of the glue with the material.
After machining, chemical preparation is followed, degreasing is done carefully, but without fanaticism, so as not to damage the top protective layer of PVC. The degrease surface is marked according to a drawing or a template. transom tape must close the place of gluing the plate with a margin of at least 5-7 cm on all sides for reliable fixation.
Before applying the glue, warm the balloon and the tape with a hair dryer to 40-50 degrees - this will improve the penetration of the glue into the tissue structure and accelerate the polymerization process.
When marking, it is important to consider the angle of inclination of the engine's lower unit. If the transom is glued too vertically or with a reverse tilt, the boat will either burrow its nose or snooze it, which will reduce speed and handling. Use a transporter or a ready-made template for accurate positioning. The wrong angle of the trim cannot be fixed without completely re-adjusting the knot.
⚠️ Attention: Do not work on gluing at temperatures below +15 ° C or at high humidity. Condensate, protruding on the surface of PVC, will sharply reduce adhesion, and after a short time the transom will begin to peel under load.
Technology of cutting and processing of transom plate
A tray plate is a force element that senses the entire propeller's thrust, and it uses moisture-resistant plywood that is cut down the contour of the stern of the boat or made rectangularly shaped with rounded corners, and the plywood edges must be carefully ground and rounded so that they don't cut the cylinder fabric from the inside and out, and sharp edges are the main enemy of tightness.
Wood must be preserved from water, so that the plywood is soaked in oliphide, hot oxide, or coated with several layers of epoxy, and the ends are given special attention because it is through them that moisture penetrates into the material, and after drying, the surface is sanded with fine sandpaper to create roughness that improves glue adhesion.
| Parameter | Recommended value | Note |
|---|---|---|
| Plywood thickness | 12 - 18 mm | Depends on the power of the motor. |
| Mark glue. | Two-component polyurethane | For example, Teknipol or Kleyberg. |
| Sticking temperature | +20... +25 °C | Optimal Polymerization Mode |
| Time to dry | 24 - 48 hours | Full load. |
If you install prairieThe plywood is also fitted with metal or plastic straps to hold the rods, which must also be protected from corrosion because salt water quickly destroys the normal metal. Use AISI 304 or 316 stainless steel for fasteners.
Can I use epoxy glue for PVC?
Epoxy adhesives are not designed to glue PVC fabrics; they form a rigid, inelastic seam that will burst when the cylinder is deformed. PVC only uses special adhesives based on polyurethane or chloroprene rubbers, which remain elastic after drying.
Transpant bonding and installation
The most important step is direct gluing. The glue is applied with a brush or roller on both surfaces to be glued: on the prepared area of the balloon and on the back of the transom tape (or the stove itself, if it is glued directly), the first layer is often rubbed into the fabric, the second is applied 10-15 minutes after drying the first one (time depends on the instructions for the specific glue).
After the second layer is applied, you have to wait until the adhesive stops sticking to your fingers, but it keeps sticky. Then the surfaces are connected. It's important to avoid air coming under the tape. It's important to roll with a hard rubber roller from center to edge, squeezing out the air bubbles. The pressure has to be uniform and strong.
- 🌡️ Thermoactivation: The gluing place is warmed up with a hair dryer to 60-70 ° C to activate the glue.
- 🔨 Ride: Intensively roll every centimeter of the seam.
- 🕰️ Fixing: Install the cargo or use rods (through the gasket) for 12-24 hours.
If you glue a transom tape, it's then fixed to the cylinder, and then the plywood plate is applied, and in some designs, the tape has a pocket where the transom is inserted, and in others, the plate is glued over the tape. Seam tightness It's visually checked, so there's no bloating, no proglysis, no wrinkles, and any fold on the tape will be a point of tension where the joint will break.
⚠️ Attention: When using two-component adhesives, the mixture remains viable for only 40-60 minutes. Do not cook too much glue immediately so that it does not begin to polymerize in a jar before applying to the material.
Seam sealing and finishing
After the glue seam has completely dried out (usually after 24 hours), a joint audit is required, and often there are microscopic gaps along the perimeter of the glue, where water can flow, causing the plywood to rot from the inside. liquid or an additional layer of glue, which is applied with a thin brush along the contour of the connection.
Finishing also includes checking the geometry of the plant. Make sure the transom is strictly perpendicular to the diametrical plane of the boat. The skews will lead to the boat sideways when moving. If you used plywood without factory coating, it is recommended to paint it bright or varnish it for additional visual protection and aesthetics.
☑️ Checklist after installation
To increase the durability of the knot, additional protective elements can be installed, such as tubular rubber trays on the sides of the transom, which will take the blows when mooring, especially for boats that are often used on rocky shores or in conditions of heavy chop. Protective buffer It will extend your life for several seasons.
Typical errors and ways to fix them
One of the most common mistakes is not enough surface degreasing, and the PVC fabric in the factory prevents the glue from entering, and after a week of operation, the transom simply departs. If you notice deflection during operation, don't try to glue the tape over it -- you need to completely remove the layer, clean it up and degrease the surface.
The second mistake is saving on the area of the sticker, and some craftsmen stick only a narrow strip of cloth, believing that this is enough, and under the load of the motor, the contact area should be maximum to distribute the force. transom tape It should go on the sides and bottom of the balloon, creating a kind of "fart".
- ❌ Hurry: Beginning of operation before the time of complete polymerization of the glue.
- ❌ Dirt: The ingestion of dust or villi between layers of glue.
- ❌ Temperature: Work in the cold or under the scorching sun (direct rays).
If the error has already been made and the transom has begun to move away, do not panic. The damaged area is carefully cut off, cleaned, and the gluing procedure is repeated with the imposition of a new larger amplifier that overlaps the old seam. Repair is possible in the field with a remix, but it is better to perform it in the workshop.
The main secret of success is not the brand of glue, but the careful preparation of the surface (cleaning and degreasing) and compliance with the temperature regime during gluing.
FAQ: Frequently asked questions
Can I glue a transom on a single-component glue?
Technically possible, but the reliability of such a compound will be much lower: single-component adhesives (based on chloroprene) dried longer and do not provide the same tensile strength as two-component polyurethane compounds.
How long after the coupling can I put the motor?
Primary grip occurs after 2-4 hours, but the full strength of the glue gains after 24-48 hours at a temperature of +20 ° C. In cold weather, the polymerization time increases. Do not load the transom ahead of time, so as not to disturb the structure of the seam.
Do I need to reinforce the place of gluing with a grid?
In most cases of using standard transom tape (PVC reinforced) additional reinforcement with the mesh is not required. The mesh is used for repairing large gaps or in places of extreme loads, but for the regular installation of transmolina enough high-quality tape and glue.
What if the squirrel starts to “walk” during the process?
This is a sign that the glue has not withstand dynamic load or technology has been disrupted, that you must immediately stop operation, remove the engine and make a defective seam, most likely, you will need to re-address using a more powerful amplifier or change the design of the mount.