The process of preparing the boat for the launch often raises questions among beginners, especially when it comes to designs with a water supply. hard-bottomedMany owners have difficulty in trying to stack sleighs and pump the keel-ballon smoothly, resulting in uneven body geometry. The right sequence of actions is not just a recommendation, but a necessity for ensuring the safety and durability of the product.
In this article, we will discuss how to build a PVC boat with a hard bottom and inflatable keel to avoid common mistakes, why it is important to keep a certain order of pumping cylinders and how to properly straighten the folds of fabric before installing the floor. Video instructionsThe graphs that users often search for usually show the process itself, but rarely explain the physical logic of actions, which we will now discuss in detail.
Quality assembly affects the hydrodynamics If you ignore the rules of the floorboard installation, you can damage the seams or get a hump in the middle of the cockpit, which will interfere with fishing, let's look at each stage of preparation for the season or going to the pond.
Preparation of the site and initial inspection
Before you start pumping, you need to choose the right site. clean and smoothIt's perfect for a lawn, a wooden flooring or a clean concrete floor in a garage, sand is also acceptable, but small particles of it can get into the valves, so be careful.
Decompose the boat in its unfolded form and let it "lie down", especially if it was stored in a folded state at low temperatures. PVC It has to spread the folds and heat up to ambient temperature in the environment, and the cold material becomes stiff and less elastic, making it difficult to assemble.
- 🔍 Visually inspect the cylinders for obvious punctures or damage.
- 🧹 Remove from the assembly site piercing objects and debris.
- 🌡️ Allow the boat to warm up in the sun for 10-15 minutes before the start of the work.
⚠️ Warning: Never attempt to assemble a boat in the cold without first warming up in a warm room. Cold PVC becomes brittle and risk damaging material or weld It increases dramatically when it is stretched.
Inflatable keel and side cylinders
One of the most critical things is to determine the order of pumping. keel (NDD) or even hard bottoms, where the keel is part of the structure, it is important to create the right internal pressure, always starting with the keel if it is structurally separated, or with on-board cylinders, leaving the keel under-pumped until the final.
Use a pressure gauge pump to control the pressure. The optimal values are usually 0.2 atmospheres for primary pumping. Do not immediately pump to the working pressure (0.25-0.3 atm), as you will need space to maneuver when installing rigid floorboards. Inflatable keel It only needs to be slightly straightened to keep in shape, but remain soft enough.
If you pump the keel to the floor, it can get stuck in the slabs or sides, creating excessive tension, which will cause the hard elements of the bottom simply do not fall into place. Air pressure. It should grow gradually, in sync with the installation of elements of the hard floor.
Technology of laying rigid floorboards
Installation aluminum or plywood The floor is made up of several sections connected by profile tapes, and first, put the sections on the ground in a single plane, connecting them with locks or profile joints.
Place the assembled floor inside the boat, spreading the bottom fabric. It is important that longitudinal stringers (if any are in the design) or reinforced strips of fabric go exactly along the keel. Carefully straighten the folds under the floorboards to prevent the formation of stress points.
☑️ Checklist for flooring
Move from transom to nose, pressing each section tightly, make sure the locks between the sections are snapped or tightly connected, and if the floor is made up of separate sheets without profiles, they should lie tightly together, forming a monolithic surface.
Floor fixation and structural tension
After all the sections have been laid, the nose of the floor must be fixed. stretch-beltIt's a snag that clings to a nose jar or a special profile, and it's a key to creating rupture rigidity.
Floor tension removes the longitudinal folds on the bottom and prevents sections from moving during movement. If the floor is laid correctly, the boat should resemble a rigid hull, not a soft sack. Check if there are any waves of tissue under the feet.
| Element | Function | Feature of installation |
|---|---|---|
| Paiola | Creating a hard bottom | They require a smooth stacking without distortions |
| Stringers | Connection of floor sections | They must enter the grooves tightly, without gaps. |
| Tension belt | Geometry fixation | Last-rate stretch. |
| transom plate | Foot and motor stress | Must stand vertically. |
If you feel the floor is cruising or the sections are diverged, then the tension is insufficient or the assembly order is broken, in which case you may need to partially flush air from the sides for relaying.
Final pumping and geometry testing
Once the floor is fixed and fixed, you can start to finish the pressure work. keel It's up to the working value (usually 0.25-0.3 atm, see the instructions for the particular model) Right now the keel will straighten completely and arch the bottom into the correct keeled shape.
After the keel, bring the pressure in the onboard cylinders to normal. Note that in the sun the pressure will increase, so in hot weather do not pump the boat over the limit on the shore. Working pressure Check only on a cold or slightly warmed balloon.
Why does the boat "bend" after pumping?
It's a normal physical process. When you increase the pressure inside the closed volume, the soft walls tend to take a spherical shape. The hard floor (floorboards) prevents this by creating stress. The keel, as it swells, pushes the center of the bottom upwards, forming the keeliness necessary for glides.
Check the symmetry of the sides. They should be the same height and elasticity. If one side seems softer, check the valve for etching air. Equal pressure distribution is the key to the stability of the boat.
Common errors in assembly
Even experienced water-engineers sometimes make mistakes that can shorten the life of the boat, the most common being trying to shove a hard floor into an already fully inflated boat, which leads to cloth damage and deformation of the seams.
They often forget to check. cross-plate If the keel is inflated unevenly or skewed, the transom can stand at an angle, which will cause the boat to yaw on the move. Visual control of geometry is mandatory.
- ❌ Injection of the keel to working pressure before laying the floor.
- ❌ Ignoring the tension belt, which leads to a “cruising” of the floor.
- ❌ Assembly on a dirty surface without litter.
Use talc or a special powder to treat the floorboard locks and the inside of the case. This will prevent the rubber layers from sticking together and make it easier to disassemble the boat at the end of the season.
⚠️ Warning: If you hear a characteristic crackling or see that the fabric between the floor sections has become very tight and white (stress whitening effect), stop pumping immediately. This is a sign of critical tension of the material that can lead to rupture.
Seasonal storage and conservation
Proper assembly is only half the battle. To make the boat last, you need to be able to properly disassemble and canned. After the season, be sure to wash the boat with fresh water, especially if you have been swimming on salty seas or stagnant seaweed.
Dry the product completely before packaging, and the moisture left over inside the folds will cause mold and a bad smell that is almost impossible to remove. Plywood elements The floors should also be dry so as not to be stratified.
Stack the boat carefully, avoiding crumpling the same cloth in the same places every time, changing the fold lines with each package, which will help avoid cracking the folds in the future.
Compliance with the pumping order (first the side / keel partially, then the floor, then the final pumping) is the main secret of fast and safe assembly of a hard bottom PVC boat.
Can I build a boat with a hard bottom alone?
Yes, it is possible, but it requires some skill. For models up to 3.2-3.4 meters long, one person can do well. For larger boats (3.6 m and above), the help of a second person is recommended, especially when installing the bow of the floor and stretching the belts, as it requires considerable physical effort.
What pressure should be in the inflatable keel?
The optimum pressure in the keel is usually 0.25-0.3 atmosphere (or 3.5-4.5 PSI). The exact values are always indicated in the product passport. The pumped keel can deform floorboards, and the under-pumped one will not provide the necessary rigidity and driving qualities.
What to do if the floor sections do not stand in place?
Most likely, the sides or the keel are pumped. Lower the air from the cylinders (up to 0.15-0.2 atm), spread the floor, remove the folds of tissue under it, and only then start the final pumping. Do not use excessive force.
Do I need to lubricate the paiole locks?
No special lubrication is required, but the cleanliness of the locks is mandatory. Sand and dirt act as abrasive, destroying the profile, it is recommended to periodically wipe the profiles with a wet cloth and powder with talc for better slip when Assembly.