inflatable tubes are not just an element of design, but a fundamental basis for the safety of any PVC craft. boat-float They provide buoyancy, stability and splash protection, turning a piece of fabric into a complete transport. Many beginners underestimate the importance of proper care for them, focusing solely on the motor or attachment equipment, which is a gross mistake.
In the modern marine engine industry, the demands on materials are constantly increasing. reinforced PVC It's become a de facto standard that can withstand enormous loads, and understanding the physics of the process and the properties of materials will help you avoid water accidents and extend the life of your boat.
In this article, we will discuss in detail all aspects related to inflatable elements of boats, you will learn about the types of constructions, reinforcement methods and intricacies of operation in different conditions. Seam tightness is a critical parameter that is checked only under pressure for several hours. Without deep immersion in the topic, it is difficult to make the right choice when buying or tuning.
Design features and materials
Modern floats are made of layered materials, where each layer performs its function. polyvinyl chlorideIt's waterproof and ultraviolet. But PVC itself is soft and doesn't hold shape, so you put a grid of polyester strands between the layers of plastic.
The density of the fabric is measured in grams per square meter and can range from 750 to 1100 g/m2. For small rowing boats, 750 grams will do, but for motor versions with an outboard motor, a denser material is needed. reinforcement allows the load to be distributed evenly, preventing the balloon from inflating as a bubble when pressure is increased.
Seams are the most important design element. There are two main technologies for connecting parts: gluing and welding with hot air. Sticked seams made with polyurethane or polychloroprene adhesives are considered more maintainable in the field. Welds, which are characteristic of some imported brands, create a monolithic structure, but their restoration requires special tools.
⚠️ Warning: Never use household superglues (cyanacrylates) to repair PVC floats. They create a hard crust that cracks when the cylinder is deformed and are chemically incompatible with the material, which will lead to the destruction of the fabric around the repair.
When choosing a boat, consider the number of independent compartments, the minimum number is two, but three or four cylinders are considered optimal, which provides a margin of buoyancy even if one sector is seriously damaged. Independent valves They can isolate the damaged area and continue to move.
Types of profiles and geometry of cylinders
The geometry of floats directly affects the rideability and comfort of the crew. The classic round profile provides maximum volume with a minimum circumference, which saves material. However, such cylinders often take up a lot of space inside the cockpit, limiting the usable area.
A more modern solution is flat-shapedThese floats allow you to make the cockpit wider without increasing the overall width of the boat, and this is especially true for fishing, where space is important for placing gear and a comfortable landing. squirter.
There are also inflatable keel boats (BBBs) where the bottom is a separate inflatable element that is an extension of the floats, which makes the boat stiff as a wooden one, and allows for high speeds, but the weight of these boats is much higher, and the preparation for the launch takes longer.
- 🔵 Round profile: Maximum load capacity, classic shape, easier to manufacture.
- 🔵 Oval profile: Improved stability, more space inside, better cuts the wave.
- 🔵 Profile with a timber: protection of the board from impacts on the pier, convenience of mooring.
The choice of geometry depends on the use case. For calm fishing on the lake, stability is important, so wide oval cylinders will be preferable. For a wave or sea walk, speed and ability to hold a course are important, which dictates its requirements for the shape of the nose and keel.
Functional purpose and protection
In addition to the main function of keeping afloat, floats act as a safety buffer: When faced with an obstacle or tipped over, it is the soft board that takes the blow, protecting passengers from injuries and rigid structural elements. Inflatable bules On the perimeter also serve as points of attachment of safety lears.
The important aspect is protection against mechanical damage. The outer side of floats is often equipped with a mechanical damage. flat-fibre This is especially true in the bow, where the likelihood of contact with rocks or snags is greatest when landed.
To protect against UV, manufacturers add special stabilizers to PVC, but prolonged exposure to the scorching sun without a tent can lead to material degradation, loss of elasticity and microcracks. Thermoregulation inside the cylinder is also important: heating the air leads to an increase in pressure, which can cause the seams to rupture.
In hot weather, pour a small amount of air from cylinders before getting on the water or keep the boat in the shade. The pressure inside the closed volume increases proportionally to the temperature, which can lead to overvoltage of the seams.
And the hydrodynamic properties of the floats (limes) shape the nasal ends of the floats (flames) affect the germination of the wave. Pointed lindens allow the boat to overcome the oncoming excitement more easily, while dull ones can cause the nose to bury and splash the cockpit.
Installation and reinforcement of floats
Many owners are looking to improve the performance of their boats by installing additional elements. keel Or replacing it with a higher profile, which allows you to improve your course stability and reduce yaw at high speeds.
The modernization process often involves installation. timber The rubber profile protects the side from abrasion on concrete berths, shells and sharp edges of wooden piers, usually glued to two-component polyurethane adhesive, requiring careful surface preparation (cleaning and degreasing).
For boats with hinged transverses, it is important to properly distribute the load, and the reinforcement of the mounting zone of the transom on the floats is carried out with additional layers of fabric (splash breakers) and rigid inserts, which prevents the cylinder from pressing under the weight of a heavy motor.
☑️ Preparation for the installation of a timber
Any additional elements must be adjusted to the changing centre of gravity and sailing of the boat, too high or too large can degrade wind stability, and all modifications must be done with the gluing technology in place, otherwise you risk damaging the main material.
Maintenance and repair
The durability of floats depends on proper care. After each operation, especially in salt water, the boat must be washed with fresh water. The salt is an aggressive reagent and crystallizes when drying, damaging the microstructure of PVC. The sand and dirt that act as an abrasive should also be removed.
Storage is critical, and you need to fold the boat straightened, avoiding sharp creases on the bends, ideally if you can store the boat half-assembled or inflated in the garage. Rodents They often cause damage to boats during winter storage, so you should use scarepers or hang a boat.
Repairing punctures and cuts is usually easy, using remixes that come with the boat, or special patches made of PVC. The main thing is to ensure clean and dry surfaces, the glue is applied in two stages with intermediate drying to the "straw".
| Type of damage | Patch material | Type of glue | Time to dry |
|---|---|---|---|
| Puncture (up to 3 mm) | Self-adhesive tape | Not required | 10-15 minutes. |
| Tissue cut | PVC patchwork | Polyurethane | 24 hours. |
| Spreading seam | PVC strip | Two-pronged | 48 hours. |
| Etching the valve | Specialist personnel | Hermetic | 12 hours. |
How to check the quality of gluing at home?
Take a blunt object (like a toothbrush handle) and gently, without much pressure, swipe around the edges of the patch, if the material moves away or the characteristic sound of detachment is heard, the gluing failed. A properly glued patch should not depart from the base.
Check the valves regularly, they can clog sand or dry out the sealing gum, lubricating silicone and cleaning threads will help avoid problems with pumping and emulating air. If the valve starts to poison, often just replace the inner spring or sealing ring.
Safety rules for water
Operating a boat with inflatable floats requires strict rules, and overcrowding is one of the main reasons for the loss of stability. Load capacityThe scoring, which is specified in the data sheet, is calculated taking into account the weight of the crew, engine, fuel and equipment, and exceeding the limit by even 10-15% critically reduces the height of the board above the water.
The distribution of weight should be uniform. Shifting passengers or cargo on one side creates a roll, which, combined with the wave, can lead to a rollover.kayuk) this is particularly dangerous because the buoyancy is minimal.
⚠️ Warning: Always carry a scoop or pump. Even the most reliable boat can get puncture from an imperceptible underwater obstacle. Rapidly pumping water will allow you to safely get to shore while the cylinders are still in shape.
When you go out into the open water or when you drive a powerful engine, you should tie yourself or have insurance to prevent falling overboard. Losing a boat because a person was thrown overboard and left is not uncommon on water with wind.
Safety on the water depends not only on the reliability of the boat, but also on the discipline of the crew: sober calculation, the presence of life jackets and knowledge of the rules of behavior on the water are more important than the most expensive equipment.
Frequently Asked Questions (FAQ)
What is the optimal pressure in the floats?
The optimum pressure is usually 0.2 - 0.25 atmosphere (about 200-250 mBar). To the touch the board should be hard, but with a strong press of the finger slightly slacken. Excess pressure in hot weather is dangerous to rupture seams.
Can I seal the boat with the usual glue "Moment"?
Regular adhesives do not provide an elastic seam and have no chemical affinity with PVC. For repair, use only specialized polyurethane adhesives for PVC, designed for boats and awnings.
How often should I lift a boat while fishing?
In cool weather or in the morning, the pressure may drop due to cooling of the air, then pumping is necessary. During the day, in the sun, the pressure increases, control the stiffness of the sides every 1-2 hours and, if necessary, pour excess air through the valve.
What if the boat started poisoning the air, but the hole is not visible?
Soap the surface with soap. Blisters will appear at the leak site. Special attention will be paid to the valves and seams. If the leak is from the seam, you may need professional gluing or the use of a sealant for seams.
How dangerous are punctures for an inflatable boat?
If there are several independent compartments, the puncture of one cylinder is not critical, the boat will remain buoyant, the danger is simultaneous damage to several sectors or a break in the bulkhead inside the cylinder, which is extremely rare with a quality product.