Choosing a swimming vehicle for fishing or relaxing on the water often comes down to finding a compromise between comfort, load capacity and the ability to transport quickly. In this context, hard bottom inflatable boats known as RIB (Rigid Inflatable Boat) occupy a unique niche, combining the best qualities of inflatable PVC boats and classic boats. Particular attention should be paid to models where the role of the hard bottom is played by a molded plasticThis changes the boat’s performance dramatically.
Unlike traditional inflatable floors (NDFs) or plywood floorboards, fiberglass or polyethylene They provide perfect fluid dynamics and durability, which is water-free, rotting, and impact-resistant, but the rigid hull imposes its limitations on weight and size, which is something to consider when choosing. In this article, we'll take a closer look at why plastic bottom RIB boats are becoming more popular with demanding water engines.
Many beginners mistakenly believe that any boat with inflatable sides is the same in operation, but it is not. A hard bottom creates a sliding effect on the water, significantly reducing drag and allowing higher speeds at the same engine power. If you plan to use the vessel not only for quiet fishing, but also for active recreation or even rescue work, then you can use it for a long time. Plastic floor is a critical element of the designProviding security and stability on the wave.
Structural features and materials of the body
The basis of the design of RIB is a rigid housing, which can be made of various materials, but the most common is fiberglass (fiberglass) or high-strength polyethylene. seaworthiness The plastic casings, which are made by rotational molding, are incredibly tough and almost indestructible, although they weigh a little more.
The boards of such boats are traditionally made of multilayer reinforced high-density PVC fabric, usually 1100-1300 g / m2. The connection of soft sides and rigid bottom is carried out by means of a special adhesive seam or mechanical fastening, which ensures tightness and strength of the entire structure. kielson In such models, it is often integrated into the plastic bottom, which increases the rigidity at the kink and allows you to install more powerful motors without the risk of deformation of the transom.
⚠️ Warning: When buying a boat RIB be sure to check the quality of the connection of the side and hard bottom. the presence of glue bloating or uneven fit of fabric may indicate a violation of production technology, which will lead to depressurization on the water.
The design also includes inflatable tubes divided into independent compartments, which ensures buoyancy even if one of the cylinders punctures. The hard bottom in the nose often has a pronounced keeliness, which improves handling. In the aft part, the plastic bottom smoothly transitions into the stern part. graffitiwhich can be reinforced with additional elements for the installation of the motor.
Advantages of a hard plastic bottom over other types
The first and foremost advantage is the stability of the course. Boats with low pressure inflatable bottoms can be slightly flexed when they get on plane, creating additional turbulence. The plastic bottom retains its geometry under all loads, ensuring predictable behavior of the vessel. This is especially important when moving against a wave or when performing maneuvers at high speed, where hydrodynamics It's a key role.
The second important aspect is durability and ease of maintenance: plastic is not corrosive, unlike aluminum, and does not rot like plywood. It is easy to wash, it does not require regular painting or varnishing. It is enough to rinse the case with fresh water after going out on salt water to maintain its pristine appearance. In addition, you can confidently stand on the plastic bottom in shoes with a hard sole without fear of damaging the material, which is impossible in the case of an inflatable floor.
The third advantage is that you can install additional equipment, and it's easy to cut into the plastic bottom. sonarThe hard surface allows you to mount various mounts for spinning or navigation devices without the risk of damaging the structure, making the RIB an ideal platform for professional fishing.
Use special fiberglass polishes once a season to restore the gloss and protect the hull from sunburn, which will extend the life of the boat's appearance for years.
Plastic, especially honeycomb structure or with air chambers inside, heats less in the sun and cools feet less in cold water compared to thin aluminum sheet, which adds comfort to long transitions or fishing in the off-season.
Comparison: fiberglass versus aluminum and plywood
When choosing a hard-bottom boat, water engines often fluctuate between plastic, aluminum and plywood. Each material has its own specifications, but for RIB designs, plastic is often the best choice. Aluminum bottoms are highly rigid, but they are noisy, more susceptible to corrosion in welding sites and more difficult to repair when serious damage is done. Plywood, even aviation, gains moisture over time, which increases weight and reduces buoyancy.
Below is a comparative table of the main specifications of various materials underbody for inflatable boats, which will help you decide on the choice:
| Characterization | Fiberglass | aluminum | Plywood (laminated) |
|---|---|---|---|
| Weight. | Medium. | Low/Mediocre | High (when wet) |
| Impact resistance | High. | Medium (deformed) | Low (laying) |
| Repairability | High (polyester resins) | Complex (argon welding) | Low (sheet replacement) |
| Cost | Medium/High | High. | Low. |
| Noise | Low. | High. | Medium |
And plastic glass benefits from the ability to create complex contours, which is not possible with sheet metal or plywood without a lot of complexity, and it allows you to achieve better speed performance. Aluminum is good for shallow waters, where there is a high risk of hitting rocks, but at high speeds it loses to plastic in comfort due to hardness and noise.
For high-speed planing and comfortable fishing, fiberglass is the “golden mean”, combining strength, maintainability and excellent hydrodynamics.
Impact of bottom design on driving performance
The geometry of the plastic floor directly dictates the behavior of the boat on the water. The deep keel, which is easily formed in the production of fiberglass housings, provides stability; the boat is less blown aside in lateral wind or excitement, and it responds more readily to steering, this is especially true for models longer than 3.5 meters, where the sailing of inflatable tubes is high.
The important parameter is the kilevity angle of the transom, which is 8-10 degrees for calm water and fishing, whereas for sea walks and large waves, it takes 12-15 degrees or more. The plastic bottom allows you to vary this parameter widely. rentan (step on the bottom) contributes to a faster separation from water and exit to planing, saving fuel.
Stiffness also affects load distribution: In soft-bottom boats, the weight of passengers and cargo is distributed unevenly, creating deflections. The hard floor works as a single platform, transferring loads to the sides evenly, allowing heavy equipment such as batteries or anchor winches to be safely placed without fear of disrupting the boat's balance.
⚠️ Warning: When installing heavy equipment in the bow of the RIB boat, strictly control the differentiation. Shifting the center of gravity forward can lead to a buoyancy of the nose in the wave and reduce the safety of the control.
Selection of motor and components for RIB
Choosing an engine for a hard plastic bottom boat requires considering not only power but also the length of the lower unit. Since such boats often have a higher transposition for better hydrodynamics, a standard long lower unit (L) may not be enough and a version with an extended lower unit (XL) version will be required. Inadequate sinking of the propeller will lead to cavitation and loss of traction, especially on the wave.
The recommended engine power is usually indicated by the manufacturer in the product passport. Exceeding this limit is unacceptable, since the plastic transom, although strengthened, has a strength limit. For boats with a length of 3.2-3.6 meters, the optimal choice will be engines with a capacity of 9.9-15 hp, which allow you to bring the vessel to sleeve with two passengers and cargo. Larger models (4.2-4.8 meters) will require engines with a capacity of 30-50 hp.
☑️ Check before buying a motor for RIB
In addition to the motor, you should take care of the quality fuel tank RIBs are characterized by the use of 12-25 litre removable tanks, which are conveniently placed in the bow for balancing, and an important element is the handook seat, which is often mounted on a transom can, blocking access to the interior space of the cylinders.
Care, maintenance and storage of the boat RIB
Operating a plastic bottom boat requires certain rules to maintain its properties for years to come. After each time it is put out on the water, especially at sea, the hull must be thoroughly washed with fresh water. The salt plaque, drying, forms crystals that can act as abrasives when friction or damage the lacquer layer of fiberglass. Regular washing also allows you to notice chips or scratches in time.
When stored assembled (which is possible for some RIB models), it is important to ensure protection against ultraviolet radiation. Although modern materials are resistant to UV radiation, prolonged exposure can lead to color fading and microcracks in the gelcoat. If the boat is stored in disassembled form, the plastic bottom should be protected from impacts and falls of heavy objects, since it is more difficult to repair fiberglass in the field than to seal PVC.
How to remove deep scratches from the plastic bottom?
Small scratches can be polished with car polishing paste. Deep fibreglass chips require a layer of polyester putty, grinding and painting. It is important to degrease the surface before repair and let each layer dry according to the materials manufacturer's instructions.
Winter storage should take place in a dry, ventilated room at a temperature of not lower than -10 ° C (although high-quality plastic can withstand large frosts, PVC tubes can become brittle).
Frequently Asked Questions (FAQ)
Can you repair the plastic bottom of the boat yourself?
Yes, small fissures and chips on fiberglass can be repaired by yourself using polyester resin, fiberglass and gelcoat. However, for deep structural damage or repair of polyethylene housings (which requires special equipment for welding), it is better to contact a specialized workshop.
How much heavier is a plastic bottom RIB boat compared to a conventional inflatable boat?
The weight of a plastic bottom RIB boat is usually 15-25% higher than that of a similar model with NDNDM. For example, a boat 3.6 meters long can weigh 50-60 kg in the basic configuration, while a model with an inflatable floor - about 40 kg.
Is the RIB boat suitable for winter fishing?
You can use a RIB boat in winter, but with caution. PVC materials become tougher in the cold, and plastic becomes more fragile. You need to avoid impacts on the ice and sharp bends of cylinders. It is advisable to maintain the boat at plus temperature before operating.
What is the life of the plastic bottom?
When properly operated and maintained, the life of a fiberglass or polyethylene case is 15-20 years or more. The main wear usually concerns inflatable tubes that require replacement or repair earlier (after 7-10 years of active use).