add pvc tubes for buoyancy and stability to aluminum boat

A PVC tube is the cheapest option and can last approximately 10–15 years

This additive vaporizes as the material ages, making the PVC brittle and allowing it to crack. To make it supple, an additive is used with the polymer. PVC (Polyvinyl chloride) - As a material for building tubes, polyvinyl chloride (PVC) has the disadvantage of lacking flexibility. Hypalon is probably the most popular material used for the construction of RIBs manufactured in the UK. Tubes made with Hypalon and Neoprene layers can last at least 5 years. Hypalon is not airtight and so must be combined with Neoprene when used to build tubes. Hypalon - Tubes made of Hypalon are easy to manufacture and can be repaired with simple puncture repair kits. Common materials for the tubes are Hypalon and uPVC (Polyvinyl chloride), though some manufacturers use PU (Polyurethane) This prevents the tubes bursting from overpressure. Dark tubes often have pressure relief valves as the air inside them expands when exposed to sunlight.

This is because if only one chamber is damaged then the impact the damage has on the boat is much less. The more chambers a boat has the more redundancy the boat is considered to have. Larger boats (7m+) have 6 or more chambers with a valve for each chamber. Tubes - The tubes are usually constructed in separate sections to reduce the effect of a puncture, each with a valve to add or remove air. This is a flat area on the rear of the hull designed to allow the boat to have a stable surface to plane on. Modern 'all round' RIB hulls combine a deep v hull at the bow which flattens out to present a broad planing pad.

As with the design of most boat hulls they represent a compromise of different design characteristics. 'Deep-V' hulls cut through waves easily but require greater engine power to start planing than 'shallow-V' hulls, which plane at lower speed but with a more uncomfortable ride. The hull of a RIB is shaped to increase the performance of the boat in the water by optimising its hydroplaning characteristics. Some manufacturers also weave Kevlar into the GRP sheets for extra strength. Hull - The hull is made of steel, wood, aluminium, or more commonly, a combination of wood for the structure and glass-reinforced plastic (GRP) composite for the shaped and smooth surface. High-Performance RIBs may operate with a speed between 40 and 70 knots (74 and 130 km/h), depending on the size and weight. A typical seaborne 6-metre (19 ft 8 in) RIB, with six passengers, 110 horsepower (82 kW) engines, in Beaufort force 2 is very likely to have a top speed of around 30 knots (56 km/h). The maximum speed of the RIB depends on its gross weight, power, length and profile of hull, and sea conditions. RIBs can also generally cope better with rougher seas, although this may be partially due to an increased level of confidence in knowing that a RIB is hard to sink, and better absorption of heavy loads by the flexible tubes, which therefore make heavy seas less unpleasant. Due to their low weight, RIBs often outperform some types of similarly sized and powered boats. RIBs are designed with hydroplaning hulls. RIBs up to about seven metres in length can be towed on trailers on the road this, coupled with their other properties, is making them increasingly attractive as leisure craft. Their shallow draught, high maneuverability, speed and relative immunity to damage in low-speed collisions are advantages in these applications. RIBs are used as rescue craft, safety boats for sailing, dive boats or tenders for larger boats and ships. Generally the power of the motors is in the range of 5 to 300 horsepower (4 to 224 kW). A RIB is often propelled by one or more outboard motors or an inboard motor turning a water jet or stern drive. RIBs are commonly four to nine metres (13 to 28 ft) long, although they can range in length between 2.5 and 18 metres (7.5 and 55 ft). Yachtmaster Sail to Motor Conversion Course.Yachtmaster Offshore Motor Exam Preparation.Yachtmaster Offshore Sail Exam Preparation.Rigid-Hulled Inflatable Boat (RHIB) Deep Blue Sea Training

Add pvc tubes for buoyancy and stability to aluminum boat