A rotary engineâs housing is a simple epitrochiod of two circles. The rotor spins eccentrically inside the housing, thus changing the volume of three spaces (chambers) formed between the two. Rotary engines share the same four-stroke sequence of piston engines: intake, compression, power, and exhaust.
Fibre-reinforced plastic. Fibre-reinforced plastic (FRP) (also called fibre-reinforced polymer, or fiber-reinforced plastic) is a composite material made of a polymer matrix reinforced with fibres. The fibres are usually glass, carbon, aramid, or basalt. Rarely, other fibres such as paper, wood, or asbestos have been used.
Those materials include glass-fiber (of course), cloth (cotton or man-made), carbon-fiber, non-woven glass or carbon mat, coir (a coconut fiber), modal (beech tree fiber), bamboo, and even hemp fiber. In truth what most people call fiberglass is properly referred to as Fiber Reinforced Plastic (FRP). It is a composite material, much like Carbon Fiber Reinforced Plastic (CFRP) so popular today, but FRP predates carbon fiber by at least seventy years.