The primary objective and also utility of an aircraft engine is to provide thrust to push an airplane with the air as well as wind and suppress the force of drag and returning. There is a substantial series of piston airplane engines as well as all of them have various maintenance as well as fixture need. Rotary Piston EnginesThese engines were established for military airplanes. These rotary engines entered play when individuals began recognizing that the in- line aircraft engines were really heavy, specially for army operations. In rotary piston engine the entire engine is revolved with a support, which develops additional air movement, which further cools off the engine.