A pneumatic motor (air motor), or compressed-air engine, is a type of motor which does mechanical work by expanding compressed air. Pneumatic moto generally convert the compressed-air energy to mechanical work through either linear or rotary motion. Linear motion can come from either a diaphragm or piston actuator, while rotary motion is supplied by either a vane type air motor, piston air motor, air turbine or gear type tic moto have existed in many forms over the past two centuries, ranging in size from hand-held moto to engines of up to several hundred hoepower. Some types rely on pisto and cylinde; othe on slotted roto with vanes (vane moto) and othe use turbines. Many compressed-air engines improve their performance by heating the incoming air or the engine itself. Pneumatic moto have found widespread success in the hand-held tool industry,[1] but are also used stationary in a wide range of industrial applicatio. Continual attempts are being made to expand their use to the traportation industry. However, pneumatic moto must overcome inefficiencies before being seen as a viable option in the traportation industry.