Stirling Engine

Stirling engines are a type of reciprocating external heat engine that uses one or more pistons to achieve useful work through some input of heat from an external source. They differ vastly from internal combustion engines that are seen in most vehicles. Stirling engines use the same gas over and over, unlike internal combustion engines which constantly intake and exhaust the gas. Also, Stirling engines do not use explosions like normal gasoline engines, therefore they are very quiet.