Sell Hobby Engines - Hot Coffee Stirling Engines

A Stirling  Engine, often called a "Hot Air Engine", uses an external heat source to repeatedly heat and cool a volume of gas. This engine can operate well by just placed it on the top of a cup of hot coffee , or just put on some ais .The pressure fluctuations caused by the expansion and contraction of the gas, acting on a piston , provide the force necessary to make the engine run.