Their focus is on free piston engines as power sources for hybrid electric vehicles, something which due to their small size they seem ideally suited for. Perhaps the free piston engine has faced ...

However, [Attila Blade]’s version of a free-piston type Stirling engine is simple enough to be built in a matter of minutes. To build the engine you only need a test tube, steel wool ...

Cessna, a Textron Aviation brand, currently offers several types of single-engine aircraft that fulfill a wide variety of ...

Also for $29.99 is the Exploring Kid Steam Engine Kit. This mostly plastic kit, when assembled, includes a boiler and tube leading to a piston. Due to the open flame and numerous small parts ...