A wonderfully engineered fully functional single cylinder gas-powered engine.   For more info on: Single Cylinder Gas Powered Engine

A wonderfully engineered fully functional two-cylinder 'V-twin' gas-powered engine.   For more info on: Two-Cylinder V-Twin Gas Powered Engine

A wonderfully engineered fully functional single cylinder 4-stroke gas powered engine.   For more info on: 4 Stroke Single Cylinder Gas Power Engine

This is a 4-cylinder `tumbling spider' gas power engine. This engine is based on aircraft engines tested in the 1930s and 40s. These engines were particularly interesting as replacements for radial engines because their smaller diameter meant that they took up less space.   For more info on: 4 Cylinder Gas Powered Engine