While most engines made in the last 100 years have adhered to the standard single-piston per-cylinder design, the TS3, also known as the "Commer Knocker," is an exception. The opposed-piston ...

Slowly increasing availability of unleaded avgas is among the market developments for piston-engine airplanes.

and Stationair are powered by piston engines. These are 4- to 6-cylinder direct drive horizontally opposed, air-cooled engines. Depending on the aircraft requirements, these engines may be ...