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 ...

This is a weird engine, with two opposed pistons in one cylinder that come very close to slamming together. It’s a great design for aircraft engines due to it’s lightweight construction.

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 ...