There's the remains of a stationary engine that used to run a cotton gin down at the Alabama state line near me. Single cylinder Diesel, with a 24" bore and approximately a 4 foot stroke. The flywheels (two of them) are cast in several pie wedge shapes and bolted together. They're close to 8 feet in diameter. I believe top speed on that one was around 60 RPM, but the torque was incredible. It was started by locking the flywheel, filling the combustion chamber with compressed air, and release the flywheel brake. Once the engine was spinning with the compression relieved, then the compression release was closed off. It shook the ground, too!

Sort of like this one- - - - -only bigger! Go to about the 3 minute part of the video:

www.youtube.com/watch?v=MiMPTCVz4mQ

Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!