On Apr 8, 2007, at 3:06 AM, Listerdiesel wrote: > companies such as Ruston > & Hornsby made engines with what were called 'Electric Flywheels" for > electricity generation sets. As did Fairbanks-Morse. My little oilfield ZC52 has the heavy flywheels they used on the electric generating version. John Culp Bristol, Tennessee, USA