Hydraulic hybrid drivetrains, in which energy is stored as hydraulic pressure to propel a vehicle, have been proposed for automobiles that make frequent starts and stops in their duty cycle -- a delivery van, for instance, or a garbage truck. The inventor, Gary Greenwell, has devised a variable-stroke hydraulic pump/motor similar to a World War I era aircraft engine called the Gnome, in which the crankcase and cylinders rotate with the propeller. Greenwell's pump/motor uses the same idea of an offset center of rotation. Greenwell has teamed with Phillip Vera, president of Edge Office Solutions, a business consultant and Xerox reseller in Manassas, VA. Together they have formed a company, RIDE Inc, to market Greenwell's inventions.
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