Bob Cook has been working on the Cook Inertial Propulsion (CIP) engine engine since February 8, 1968 (34 years ago) after giving up a high paying, 17 year long, career in the printing trade.
He believes the engine could greatly reduce the burning of fossil fuels, make silent running automobiles and aircraft a possibility (anyone who’s been to any international airport would greatly appreciate this), and it could quite possibly be used as a clean energy source due to its theorized efficiency.
Currently, the model has proven itself to be capable of at least being a space maneuvering unit for the space shuttle.
The device utilizes centrifugal force and exchangeable weights timed in such a way that they never go around the back half of the unit.
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http://www.forceborne.com