The demonstration units were clearly totally different from the units patented by Dean, and no diagrams had been ever discovered for them. Consequently, it’s not possible to test Dean’s reported designs or units to see in the event that they labored as he claimed. In 1997 physicist John G. Cramer talked about the Dean Drive in Analog in his column “Alternate View”. He mentioned that the demonstration made to Campbell was defective, and the drive had turned out to be bogus, like many different claims of antigravity units. In 2006 a NASA technical memorandum offered the Dean Drive as the
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