The details might be sketchy, but the basic idea behind the device is fairly simple. It begins with a disc, about six inches in diameter and a quarter of an inch thick, made out of a superconducting material whose recipe Podkletnov has carefully kept secret. The disc is cooled to below -233 degrees centigrade and levitated using a magnetic field. Then an electric field is applied to make the disc spin. So far, all we have is a variation on an electric motor, but Podkletnov claims that when the disc rotates at more than 5,000 revolutions per minute, an object placed above it begins to lose weight. Somehow, he says, the force of gravity is being counteracted--the trick is, you have to get the setup exactly right.
http://www.latimes.com/news/opinion/commentary/la-000021224mar24.story?coll=la-news-comment-opinions
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