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Podkletnov's gravity shielding experimentsAccording to the account Podkletnov gave to reporter Charles Platt in a 1996 phone interview, during a 1992 experiment with a rotating superconducting disk, Someone in the laboratory was smoking a pipe, and the pipe smoke rose in a column above the superconducting disc. So we placed a ball-shaped magnet above the disc, attached to a balance. The balance behaved strangely. We substituted a nonmagnetic material, silicon, and still the balance was very strange. We found that any object above the disc lost some of its weight, and we found that if we rotated the disc, the effect was increased.Podkletnov published a paper in 1992 reporting that the weight of an object directly above the disk was decreased. He concluded that the superconducting disk was shielding the Earth's gravitational force above it. This is sometimes called the Podkletnov effect.
As far as I know he used a 20 pound weight which is not affected by air currents.
You have no argument from me that an object in a liquid will lay less than object and air.
A rotating disc has a minimal fan effect in order to have a fan you need to have blades.
I agree there is some difference caused by the air being at different temperatures.
The experiment claims a 15% drop in the weight of the sample material.