| 摘要 |
A static force balancing system attached to a lifting body flying on a free-flight suspension system in a wind tunnel which balances the static lift forces generated in excess of lifting body weight while permitting freedom of movement of the lifting body in response to dynamic forces. The static lift forces are balanced by the flow of pressurized air against a piston sliding loosely in a casing. Friction between piston and casing is essentially eliminated by a portion of the pressurized air leaking past the piston. Force variation with piston position is essentially eliminated by providing a pressure reservoir connected to the casing which acts as an accumulator.
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