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Aviation History
1955
1955 - 1626.PDF
11 November 1955 743 (Above) A Centaurus piston engine is used for the final dynamic balancing check; all vibration signals in the power unit itself are eliminated by an electrical filter, thus enabling a piston engine to be used for the checking of a turbine airscrew. (Right) Centrifugal force on three-bladed airscrews, which are being vibrated in an axial mode, is simulated by applying an internal hydraulic load to the hollowed roots of each blade. Loads on four-bladed airscrews are applied outwardly by steel hawsers. (Below) An early test determines the fatigue resistance of the blade-tip. A hollow-steel specimen is vibrated by a large electro-magnetic vibrator in one of its natural modes, and is subjected to some 100m stress reversals in the course of a three-week test.
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