A propeller device for aircraft, spacecraft or watercraft comprising two or more blades and a spinner. The blades are arranged on a hub so that they can be in a deployed or a retracted position. The spinner comprises first, second and third movable portions configured for allowing deploying or retracting the blades and for keeping the blades deployed or retracted.
PROPELLER DEVICE FOR AIRCRAFT, SPACECRAFT OR WATERCRAFT
2017-07-20
Patent
Electronic Resource
English
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