| 摘要 |
2122477 9309026 PCTABS00022 A propeller for e.g. a ship has a central hub (34) with a plurality of propeller blades (12). Each blade (12) is composed of a flexible elastomer covering (14) of e.g. rubber which is vulcanized firmly on a core (13). The core (13) and the elastomer covering (14) are moulded and vulcanized to an integral unit which, without expensive after-treatment, forms a propeller having a finished smooth surface and a consistency capable of absorbing and damping the impact and shock pulses from the reaction forces of the water. The elastomer covering is not vulcanized firmly on the entire surface of the core, thereby forming on both sides of the core a compartment (16) which can be filled via a filling valve (18) with a fluid under pressure, e.g. air or water. The elastomer covering is adapted such that when deformed it passively adjusts the pitch of the blade optimally to the instantaneous state of operation. When selectively pumped-up, the propeller can moreover actively be given the geometrical shape best suitable for any purpose.
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