| 摘要 |
<p>There is described a propeller (1 ) of the type comprising an external cylindrical casing (2) coupled directly or indirectly to an engine shaft in a manner rotatable about the axis (X) of the propeller, and at least one blade (3) provided with at least one fluid dynamic surface (4) constrained to a related blade shaft (5), which is in turn constrained to said external cylindrical casing (2) to be driven in rotation about the axis of the propeller. The blade shaft (5) has its axis (Y) which extends in a direction incident to the axis (X) of the propeller and the at least one fluid dynamic surface is driven by the related blade shaft in rotation about the axis of the propeller. The propeller is characterized in that the at least one fluid dynamic surface (4) is constrained in roto-translation to the related blade shaft (5), in a manner rotatable about, and translatable along, the axis (Y) of the blade shaft (5), in such a manner that the at least one fluid dynamic surface is translatable along the blade shaft, between an initial position and a final position, and the fluid dynamic surface rotates simultaneously from a first fluid dynamic pitch corresponding to said initial position to a second fluid dynamic pitch corresponding to said final position, and vice versa.</p> |
