| 摘要 |
<p>There is described, a variable pitch propeller comprising at least one blade pivoted rotatably to a cylindrical propeller casing (3), a propeller hub (4) coupled to a propulsor and positioned coaxially inside the propeller casing, a kinematic mechanism for adjusting the rotary motion of said at least one blade about its axis of pivoting to the propeller casing as a function of the relative motion of the propeller hub assembly with respect to the cylindrical casing thereof, and elastic means (8) for opposing relative rotation of the hub (4) with respect to the cylindrical propeller casing (3), and vice versa, comprising at least a first(9) and at least a second end(10)for operation thereof. The first end of the elastic means is constrained to the cylindrical propeller casing or to the hub, while the second end of the elastic means is constrained to at least one guide integral with the propeller hub or with the cylindrical casing, and the guide has at least a first and at least a second position for temporary operation of the elastic means which are mutually spaced apart.</p> |
