Nautical propeller

Propeller according to any one of the preceding claims wherein, when the resistant torque opposing the propeller rotation is higher than the torque generated by the preload of said at least one elastic element (8), said at least one elastic element is deformed and adjusts the modification of the fluid dynamic pitch of said at least one blade.

Propeller according to any one of the preceding claims, characterized by comprising means (30) for modifying the preload of said at least one elastic element (8).

Propeller according to any one of the preceding claims, characterized by comprising at least one intermediate element (11) interposed between said hub (2) and said cylindrical casing (3) of the propeller.

Propeller according to any one of the preceding claims wherein, following the rotation according to a second rotation way (R2) of said hub with respect to said cylindrical casing (3) of the propeller in an angular range (a) of free rotation of said hub (2) with respect to said cylindrical casing (3) of the propeller, said at least one blade is arranged on at least one fixed fluid dynamic pitch for the reverse motion.

Propeller according to any one of the preceding claims, characterized by comprising at least one limit stop (41) of the rotation of said hub (2) with respect to said cylindrical casing (3) of the propeller in order to set said fixed fluid dynamic pitch for the reverse motion of said at least one blade (4) following the rotation according to a second rotation way (R2) of said hub (2) with respect to said cylindrical casing (3) of the propeller.

Propeller according to any one of the preceding claims, characterized by comprising at least one limit stop (40) of the rotation of said hub (2) with respect to said cylindrical casing (3) of the propeller in order to set at least one final fluid dynamic pitch of said at least one blade (4) following the rotation according to a first rotation way (R1) of said hub (2) with respect to said cylindrical casing (3) of the propeller.

Propeller according to any one of the preceding claims, wherein said at least one elastic element (8) is a flat spring (100) according to any one of claims 37 to 45.

Propeller according to any one of the preceding claims, further comprising at least one elastic element (8′) interposed between said cylindrical casing (3) and said hub (2) and designed to generate a torque for the rotation of said hub (2) with respect to said cylindrical casing (3) of the propeller, or vice versa, in at least one predetermined relative position, when said engine imposes a null engine torque to said hub (2) according to any one of claims 46 to 58.

Propeller according to any one of the preceding claims, characterized by comprising reversible-locking means (405, 406, 406a, 406b) to lock the relative rotation between said hub (2) and said cylindrical casing (3) in at least one rotation way (R1, R2), in correspondence of at least one predetermined relative position, preferably in at least one predetermined relative position in which said at least one blade (4) is arranged in feathered position according to any one of claims 59 to 77.

Propeller according to any one of the preceding claims, characterized by comprising at least one elastic element (8″) directly or indirectly interposed between cylindrical casing (3) and hub (2) and sized to eliminate shocks and dynamic stresses between cylindrical casing (3) and hub (2) according to claims 78-87.

Method of using a propeller (1) according to any one of the preceding claims that is rotationally coupled with an engine, characterized by arranging said at least one blade (4) on at least one first fluid dynamic pitch, following the rotation according to a first rotation way (R1) of said hub (2) with respect to said cylindrical casing (3) of the propeller in an angular range (a) of free rotation of said hub (2) with respect to said cylindrical casing (3) of the propeller until the resistant torque opposing the propeller rotation is lower than, or equal to, the torque generated by the preload of said at least one elastic element (8).

Flat spring (100) for propeller, said spring having a longitudinal development line (MS) and comprising a plurality of notches (103) transversally arranged with respect to said longitudinal development line, characterized in that at least two distances (MD) between successive notches (103) are different from one another and/or at least two notches (103) are different from one another.

Propeller (1) comprising a cylindrical casing (3), a hub (2) couplable to an engine and rotatably mounted at least partially in said cylindrical casing of the propeller, and at least one blade (4) rotatably pivoted to said cylindrical casing of the propeller, said hub (2) being rotatable with respect to said cylindrical casing of the propeller, or vice versa, to adjust the fluid dynamic pitch of said at least one blade (4), characterized by comprising at least one elastic element (8′) interposed between said cylindrical casing (3) and said hub (2) and designed to generate a torque for the rotation of said hub (2) with respect to said cylindrical casing (3) of the propeller, or vice versa, in at least one predetermined relative position, when said engine imposes a null engine torque to said hub (2).

Propeller according to any one of claims 46 to 54, characterized by comprising reversible-locking means (405, 406, 406a, 406b) to lock the relative rotation between said hub (2) and said cylindrical casing (3) in at least one rotation way (R1, R2), in correspondence of at least one predetermined relative position, preferably in at least one predetermined relative position in which said at least one blade (4) is arranged in feathered position according to any one of claims 59 to 77.

Propeller according to any one of claims 46 to 57, characterized by comprising at least one elastic element (8″) directly or indirectly interposed between cylindrical casing (3) and hub (2) and sized to eliminate shocks and dynamic stresses between cylindrical casing (3) and hub (2) according to claims 78-87.

Propeller (1) comprising a cylindrical casing (3), a hub (2) couplable to an engine and rotatably mounted at least partially in said cylindrical casing of the propeller, and at least one blade (4) rotatably pivoted to said cylindrical casing of the propeller, said hub (2) being rotatable with respect to said cylindrical casing of the propeller, or vice versa, to adjust the fluid dynamic pitch of said at least one blade (4), characterized by comprising reversible-locking means (405, 406, 406a, 406b) to lock the relative rotation between said hub (2) and said cylindrical casing (3) in at least one rotation way (R1, R2), in correspondence of at least one predetermined relative position, preferably in at least one predetermined relative position in which said at least one blade (4) is arranged in feathered position.

Propeller according to any one of claims 59 to 76, characterized by comprising at least one elastic element (8″) directly or indirectly interposed between cylindrical casing (3) and hub (2) and sized to eliminate shocks and dynamic stresses between cylindrical casing (3) and hub (2) according to claims 78-87.

Propeller (1) comprising a cylindrical casing (3), a hub (2) couplable to an engine and rotatably mounted at least partially in said cylindrical casing of the propeller, and at least one blade (4) rotatably pivoted to said cylindrical casing of the propeller, said hub (2) being rotatable with respect to said cylindrical casing of the propeller, or vice versa, to adjust the fluid dynamic pitch of said at least one blade (4), characterized by comprising at least one elastic element (8″) directly or indirectly interposed between cylindrical casing (3) and hub (2) and sized to eliminate shocks and dynamic stresses between cylindrical casing (3) and hub (2).