Rudder device for high-speed boats, with a cavitation reducing rudder, twisted, especially completely suspended

摘要

Rudder device for high-speed vessels with a twisted rudder, with cavitation reducer, comprising a rudder blade with a propeller (115) associated with the rudder blade and arranged on a driving axle (PA), as well as an axle of rudder (140) attached to the rudder blade (100), in which the rudder device (200) a) is formed by a rudder blade (100) that has a thin profile with a reduced thickness composed of two segments of shovel (10, 20) with the same height or with different heights, arranged one above another, with a lower blade segment (20) having a reduced height with respect to the height of the upper blade segment (10) and with edges of attack (11, 21) directed towards the propeller (115) that present a profile approximately semicircularly and that are positioned such that an attack flange (11) is laterally shifted to port (BB) or starboard (SB) and the other edge of attack (21) is offset laterally te starboard (SB) or port (BB) with respect to the medialongitudinal line (LML) of the rudder blade (100), and in which the surfaces of the side walls (12, 13; 22,23) of both rudder blade segments (10, 20) converge on a final edge (15) directed away from the propeller (115), a1) in which both leading edges (11, 21) and the edge end (15) extend downwards narrowing conically and reducing cross-sectional surfaces (30) from the upper zone (OB) to the lower zone (UB) of the rudder blade (100), a2) or where the final edge (15) extends rectilinearly and parallel to the axis (140) of the rudder and the two leading edges (11, 21) extend downwards narrowing conically and reducing the size of cross-sectional surfaces (30) from the upper zone (OB) to the lower zone (UB), a3) in which two rectilinear side wall segments (16; 17; 26, 27) have the same length in pairs and the cross sections between both segments of side wall (16, 17; 26, 27) have the same size and are symmetrically shaped, a4) in the that the distance between a side wall segment (18; 28) that extends in an arc-shaped way with respect to the longitudinal midline (LML) is greater than the distance between a lateral wall segment (19; 29) that extends very arched with respect to the longitudinal midline (LML) ), and the cross sections located on both sides of the longitudinal midline (LML) between the two lateral wall segments (18; 28) that extend in the form of a flat arc are formed asymmetrically deformed, and b) is formed by an axis of rudder (140) with at least one bearing which acts in functional synergy with the rudder blade (100), and b1) in which the shaft (140) of the rudder is arranged together with the limera tube (120), in the one that is removed, in the area of the greatest profile thickness (PD) or between it and the leading edges of the upper blade segment (10) and extends with its fixing device (145) at the end through the entire height of the upper shovel segment (10), b2) in which the limera tube ( 120), deeply sunk in the upper shovel segment (10), to choose (140) the rudder is equipped, as a cantilever arm, with a longitudinal internal hole (125) in the center to receive the rudder shaft (140) , b3) in which the cross section of the limera tube is made with thin walls and the delimiting tube (120) has a neck bearing (130) on the side of the inner wall to receive the axis (140) of the mirror, and b4 ) in which the shaft (140) of the rudder protrudes in its final zone (140b) with a section (140a) of the tube (120) and is connected at the end of this section (140a) with the upper blade segment ( 10), characterized in that c) the cross sections (31) of the upper (10) and lower (20) blade segments have in the area between the final edge (15) and the greater profile thickness (PD) of the blade of the rudder (100) a length (L) corresponding at least 1½ times the length (L1) of the cross sections (32) of l Upper (10) and lower (20) blade segments between the thickest area of the profile (PD) of the blade (100) and the leading edges (11, 21), c1) the upper blade segment (10 ) has a port side (BB) and the lower blade segment (20) has a starboard (SB) two side wall segments (18, 28) that extend in a flat arc from the leading edges (11, 21) in the direction at the end edge (15) with a length (L2) corresponding to the length (L'2) of the side wall segment (18) from the leading edges (11, 21) to the area of greater profile thickness (PD) more a length (L''2) corresponding at least 1/3 of the length (L'2), being arranged next to the side wall segment (18, 28) in the form of a flat arc or side wall segment (16, 26) rectilinear ending at the end edge, and c2) the upper blade segment (10) has starboard (SB) and the lower blade segment (20) port (BB) both segments of lateral wall (19, 29) strongly arched extending from the leading edges (11, 21) in the direction of the final edge (15) with a length (L3) that extends along a length (L'3) of the segment side wall (19) from the leading edges (11, 21) to the area of greater profile thickness (PD) plus a length (L''3) corresponding at least 1/3 of the length (L ' 3), the rectilinear side wall segment (17, 27) ending at the end edge (15) being disposed next to the side wall segment (19, 29).