| 摘要 |
A ship's rudder comprises a fixed streamlined support (1) to extend from the sternframe of a ship to about the level of a propeller shaft of the ship and a rudder blade (3) mounted on a rudder stock extending substantially normal to a keel of the ship and cooperating with a submerged bearing at the lower end of the support so as pivotally to mount the rudder blade (3) on the support (2), the rudder blade (3) having a streamlined symmetrical high lift profile, below the level of the support a front streamlined portion with a flank angle of at least 5 DEG and up to about 15 DEG and flanks (3<u>a</u>) forming tangents to the rudder stock, a tail portion in the form of a wedge (4) with a flank angle of at least 3 DEG up to about 10 DEG to act as a race stream deflector and a central streamlined portion fairing the front streamlined portion of the tail portion, the rudder stock and rudder pintle defining the pivot axis of the rudder and lying to the rear of the greatest thickness of the rudder profile.
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