C&C 27 and 30 rudders

Could they be related?

The 'scimitar' rudder used on the C&C 27 Marks I and II (buff hull) and on the 30 Mk I (grey hull), as well as other C&C boats of the period, was based on tank-test data that was misinterpreted by the yacht design community at large. The scimitar rudder has a large area aft of the rudder post and little area in front so steering loads build up quickly. Some argue that the rake of the post tends to lift the stern from the water at high angles of heel, exactly the opposite of what is desired. Inarguably, by extending it aft of the transom, C&C designers made it vulnerable to damage.

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