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The rounded design is older.. Rawson's changed around 1977 from rounded to squared off. The newer rudder enables better sailing at slow speed. Hal Roth also upgraded his first "Whisper" with "a more modern shape" recomended by the designer.
Don't know the particulars, but if designers changed from round to square there must be a reason. My guess is a rounded design has more drag, and is less efficient. Its trailing edge is much longer than a square rudder, with less surface area.
Last edited by sailboy21 : 01-23-2008 at 12:32 PM.
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