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Old 8th January 2009, 05:56 AM   #8
Dan
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Join Date: Aug 2006
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Quote:
Originally Posted by Floyd View Post
Quote from website (Isonic)

"The theory behind the concept: where the water first touches the board, this is where lift is greatest. Where it leaves the board, this is were lift is minimal yet drag is still strong. So effectively, you want more width at the leading edge of the planing surfac and less at the trailing edge of the planing surface. Based on this idea, the concepts of cutaways (Starboard innovation 1999), side cuts (Starboard innovation 2004) and tail wingers (Starboard innovation 2007) were already born. For 2009, Starboard introduces double wingers."

Two points
a) How can edge be less at "trailing edge" than leading .?
Surely any change in width at rear moves trailing edge forward ;ie leading edge at wider point becomes trailing edge ??? (Can you possibly have smaller trailing edge than leading ???)

b) Any cut outs./wingers increase length of trailing edge not reduce it ??? (ie shortest trailing edge would be straight line ???)

Thought idea behind cutouts was to reduce lift but at cost of extra drag ? (ie longer trailing edge but reduced lift to help control at top speeds ??)

Confusing ???
My suggested answers to your two questions, Floyd.

a) Think of a fin that is more or less straight on its trailing edge but curved on its trailing edge. Lay it flat on a table. This is an example of when you will see more width (span of the fin) on the leading edge while observing a more narrow trailing edge. The planing surface of a board works very similarly. By changing the curve and location of maximum depth of a fin, you can move the trailing edge forward (shortening the chord length of the fin) without dramatically altering its performance. Likewise you can change its performance.

b) Wingers, generally, create more a more parallel outline in the middle of the board that may offer more power and/or speed at certain angles but keep a more narrow tail that may add control or raise the nose of the board. It's very unlikely that Star-board made no other changes to these boards besides the wingers. Subtle tweaks to many deign parameters are likely involved to offer improved performance. One of those changes appears to be the use of wingers.

-Dan
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