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bottom of centerboard profile


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  #1 Randy Jones

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Posted 15 February 2012 - 06:38 PM

I've got the centerboard of my CS17 out for repairs. The bottom edge is shaped in profile much like the leading edge of an airfoil. Is this the usual shape, or should the bottom have a profile similar to the trailing edge? My thought is that when the board is partially up, the bottom becomes the new trailing edge and should be shaped like a trailing edge.
I won't pretend that the extra 1/8th knot of boat speed is important, but I might as well do it correctly.
thanks.
Randy

  #2 Tom Lathrop

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Posted 15 February 2012 - 07:22 PM

I've got the centerboard of my CS17 out for repairs. The bottom edge is shaped in profile much like the leading edge of an airfoil. Is this the usual shape, or should the bottom have a profile similar to the trailing edge? My thought is that when the board is partially up, the bottom becomes the new trailing edge and should be shaped like a trailing edge.
I won't pretend that the extra 1/8th knot of boat speed is important, but I might as well do it correctly.
thanks.


Randy, 1/8 knot is way more than you will ever see from such a shape variation on the bottom of your CB. Just carrying the shape of the nose around the bottom is as good as you could ever measure a speed difference from.

  #3 Hirilonde

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Posted 16 February 2012 - 05:45 AM

On top of what Tom said also consider that the bottom edge is what drags when you run aground. The more blunt it is the stronger and less effected by wear it is.

Dave Finnegan

1967 Pearson Renegade  "Hirilondë"

Spindrift 9N #521 -  many KudzuCraft SoF kayaks


  #4 Scott Dunsworth

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Posted 16 February 2012 - 07:55 PM

I agree totally with Tom and Dave. My Belhaven board was banged around on the bottom to many times but was still in reasonable shape because it was rope edged and pretty blunt.

Scott

ROMANS 8:1, BELHAVEN 19, SPINDRIFT 12S, 10N, PENOBSCOT 14,
IN OVER MY HEAD CANDICE 28





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