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SloopJonB 03-23-2013 04:17 PM

Waterline Length
Does anyone know if, when a rudder blade comes above the W/L of a boat, the width of the rudder or a portion of it is included in the normally accepted W/L length measurement?

Or, in a case like that, does the W/L measurement end at the rudder post?

Faster 03-23-2013 04:26 PM

Re: Waterline Length
Uhhh.... Bob? you there??? ;)

I'm going with rudder post.....

bobperry 03-23-2013 04:42 PM

Re: Waterline Length
I have that feature on a lot of my designs. I would never include the chord of the rudder in the DWL measurement. There is just not enough volume involved, wit a normal rudder, for it to help extend the sailing length of the boat. Of course you could fudge it and include the chord of the rudder but I think you'd be fooling yourself. So I agree with Faster on this one.

I could be wrong but I know the way I have treated rudders.

Now there were some rudders back in the very early IOR days, we called them "golf tee rudders, that had a very thick upper end that faired right into the bustle. A section thru the rudder stock would look almost exactly like a golf tee. In that case I would include the rudder chord. But these rudders were devilishly difficult to build and dissapeared quickly. Britt Chance used them on a few of his designs.

SloopJonB 03-23-2013 05:23 PM

Re: Waterline Length
Thanks Bob.

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