[Rhodes22-list] Diamond Board Depth

[cowie]

Bob:

Thanks, I was hoping someone would tell me the board is only half way down
and that by lowering it all the way I would improve my ability to point
higher into the wind.  Suppose I just need to learn to adjust my sails
better.  I seem to only be able to come to within about 50-60 degrees of the
apparent wind when beating.  Enclosed is a trip I recorded last year on my
iphone and then imported to cad in order to do a crude set of measurements. 
The average angle off the wind for the trip is about 54 degrees.  According
to Wikipedia, see page two of the enclosed pdf file, that’s about average
for a shallow draft boat.  At least it's better than 90 degrees for a square
rigger; otherwise we would never get anywhere.

http://old.nabble.com/file/p27828783/trip_01.pdf trip_01.pdf 


Bob Keller wrote:
> 
> 
> Looks to me as if it is all the way down.
> 
> BK
>  
>> Date: Mon, 8 Mar 2010 05:30:26 -0800
>> From: ccowie at cowieassociates.com
>> To: rhodes22-list at rhodes22.org
>> Subject: [Rhodes22-list] Diamond Board Depth
>> 
>> 
>> I took advantage of the warm weather this weekend and got my boat ready
>> for
>> the spring launch. With my boat up on jacks I was able to lower the
>> diamond
>> board all the way and took some measurements. I measure 24" from the keel
>> to the bottom of diamond board and also measure 4-3" to 4'-6" from the
>> water
>> line to the bottom of the diamond board. My question is this: is my
>> diamond board all the way down at 24"? I think it is as this seems to
>> match photos on the GB web site but just want to make sure. The older
>> style
>> center board seems to be deeper? Also if the water line to bottom of
>> diamond board is 4'-3" less 24" when the board is up then the draft is
>> about
>> 2'-3" not 20" noted on the GB site? Does the advertised 20" asume a
>> slight
>> heel? Enclosed are some images for reference.
>> 
>> http://old.nabble.com/file/p27819957/illustration_02.jpg
>> illustration_02.jpg 
>> 
>> Cowie 
>> Opus 2009
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