[frers-list]To: Bill Thompson

[Bill Thompson]

4'8" fwd end of keel. 4'9" at aft end (curvature of hull)

7" was the min I could take to get in and out of our harbour. Also because there is a full keel Alberg 37 at our place that draws 5'9", so at low water, I let him plow his way out through the silt, and open the way for me.

Took as little as possible in order to protect performance. However, Mars Keels said that to compensate for the 240 lb we took off, I should have 280 lb to compensate. I asked,for an extra 100 lb down there, feeling I would accept the weight penalty in very light air, as a tradeoff for a little more stiffness. 100 lb 5'9" below the waterline is worth 200 lb on the rail.

Overall increase in wetted surface is about 14 sq in. We can't determine in any scientific way if the shape of the bulb at the end of the keel has any tip vortex attenuation effect, but as I said, I can point with the Etchells, and am as fast or faster on all points of sail except downwind when they hit planing velocity.

Still working on getting our 8-man boat handling as slick as they are in their 3-man boats with smaller, more easily handled sails...

William Thompson
Sent from my iPad

> On Nov 27, 2013, at 1:21 PM, Courtney Thomas <courtneycthomas@bellsouth.net> wrote:
> 
>> On 11/26/2013 2:12 PM, Bill Thompson wrote:
>> Hi Courtney,
>> 
>> I modified the keel. Took off 7", 240 lb. Had Mars Keels do the lead bulb in 2 bolt-through halves with bolt holes pre-drilled. Have pics of the process. So from  standard 6'3" draft, went down to 5'8", but with glass over bulb, drawing 5'81/2". Kept the stub so I can remove bulb and bolt stub back on, up through the bottom if I ever sell it back into the 1 design fleet.
>> 
>> Will send measurement requested later. Need to go to boat and measure.
>> 
>> Best,
>> 
>> Bill
>> 
>> William Thompson
>> Sent from my iPad
>> 
>>> On Nov 26, 2013, at 2:01 PM, Courtney Thomas <courtneycthomas@bellsouth.net> wrote:
>>> 
>>> Bill,
>>> 
>>> Thanks for the sharing your refurbishment experience.
>>> 
>>> My question is:  does your boat have the standard keel or is it the modified shorter one ? In either case,
>>> what is its depth from keel bottom to hull attachment area, please ?
>>> 
>>> I realize "attachment area" is a somewhat vague notion but I refer to.....the vertical distance from an imaginary horizontal plane that would contact the hull's 'bottom most point' and where the keel begins..... to the keel bottom, if that's clearer  :-)
>>> 
>>> When I bought my boat I was told it had the short modified keel but from your pictures, mine "appears" to be like yours.
>>> 
>>> Cordially,
>>> 
>>> Courtney Thomas
>>> ccthomas01@yahoo.com
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> Thank you Bill. I look forward to hearing back regarding your measurements vis-a-vis my own.
> 
> How'd you decide on 7" , etc.....   ?
> 
> Is glassing the bulb related to the 'goback' option, or what ?
> 
> What difference did 7" make ? To my ignorant thoughts, that doesn't intuitively seem like it'd make
> enough difference in anything to be worth the trouble and expense, but admittedly, I know little
> and hope I'm wrong since I was told that someone did something similar to mine but omitted the
> 'goback' step you so wisely included  :-)
> 
> Cordially,
> Courtney
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