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Go Back   SailNet Community > On Board > Gear & Maintenance > Advice on glassing in wood keel spacer block
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Thread: Advice on glassing in wood keel spacer block Reply to Thread
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Topic Review (Newest First)
04-10-2011 08:21 PM
fallard Halsey Herreshoff is at the Herreshoff Museum in Bristol, RI. (Herreshoff Marine Museum & America's Cup Hall of Fame) and ought to have an opinion on your project.
04-10-2011 08:10 PM
Deric
Any updates on your boat?

Hey Walt,

How far along are you with your boat? You mentioned you own 1 of 2 made and was wondering if you were able to learn anything more about your boat.

I have a Herreshoff Cat Ketch 33 by CKY and there is no design such as yours. Perhaps the larger cat ketches had such changes. There were many 31 footers, but the larger boats were rare, most likely the cost made it so.
08-11-2010 10:27 AM
Gene T Thanks for the update, nice to know.

Gene
08-11-2010 10:23 AM
Stillraining interesting....glad I didn't vote...I would have been wrong as well...
08-10-2010 11:17 PM
bigwalt I contacted the builder and also the mast designer about this construction - and here's the real scoop on it

From the mast designer:
The keel was likely designed that way because these boats were built over male forms. The keel stub--the wood part--was likely NOT part of those forms. Yet, the keel serves two functions--it has to hold the ballast down low for appropriate stability, and it has to have enough area to balance the loads from the rig. If you had a keel that was just the lower ballast part without the wood spacer, it would not have enough profile area, and the ballast would be too high up--center of gravity too high. Or, if you made the wood part also out of lead, there would be too much ballast. Or, if you reduced the thickness of the solid lead keel blade, it may be too thin, and the ballast weight would not be low enough. In a normal female molding process, that wood stub would be made out of fiberglass and the inside would be hollow and a deep sump. In this case, because there was no female mold and the stub was not included in the fiberglass hull molding, the next logical form of construction is a wood spacer with the ballast part attached below that.

From the builder:
Yes the wood spacer is to lower the CG of the keel. The structural integrity of the hull is simpler and better without a sump or the lead being poured down into a glass shaped keel. You can hit something down low in the lead or up high in the wood and your will have an easily repairable ding.
08-03-2010 10:24 AM
merc2dogs Almost looks as though someone switched the keel out and used the wood to match up the different profiles of the stub and keel. (as you'd do with wood to mount a winch on a mast)

Would like to see a lines drawing of the boat as designed to compare.

Take it that dropping the keel and completely encapsulating the wood is not a viable option?
08-03-2010 09:22 AM
deniseO30 The write up mentions shoal draft... someone added the spacer tis my bet
08-03-2010 01:59 AM
mitiempo I've never seen anything like it either. But it does look solid and it has been there a while...Maybe they either thought that was easier than building a stub into the mold or they screwed up and forgot to.

I think your plans make sense. Epoxy and a double layer of biax will work well.
08-02-2010 11:48 PM
bigwalt Here's a link to a writeup about these Cat Ketches - there were several sizes made - 27' 31' 38' 45' . Only two of the 45' were made before Cat Ketch Corp closed shop.

http://i935.photobucket.com/albums/a...g?t=1280806916
08-02-2010 11:22 PM
Gene T I don't see that design listed in the Halsey Herreshoff designs. There is a 44 Freedom listed but it has a fin keel. I wonder if it is a modified design, in which case the wood is not necessarily part of his design.
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