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3 Posts
Initially Posted - 11/02/2002 :  08:06:21  Show Profile
Its that time of year and I need to build a wood cradle for my C25 wing keel. Will 4"x4" treated wood timber be strong enough for the frame? They will work for the stringers (transverse pieces), but what about the fore and aft pieces. These will carry the weight when the hudraulic trailer moves the cradle and boat.

Any other suggestions?

Bob P C25 WK/TR Second Wind
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osmepneo
Past Commodore

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USA
1420 Posts
Response Posted - 11/02/2002 :  10:29:35  Show Profile
Bob,

That's a good question <img src=icon_smile_big.gif border=0 align=middle>!

My knee jerk reaction is "Yes," but I don't know the strength characteristics of 4*4 treated wood.

My Dad had a Dragon and I believe the support pieces for his boat cradle were 4*4's. Dragon weighs a bit less than a C25.

But unless someone on this forum knows I'd ask the lumber yard people about the strength characteristics. Let us know what happens.



Don Peet
c25, 1665, osmepneo, sr/wk
The Great Sacandaga Lake, NY


Edited by - osmepneo on 11/02/2002 10:30:32
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Douglas
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1595 Posts
Response Posted - 11/02/2002 :  11:17:15  Show Profile  Visit Douglas's Homepage
I recomend something a bit more substantial. Do you realy want to trust your boat to a fence post ? 4X4 isn't even the true dimention of the wood. 4X6 or 4X8 Why take a risk for only a few dollars.

Doug&Ruth
Triska (Alberg 29)
Tacoma Wa.
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OJ
Master Marine Consultant

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USA
4382 Posts
Response Posted - 11/02/2002 :  11:19:29  Show Profile
<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>
Its that time of year and I need to build a wood cradle for my C25 wing keel. Will 4"x4" treated wood timber be strong enough for the frame? They will work for the stringers (transverse pieces), but what about the fore and aft pieces. These will carry the weight when the hudraulic trailer moves the cradle and boat.
<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana, Arial, Helvetica" size=2 id=quote>
The answer to all your questions all depend on your design.

<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>
Any other suggestions?<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana, Arial, Helvetica" size=2 id=quote>
Have one made out of metal.



Edited by - OJ on 11/02/2002 13:04:23
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Dave Bristle
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Djibouti
10005 Posts
Response Posted - 11/03/2002 :  20:42:29  Show Profile
I've seen nice, maintenance-free wood cradles--their disadvantage is probably that they weigh more than iron posts and steel stringers. But the design should place almost all of the weight on the keel--the corner posts and stringers should only be holding the boat upright. In fact, you should either have adjustable corner pads or allow room for some shims to snug the corners to the hull without a lot of pressure. I'd probably go with 4x6 posts and 2x8 stringers, more for geometric stability than for load-bearing strength.

Dave Bristle - 1985 C-25 #5032 SR-FK-Dinette-Honda "Passage" in SW CT
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jm
Captain

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Canada
290 Posts
Response Posted - 11/04/2002 :  10:02:36  Show Profile
I have my Cat25 fin keel on a wooden cradle. It is made out
of 6x6" PT, (supports and cross members) and was built as a shipping cradle for a 30' C&C which weighs in at around 8300lbs.

I have a metal folding cradle made by the Cradle Shop that you can borrow or buy, if you are any where close to Toronto, Ontario.
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