broken daggerboard
Printed From: Yachts and Yachting Online
Category: General
Forum Name: Repair & maintenance
Forum Discription: Questions & tips on the subject
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=1783
Printed Date: 26 Jun 25 at 5:51pm
Software Version: Web Wiz Forums 9.665y - http://www.webwizforums.com
Topic: broken daggerboard
Posted By: ModifiedC-Class
Subject: broken daggerboard
Date Posted: 19 May 06 at 4:30pm
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snapped a dagger board on our old C-Class cat yesterday screaming along at 20knots and all of a sudden bang followed by a shudder thought what the hell was that looked up at the rig expecting the worst but couldn't see anything amiss ( we where struggling back across the solent in what we later found out was 28 to 30 knots of wind that was gusting to nearly 40 knots ) it was only when we got back to Calshot that we realised we now had a very short board.
Anyway the daggerboards are Grp moulded using chopped mat with wooden strengthening battens, I can take a pair of moulds from our surviving board easily enough but would like some advice on strengthening the design as the other board is cracked as well ( PS they are 6ft long)
------------- I refuse to tip toe gently through life only to arrive safely at death |
Replies:
Posted By: Isis
Date Posted: 19 May 06 at 5:02pm
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Initial impression is that the flaw lays with the fact there seems to be a bit too much chopped strand in your carbon layup...
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Posted By: Jack Sparrow
Date Posted: 19 May 06 at 5:10pm
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Make it out of foam with some carbon stringers. Or infact make it out of
foam with anything but chopped strand mat! 
go here for a bit more info and some nice How To Do it Videos..... http://www.sailingsource.com/cherub/chframe.php?menu=build or you could PM me and I'll send you the mpeg if the website ones are to small. ------------- http://www.uk3-7class.org/index.html" rel="nofollow - Farr 3.7 Class Website https://www.facebook.com/groups/1092602470772759/" rel="nofollow - Farr 3.7 Building - Facebook Group |
Posted By: Captain Aris
Date Posted: 02 Jun 06 at 11:40pm
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It looks like the wood is there not so much as added strength as for shaping the internal ribs which give the dagger board extra stiffness. In view of your experience I would mould the new daggerboard with roving or glass cloth rather than chopped mat. At least some glass cloth on the outer surfaces. And I would make the walls a bit thicker than they are. I think it is also a good idea if you can manage to get the internal ribs to meet exactly along the center line. ------------- Beware of more sail than ballast. http://www.CaptainAris.com - My Site mailto:Aris@CaptainAris.com - e-mail |