Repair & maintenance: centreboard case knees

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centreboard case knees

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=9426
Printed Date: 14 May 25 at 4:05pm
Software Version: Web Wiz Forums 9.665y - http://www.webwizforums.com

Topic: centreboard case knees

Posted By: sawman
Subject: centreboard case knees
Date Posted: 26 May 12 at 2:09pm

I have just discovered that one of the centerboard case knees(the very front one, which has nothing else attached to it) on my old miracle needs replacing. The original is made of 8mm ply. I have in stock some 6mm ply, so I have 2 choices - use the 6mm as it is or laminate 2 pieces of 6mm (12mm). I don't really want to buy a sheet of ply to use about a 4 inch triangle

The question is do i need to use 12mm ply to do the job, or will 6mm be ok?

Replies:

Posted By: JimC
Date Posted: 26 May 12 at 3:14pm

Its not very hard to plane down plywood by a few laminations, especially you have a belt sander or a decent workbench and a sharp chisel, so why not thin down a suitable size lump of your 6mm to 4mm and laminate those together, with the thinned down faces on the inside?

I dn't suppose 6mm/8mm is that critical, especially if you doubled it for about 5mm at the glue surfaces, but you have to look at it for a good few years, and don't really want to be looking at it and thinking that the one odd knee looks bad, and you wish you'd done it properly.

And don't forget the option of turning up at the nearest boatbuilder with the price of a few beers and asking if he's got any offcuts the right size.

Posted By: sawman
Date Posted: 26 May 12 at 5:50pm

Cheers jim, I hadn't thought of that!

sounds like a plan