centreboard case knees

   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?

Author	Message Share Topic Printable Version Delicious Digg Facebook Furl Google MySpace Newsvine reddit StumbleUpon Translate Twitter Windows Live Yahoo Bookmarks Topic Search Topic Options Post Reply Create New Topic
sawman Send Private Message Find Member's Posts Far too distracted from work Joined: 04 May 11 Online Status: Offline Posts: 205	Post Options Post Reply Quote sawman Report Post Quote Reply Topic: centreboard case knees 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?

JimC Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6660	Post Options Post Reply Quote JimC Report Post Quote Reply 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. Edited by JimC - 26 May 12 at 3:19pm

sawman Send Private Message Find Member's Posts Far too distracted from work Joined: 04 May 11 Online Status: Offline Posts: 205	Post Options Post Reply Quote sawman Report Post Quote Reply Posted: 26 May 12 at 5:50pm
	Cheers jim, I hadn't thought of that! sounds like a plan