Join Date: Oct 2007
Thanked 62 Times in 53 Posts
Rep Power: 8
Re: Chain plates
Pretty much any thing you can do to get the wood replaced and strong will work.
Sometimes replacing a whole bulkhead is the the easiest best way to go.
You can however patch plywood and have it as strong as original by cutting a piece out and tapering what is left (scarf) back 8 to 1. so for a 1/2" thick board taper it back 4 inches.
Then fit in a new piece with a matching taper and set it a bed of epoxy.
The fein multimaster or good quality clone is a good tool for close work and may even help in some places with the taper.
The taper don't have to be perfect it can even be chiseled in places. The thickened epoxy can fill and eight inch easy.
Then if you cover the plywood with a couple layers of epoxy and glass cloth it will be very strong.
All depends on exactly what you can get to and what is rotten.
Good quality plywood with a lot of layers with no internal voids is much stronger than lumber store wood too if you can find it and are willing to pay for it.
It is worth getting a book or two on the subject as their are lots of ways to do it wrong.
You are unbelievably lucky you didn't get hurt or break the rig.
The lesson from the Icarus story is not about human failing.
It is a lesson about the limitations of wax as an adhesive.
If you have an engineering problem solve it.
Last edited by davidpm; 08-12-2013 at 06:32 PM.