Backing Plate for Swivel Cam Installation
- Thread starter jbrock
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I made mine of epoxy coated 3/8" marine plywood, sealed to the hull with 4200. Given the thickness of the hull in that area , that should be plenty strong. If you want aluminum, you will have to fabricate them yourself. 3/16" should be thick enough, but you will have to protect against corrosion.
Tim
Tim
Think about it
You want to keep the water OUTSIDE the boat, right? And you don't want to trap water that MAY get in between the outside and the inside because it'll sit there and rot the balsa core of your deck between the outside fiberglass and the inside liner (if that's what your boat is made from).
So, use sealant on the outside, not the inside.
You want to keep the water OUTSIDE the boat, right? And you don't want to trap water that MAY get in between the outside and the inside because it'll sit there and rot the balsa core of your deck between the outside fiberglass and the inside liner (if that's what your boat is made from).
So, use sealant on the outside, not the inside.
Why not just make up a fiberglass backing plate. They're pretty easy to layup and you can make them almost any size/shape you need.
Your boat has no core where you are going to mount that, use 4200 between the base and the hull, I stick the reinforcement on with 4200 mostly so it stays where I put it, baltic birch plywood from HD will work if you can't source marine ply, especially if you coat it in epoxy first. sticking it to the hull with epoxy would be better, but messy and permanent if you change your mind. If you get serious about it, you are probably going to want to change to midboom sheeting and a traveller eventually. Like this.
edit, oops not the pic I thought it was,
but you get the idea
edit, oops not the pic I thought it was,
but you get the ideaAttachments
Thanks, Tim. You have tried to sell me on that traveller before. I just needed a good fix to a bad mainsheet system, and didn't want to get into all that right now. So if I use 4200 I'll be able to remove the cam base without too much trouble when I go to install my midboom sheeting system? Many thanks.
No. 4200 is not very easy to remove. Just slightly easier than 5200. Use Butyl and you will have less chance of leaking and it will disassemble very easily.
But wait, there's more...
Seriously some of these guys know a lot more about this stuff, I just know the boat, haven't tried the butyl on the boat, but I have used it on cars. AFAIK it only comes in black though. One thing you don't want to use is silicone sealer though.
Seriously some of these guys know a lot more about this stuff, I just know the boat, haven't tried the butyl on the boat, but I have used it on cars. AFAIK it only comes in black though. One thing you don't want to use is silicone sealer though.
Grey butyl is available at any good RV store.
The ONLY time to seal a backing plate to the inside of the boat is if you are going to epoxy it in place and drill the whole stack. This can make sense if adding something like a big winch to a cored deck, or cleats to a cored deck. You will also be removing some core.
Take the pot and re-drill advise seriously; a wet core is one of the few things that will kill a FRP boat.
There is no point in getting into sailing if you aren't going to get into fabricating your own stuff!
Fiberglass cut-outs from boat yards are a good choice for backing plates. I've used pieces from trashed boats and FRP tanks.But wait, there's more...
Seriously some of these guys know a lot more about this stuff, I just know the boat, haven't tried the butyl on the boat, but I have used it on cars. AFAIK it only comes in black though. One thing you don't want to use is silicone sealer though.
The ONLY time to seal a backing plate to the inside of the boat is if you are going to epoxy it in place and drill the whole stack. This can make sense if adding something like a big winch to a cored deck, or cleats to a cored deck. You will also be removing some core.
Take the pot and re-drill advise seriously; a wet core is one of the few things that will kill a FRP boat.
There is no point in getting into sailing if you aren't going to get into fabricating your own stuff!
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