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Old 01-24-2012
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Cool Harness Attachment Backing? Is This Enough?

I purchased a attachment point to hook my tether to while I am in the cockpit. I plan to mount it just below the companionway in the cockpit so that I will be able to move about the entire cockpit and reach the base of the mast on my Montgomery 17.

The fiberglass at this spot is fairly thick, I'd guess at least 1/4" or more. I am wondering if what I have in mind is sufficient backing for the part.





The washers are fairly large and I think that they are sufficient backing for this application. I don't really have the capabilities to easily find and fabricate one large SS backing plate and I don't think a piece of 1/4" plywood would help all that much more than the washers.

If this isn't sufficient, can you recommend a cheap and easy solution to having adequate backing for this situation?
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Old 01-24-2012
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I think that should work. It has some substance to it.
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Old 01-25-2012
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There is always Garalite (G-10) as an option, but those fender washers should work fine I'd think.
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Old 01-25-2012
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Aluminum is a good option as well. Scrap is not expensive and it is easy to work with.
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Old 01-25-2012
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I always double up the thin fender washers. When they bend they actually crush the glass underneath and start to weaken the structure.

Gary H. Lucas
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Old 01-25-2012
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Quote:
Originally Posted by GaryHLucas View Post
I always double up the thin fender washers. When they bend they actually crush the glass underneath and start to weaken the structure. Gary H. Lucas
That helps but you can also buy thick fender washers that don't cup the way the thin ones do.

Miti has it right though - hit a metal scrapyard and buy a scrap hunk of 1/4" aluminium plate and make a proper backing plate. You can work it with wood tools for the most part. It's stronger, neater and you get some satisfaction for a custom job, well done. If you have access to a halfway decent scrap metal dealer, it will only cost a couple of bucks for a small piece a couple of feet square.

You'll probably enjoy it so much you'll use the big chunk of leftover alloy to make new backing plates for all your hardware. Don't forget to chamfer the boltholes in your deck so they'll hold some sealant when you mount the fitting.
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Old 01-25-2012
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Just make sure that if you fall off the back...

... you won't be stuck in the propeller zone. Very bad.
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Old 01-25-2012
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I used thick fender washer and Wichard folding padeye for all of my cockpit mountings. I wanted to use a solid backing plate, but with the cabin liner in the way, I couldn't get to the back without cutting a large hole. I ended up drilling a center hole of 1 1/4" and feed the three washers through this hole. The liner was then covered with a white plastic plug.
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