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Old 10-07-2017, 07:18   #16
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Re: G10 FR-4 Backing plates

If you don't mind ordering from US, try McMaster-Carr. Tons of sizes

www.mcmaster.com
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Old 10-07-2017, 07:26   #17
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Re: G10 FR-4 Backing plates

Hi Opie91

I'll have a look at McMaster-Carr

I'm waiting on a quote from the UK we see what they come up with, any ideas of price ?
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Old 10-07-2017, 08:13   #18
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Re: G10 FR-4 Backing plates

Jamestown Distributors have lower prices than McMasterCarr for what looks like the exact same stuff. They also sell precut smaller sizes, great for backing cleats, blocks, and so on.
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Old 10-07-2017, 08:15   #19
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Re: G10 FR-4 Backing plates

Thanks MarkSF I'll have a look at the website,

It all depends on how much they charge for delivery the boats in Italy and I'm in Basel, Switzerland.

We see, thanks
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Old 10-07-2017, 08:25   #20
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Re: G10 FR-4 Backing plates

Practical Sailor had a nice write up on backing plates.

One new thing for me was the recommendation to taper the edges to avoid a sharp transition in forces.

https://www.practical-sailor.com/iss...e_12058-1.html
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Old 10-07-2017, 08:43   #21
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Re: G10 FR-4 Backing plates

Another cutting method is a saber saw with a carbide grit blade. These do not dull much and last a long time if not pushed too hard
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Old 10-07-2017, 12:08   #22
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Re: G10 FR-4 Backing plates

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Originally Posted by Madrugada View Post
Hi Stumble,

What thickness did you use in the areas of standing rigging and how did you install,

With thickened epoxy and fiberglassing over the top of the G10 ?
To use G-10 mix up some epoxy with thickener and apply a 1/8" coat to the entire backing plate, then press it into place. Some of the epoxy should flow out. Clean this up with your finger (in gloves), just like applying caulk you want to leave a quarter round in place.

In a few hours once it has cooked off drill out the mounting holes and bolt in place. You do not need to cover the backing plate with anything.

For lightly loaded stuff like deck hardware and anything not in huge tension I use 1/8" G-10, for heavy loads (winches, deck cleats, etc) use 1/4. Assuming a ~40' boat. For big boats you need to run numbers.
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Old 10-07-2017, 12:24   #23
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Re: G10 FR-4 Backing plates

Thanks Stumble,

So me using 1" thick block of G10 as a backing plate for U bolts to hold inner and outer shroud's in place would be advisable, obviously the block would be cut to size to fit the area let's say 5" by 10' inches

Any tips ?
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Old 10-07-2017, 13:42   #24
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Re: G10 FR-4 Backing plates

1" is insainly oversized. Those would be thicker than the backing plates we used on a 70' maxi sleds primary winches.

But if you are mounting them in place of old chainplates I would just match what was there. Surface area I more important than thickness. Thickness determines how much they flex, surface area determines how likely they are to rip thru the deck.
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Old 10-07-2017, 16:40   #25
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Re: G10 FR-4 Backing plates

I'm not sure what material you have in mind, But I've got a 5'X10' X 1/2" sheet of solid arborite so I've been told from where I got it. It's the hardest, toughest material I ever laid my hands on. I've been using 3/16 SS plate until you mentioned this G10 FR-4 stuff thanks for the Idea.
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Old 10-07-2017, 17:26   #26
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Re: G10 FR-4 Backing plates

Having been a Shipwright and rigger for many year's and understanding that the rig is attached to U-bolt's thru the decks, supposedly without a mishap.The thing is 1/2" deck isn't all that strong and spreading the load only helps so much, if you could transfer the load via a turnbuckle lower down to a bulkhead or what ever, it would help alot without a major rebuild, transferring the load [ubolt thru deck] is used alot on modern designs, one needs to think in terms of what will happen if a knock down happens and not lose the rig.
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Old 10-07-2017, 17:39   #27
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Re: G10 FR-4 Backing plates

I have used some G-10 as backing plates and pads on my boat with good success. I got mine on eBay as it was difficult to source in Canada at the time. I cut mine with a diamond blade in a cheap ceramic tile wet saw. Works great and pretty much dust free.
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