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Offline Scallorn

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ERC question
« on: May 20, 2017, 10:27:15 pm »
I have an ERC stave about 76 inches long by about 1 and 1/2 inches wide with a 50/50 heart/sap ratio. Will this make an English longbow? It's almost flawless
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Offline gfugal

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Re: ERC question
« Reply #1 on: May 20, 2017, 11:01:55 pm »
I imagine it should if you keep it long
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Offline PEARL DRUMS

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Re: ERC question
« Reply #2 on: May 21, 2017, 09:18:48 am »
Id suggest rawhide backing.
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Offline Scallorn

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Re: ERC question
« Reply #3 on: May 21, 2017, 12:18:41 pm »
I've been told that you have to tiller erc slower otherwise it can explode. Is a rawhide back completely necessary? I was hoping to go for a low stress cross section and not have to back it
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Offline Pat B

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Re: ERC question
« Reply #4 on: May 21, 2017, 05:36:44 pm »
Keep as much sapwood on the back and be very careful around any knots or pins. Although rawhide backing isn't necessary it is very good insurance.  ;)
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Offline upstatenybowyer

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Re: ERC question
« Reply #5 on: May 21, 2017, 05:44:54 pm »
Quote from: Pat B on May 21, 2017, 05:36:44 pm
Keep as much sapwood on the back and be very careful around any knots or pins. Although rawhide backing isn't necessary it is very good insurance.  ;)

+1 and I'll add that if it were me, I'd start wide, like 2" wide and thick. I'm finishing up an ERC ALB that pulls 50# right now. It's backed with goat rawhide (dries clear), is 2" wide out of the fades to mid limb and it's around 3/4" thick out of the fades tapering from there. With ERC it seems to take a lot more wood than with a high density wood to do the job. But that's okay cause it's light as a feather!

Good luck!
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Offline Mo_coon-catcher

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Re: ERC question
« Reply #6 on: May 21, 2017, 06:34:07 pm »
And a coat of sinew REALLY seems to stiffen up ERC if you end up coming out a bit under weight. I've gt a ELB roughed out of ERC for about a year now that I've gotta finish shaping and start bending. My plan was to leav it with a sapwood back, leaving it flat and heavily rounding the belly to take some strain off he back. Sknce t seems so weak in tension compared to compression. My stave is similar dimensuons. I might make it one of my next bows I work on to see for myself how well it works unbacked.

Kyle
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Offline loon

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Re: ERC question
« Reply #7 on: May 22, 2017, 01:00:48 am »
If you follow this series, Dave Mead shows how to make a pretty narrow longbow out of ERC.

Code: [Select]
https://www.youtube.com/watch?v=ONesRn82OYE
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gutpile

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Re: ERC question
« Reply #8 on: May 22, 2017, 02:02:02 pm »
personally I would back it.. especially if you are wanting over 50 lbs draw weight..gut
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Offline PatM

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Re: ERC question
« Reply #9 on: May 22, 2017, 08:36:56 pm »
Marc St Louis posted a heavy ERC warbow that was unbacked.
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Offline DC

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Re: ERC question
« Reply #10 on: May 23, 2017, 09:57:14 am »
Yeah but Marc can make a silk purse out of a sows ear ;D
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gutpile

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Re: ERC question
« Reply #11 on: May 23, 2017, 12:05:55 pm »
Yeah but Marc can make a silk purse out of a sows ear ;Dention.......haha

for the work that goes in one, not to mention how hard it is to find a clean stave, its not a bad idea to back ERC.. tiller has to be spot on perfect for a hunting weight bow unbacked... gut
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gutpile

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Re: ERC question
« Reply #12 on: May 23, 2017, 01:25:54 pm »
as for tillering slower.... I'd say no... cause ERC tills fast..wood is so soft, I tilled mine with sandpaper.. gut
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