Narrow vegi fiber backing?

gduff2
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gduff2
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Joined: June 18th, 2005, 4:58 am

September 5th, 2006, 4:26 pm #1

I'm thinking about backing a 62" long and 1 1/2" wide red oak bow with jute or hemp twine. I was concerned that it would over power the red oak. I also remember reading about using a narrow boo slat to back a bow instead of using full width boo. Could the same principle be used with hemp backings? That is to make a 1" wide stripe of hemp down the back of my 1 1/2" wide bow. Could such a bow be made to have trapazoidial x section?
Garrett
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Tim Baker
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Tim Baker
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Joined: May 23rd, 2005, 6:22 am

September 6th, 2006, 1:38 am #2

gduff2: The back of the bow is feeling something like 2500 lbs of tension. As long as your backing in no stronger than that you won't overpower the belly. That would be about 12 bowstrings worth of linen, prestressed well, for example. About 6 bowstring worth, in trapezoidal form if you like, would provide good safety. Most of the hemp twine available is quite weak. Do a break test, then multiply. Prestress the twine almost to breaking before gluing down. Or else it will do little tension work and give less protection. Tim
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gduff2
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gduff2
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Joined: June 18th, 2005, 4:58 am

September 6th, 2006, 3:33 pm #3

Thanks Tim. I'm probaby just gonna do a rectangular x section now. There's no need for an inexperienced bowyer to do any funny stuff.Garrett
Garrett
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Rose418
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Rose418
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Joined: April 9th, 2008, 1:17 am

April 28th, 2008, 4:30 pm #4

I was at an auction and recently bought a reel of flax string which had been in the possession of a harness maker. I would like to use it as a backing for a white oak bow that is too elastic to have respectable poundage. I tillered the white oak bow in the way you described in Volume IV TBB. It turned out lightweight, only 35#. It has a pretty even tiller so I thought the flax/linen string would be able to raise the poundage, preferably about 10#. My question to you is, Is it possible to string the bow into a mild reflex and be able to apply the linen string--how would one hold the string in place? I thought of using an Ace bandage and wrap and glue as you go. I wonder how to keep some tension on the applied string. Perhaps you have some technique to mention. I would appreciate any ideas, otherwise I will have to engage in trial and error experimentation.
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toxophileken
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toxophileken
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Joined: January 15th, 2006, 4:55 am

April 29th, 2008, 6:24 am #5

You have posted in a "read only" area... I'm going to copy this over to the main forum, so you have a chance of getting an answer.

Here's a link to the thread in the Primitive Archery forum:

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Ken
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