Author Topic: Sinew patches over yew knots?  (Read 2171 times)

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Offline poplar600

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Sinew patches over yew knots?
« on: November 18, 2015, 05:19:34 pm »
Got a fairly clean back on the yew ELB I'm making. Couple of ring violations here and there, but not too bad. Left extra wood around knots and pins (wider and islands). Shooting for around 85-90lb @30. Bow will be 81 inches long, so 80 inches nock to nock.

Was thinking about adding small sinew patches over the knots and pins for extra security? Not backing it, but just single layer small patches.


All help and advice would be awesome!!!!!!

Offline wizardgoat

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Re: Sinew patches over yew knots?
« Reply #1 on: November 18, 2015, 06:35:12 pm »
In yew, if knots are solid they can be harder than the wood it self. If they are soft it's better to dig them out and fill with sawdust and glue. Yew can tolerate some gnarly stuff and still make good bows, but for higher weights its a bit of a gamble. Post pics for better advice.
Sinew patches could add some assurance, but would be kind of ugly in my opinion

Offline poplar600

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Re: Sinew patches over yew knots?
« Reply #2 on: November 18, 2015, 06:38:48 pm »
Dug it out and filled with sawdust/resin, left an island of wood and gave extra width. Just want to be totally sure.

Offline poplar600

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Re: Sinew patches over yew knots?
« Reply #3 on: November 18, 2015, 06:39:29 pm »
Jest left small islands of sap round the pins

Offline PatM

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Re: Sinew patches over yew knots?
« Reply #4 on: November 18, 2015, 08:31:38 pm »
   Doesn't seem like the bow will be strained enough at that length/drawlength and comparatively low draw weight to warrant that.

Offline poplar600

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Re: Sinew patches over yew knots?
« Reply #5 on: November 18, 2015, 09:11:42 pm »
To warrant the length?

90lbs@30 is still putting a lot of strain on the wood.

Offline PatM

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Re: Sinew patches over yew knots?
« Reply #6 on: November 18, 2015, 09:18:51 pm »
 At 80 inches it is not. A 90 pound pow could be almost a foot shorter before you could start thinking that.

Offline PatM

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Re: Sinew patches over yew knots?
« Reply #7 on: November 18, 2015, 09:34:17 pm »
To warrant the length?

90lbs@30 is still putting a lot of strain on the wood.
No, to warrant putting patches on.  A bow doesn't really register that sinew is on the back until it is asked to actually take up some tension duty.

Offline Del the cat

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    • Derek Hutchison Native Wood Self Bows
Re: Sinew patches over yew knots?
« Reply #8 on: November 19, 2015, 03:33:21 am »
Personally I'd either leave it or take out a shallow scoop and put on a patch of Yew sapwood, for an almost invisible fix.
Del
Health warning, these posts may contain traces of nut.

Offline poplar600

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Re: Sinew patches over yew knots?
« Reply #9 on: November 19, 2015, 04:57:34 pm »
At 80 inches it is not. A 90 pound pow could be almost a foot shorter before you could start thinking that.

Not an English longbow

Offline WillS

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Re: Sinew patches over yew knots?
« Reply #10 on: November 19, 2015, 08:47:41 pm »
80" is massive for an English Longbow / Warbow.  Considering the MR bows were on average 160lb and usually under 75" nock to nock, making a 90lb bow 80" long is daft.