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Draw weight Quandary
adb:
How's this for a knot on the edge? No problem for yew... ;)
Archeress:
vERY nOICE....Yew bewdy.
mikekeswick:
--- Quote from: adb on December 30, 2013, 09:57:02 am ---How's this for a knot on the edge? No problem for yew... ;)
--- End quote ---
Yes but it's right at the tip where the stress is much lower than further towards the grip. The tips on most bows are actually overbuilt when you look at the amount of stress there...and I don't just mean 3/4 wide tips!
Yew isn't magical...i've had yew bows fail at knots just like any other wood. It very much depends on the particular stave and the particular knot. Not all knots are created equal ;)
Early stack is not stack....it's high early weight because the wood hasn't been overstrained and is therefore still springy. Bows with set are easy to draw intially. Straight or reflexed bows give you the early weight.
My advice if you are struggling is to drop your weight to a point that is comfortable for at least a handfull of shots or else injury is around the corner....sure as eggs is eggs. Better to build up very slowly - I wouldn't jump bow weight by more than 5 - 8 lbs at a time.
WillS:
--- Quote from: mikekeswick on December 31, 2013, 07:05:36 am ---Early stack is not stack....it's high early weight because the wood hasn't been overstrained and is therefore still springy. Bows with set are easy to draw intially. Straight or reflexed bows give you the early weight.
--- End quote ---
Cheers for that Mike! Knew "Stack" was the wrong term really, but didn't know how else to describe it. So it really is down to very good tillering and minimising set that gives you the high performance bows - sounds pretty darn obvious now!
adb:
--- Quote from: mikekeswick on December 31, 2013, 07:05:36 am ---
--- Quote from: adb on December 30, 2013, 09:57:02 am ---How's this for a knot on the edge? No problem for yew... ;)
--- End quote ---
Yes but it's right at the tip where the stress is much lower than further towards the grip. The tips on most bows are actually overbuilt when you look at the amount of stress there...and I don't just mean 3/4 wide tips!
Yew isn't magical...i've had yew bows fail at knots just like any other wood. It very much depends on the particular stave and the particular knot. Not all knots are created equal ;)
Early stack is not stack....it's high early weight because the wood hasn't been overstrained and is therefore still springy. Bows with set are easy to draw intially. Straight or reflexed bows give you the early weight.
My advice if you are struggling is to drop your weight to a point that is comfortable for at least a handfull of shots or else injury is around the corner....sure as eggs is eggs. Better to build up very slowly - I wouldn't jump bow weight by more than 5 - 8 lbs at a time.
--- End quote ---
And that's exactly why I laid out the bow with the edge knot as close to the tip as possible. Being a warbow, however, I'm surprised it held up. I certainly worry less about knots in yew than any other wood.
I agree with the 'stack' term. Strong early draw weight is a good sign of any well made bow, with low set and minimal stress due to proper tiller. 'Stack' is the inability of wood to bend any further, and can be caused by several factors.
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