Main Discussion Area > English Warbow
Beep Beep Beep Tiller!!!!!!!
Del the cat:
--- Quote from: toomanyknots on November 07, 2013, 03:37:58 pm ---But what about potential stack towards fulldraw? And what about the opposite with reflexed bows? As well as length seems to make a huge difference.
--- End quote ---
I'm talking about sensibly designed ELBs which are surprisingly linear, from my experience.
Although I have had the misfortune to try to draw a horrid Italian Yew warbow with a belly that had a load of untreated knots so when it got to about 2/3 draw they all pinched up and it stacked solid. Kicked like a mule.
Anyhow it's just a way of estimating, it doesn't matter how much sophisticated maths, computer analysis or 3D modelling you apply... none of it will effect the actual reality!...
Maybe the simple rule of thumb add 20# is close enough for jazz?
Del
Bearded bowyer:
Lots to think about ::)
other than this occasion and one other ash, end grain on, tri-laminate bow, I haven't had a problem taking them to 32" for a second just long enough to check the draw weight then winding them back down again. I am mostly a laminate bowyer. Not sure I would do it with a single piece bow, but like toomanyknotts I don't want anyone coming back unhappy.
I think I will make some drastic changes to my tiller so it can't get stuck!
BUT I will be much more careful when my hazel staves are ready next year!
I've got a some target archers wanting light warbows at the moment....can't wait to see them try to use them ;D >:D
Bearded bowyer:
oh by the way..
I'm going to continue to use the bow as a 28" target bow. I will keep a close eye on the chryshal and let you all know how she gets on.
Thanks everyone
Matt
toomanyknots:
--- Quote from: Del the cat on November 07, 2013, 04:17:37 pm ---
--- Quote from: toomanyknots on November 07, 2013, 03:37:58 pm ---But what about potential stack towards fulldraw? And what about the opposite with reflexed bows? As well as length seems to make a huge difference.
--- End quote ---
I'm talking about sensibly designed ELBs which are surprisingly linear, from my experience.
Although I have had the misfortune to try to draw a horrid Italian Yew warbow with a belly that had a load of untreated knots so when it got to about 2/3 draw they all pinched up and it stacked solid. Kicked like a mule.
Anyhow it's just a way of estimating, it doesn't matter how much sophisticated maths, computer analysis or 3D modelling you apply... none of it will effect the actual reality!...
Maybe the simple rule of thumb add 20# is close enough for jazz?
Del
--- End quote ---
Okee dokey, makes sense. :) Thats crazy about knots in a bow causing it to stack!
--- Quote from: Bearded bowyer on November 07, 2013, 05:58:27 pm ---Lots to think about ::)
other than this occasion and one other ash, end grain on, tri-laminate bow, I haven't had a problem taking them to 32" for a second just long enough to check the draw weight then winding them back down again.
--- End quote ---
That's kinda what I do, I just don't use a winch.
--- Quote from: Bearded bowyer on November 07, 2013, 06:01:13 pm ---oh by the way..
I'm going to continue to use the bow as a 28" target bow. I will keep a close eye on the chryshal and let you all know how she gets on.
Thanks everyone
Matt
--- End quote ---
In my experience, I've been lucky enough to get two different kinds of chrsyals. (depending on the wood sometimes) I either get lots of faint barely visible chrysals, usually in an area where the tiller is working more than anywhere else. I get these sometimes in mulberry, and have had them in a higher stressed linen backed osage bow. And the other kind will be just one or two, that go very deep. I had one single chrysal in a yellowheart bellied bow, it wasn't even bending (to my eye) anymore in that spot than anywhere else. I tried to do a patch and the chrysal went all the way to the core.
Del the cat:
@ Toomanyknots
You could see the pinches running out across the belly from each knot.
The knots were sound but the ring of black manky stuff round each knot wasn't solid and hadn't been filled or soaked in superglue.
The effect was like sawing slots across the belly every 12" or so going half way through the bow, so that they closed up at 2/3 draw.
It had tons of set and felt like a 50# bow until it got to about 26" .
It was a bow which had been returned to the bowyer and then sold on as a training bow... it's wasn't sold as perfect. But it's a great illustration of how Italian Yew isn't magic or all knot free perfect staves. Also a good illustration of how important it is to treat the manky stuff around knots.
Where a side branch grows over and forms a knot, the wood of that branch may be sound, but the bark and cambium becomes the black ring of worthless mush.
Del
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