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New project
PatM:
Here's a sinewed bow with no horn showing similar structure with short bending limbs and long relatively static outer portions.
https://www.youtube.com/watch?v=vxCqekHiAaM
DC:
--- Quote from: willie on March 23, 2019, 12:45:32 pm ---
--- Quote --- but I've been through this before, you have to take an awful lot off the tips to make any dif.
--- End quote ---
Don, I havent tried to plot your results as reported, but do you think the limb lightening has more of an effect on the lighter arrows?
--- End quote ---
I'm going to have to go with"I don't know". It's something I'm having a hard time wrapping my head around. I think the physics says the lighter it is the faster it can accelerate. I know there is a reason that "AA"Fuelers don't weigh 2 tons. Taking weight off the tips is taking weight off that is halfway(roughly) to the arrow divided by two tips. Dunno :D
maitus:
--- Quote from: DC on March 23, 2019, 10:07:35 am ---After a little work on the splice area it's 38#@28". 10gpp was 183fps, 8gpp was 198fps.
--- End quote ---
Srry, but its hard to believe :D. Its 17kg and 198 fps? Its about 40 fps faster than the same draw weight plastic longbow. My fastest bow has been sinew backed junniper and 230 fps. But it was 30kg draw :D. If Your crono is not out of order, then congratulation :D ! I would never be able to make such a efective bow.
I have a junniper/bamboo/sinew shorty in work and im very excited what will be the results :).
sleek:
--- Quote from: maitus on March 23, 2019, 01:37:31 pm ---
--- Quote from: DC on March 23, 2019, 10:07:35 am ---After a little work on the splice area it's 38#@28". 10gpp was 183fps, 8gpp was 198fps.
--- End quote ---
Srry, but its hard to believe :D. Its 17kg and 198 fps? Its about 40 fps faster than the same draw weight plastic longbow. My fastest bow has been sinew backed junniper and 230 fps. But it was 30kg draw :D. If Your crono is not out of order, then congratulation :D ! I would never be able to make such a efective bow.
I have a junniper/bamboo/sinew shorty in work and im very excited what will be the results :).
--- End quote ---
Plastic makes a terrible bow. So does glass, it just lasts longer. Natural materials outperform every time when the builder knows what he is doing.
Draw weight has 0 zero, zip, zilch, nada, to do with arrow speed, its all about stored energy, effeciency, and arrow weight. I can assure you, his chrono is in working order.
You could make a bow like that, if you study this thread well. I think it should be stickied for all future refernces on how to build a bow.
maitus:
My last bow, i have made for my son, is elm selfbow 19 kg at 29 inch draw. It makes 170 fps with 32 grams arrow. I think its not very bad either :D...
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