Main Discussion Area > Bows
Stress and performance
willie:
--- Quote from: Aussie Yeoman on July 03, 2022, 01:26:17 am ---
The thing is though that reducing strain means making it wider and thinner. Going in this direction increases the mass per unit of stiffness.
--- End quote ---
Aussie,
have you ever kept track of the grams/MPa of completed bows plotted against arrow speed ?
Aussie Yeoman:
Do you mean grams of bow mass against the stiffness or stress of the timber against arrow speed? No, I haven't. Could be interesting though.
willie:
--- Quote from: Aussie Yeoman on May 17, 2024, 10:02:42 pm ---Do you mean grams of bow mass against the stiffness or stress of the timber against arrow speed? No, I haven't. Could be interesting though.
--- End quote ---
grams of mass/MOE as determined by a bend test of the wood.
I guess you could calculate out the actual stress.........
but either way, you would need a bend test of the wood for the next bow to plan acordingly.
Aussie Yeoman:
Oh! Yes, I have. When I've done bend tests in the past I've most usually also measured density.
Alas, all my data are on a computer that recently died and I've not yet tried to rescue them. But the data do exist.
willie:
Arvin,
if you overbuilt the entire linb you would lower the actual stress throughout the entire limb, which might incur a mass penalty. I dont think it matters if the first few inches coming out of the fades were thicker or wider so long as its stiffer.
Badger used to leave the inners on the stiffside as he tillered out, and brought the bend in towards the handle more if it looked like he was getting too much set too early. My guess is that near handle set is to be avoided more over set taking further out. Perhaps he is reading along
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