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Tiller help
Hamish:
Draw length, 12" -14"(?), so I'm guessing you would need at least 150lbs to get the performance of a 50 lbs hand drawn bow?
stuckinthemud:
Draw length is 12”. I reckon that due to slow draw and long long long hold time before release compared to a hand bow (maybe a 10 or 15 second cycle instead of 3 to 5 seconds for a hand bow?) the stresses are huge, so you need a draw length to bow length ratio nearer 1:3 than the 1:2.4 for a hand bow. This is inefficient and coupled to sliding the string along the bow table means medieval crossbows push out 1/3 power compared to handbows. I will be disappointed if it’s much under 200lb . Am really tempted to give it a gentle heat soak
stuckinthemud:
Well, that’s disappointing. At 12” it’s 150lb. If I pull it to the correct draw for a hand bow that’s 180lb at 14”.
That’s still equal to a 50lb hand bow, so a nice weight for target and hunting and really low stressed/very over built. If you were me, would you tweak it - flipped tips/recurve/maybe extend the tiller an inch - or just leave it alone and have a fun, reliable bow?
superdav95:
--- Quote from: stuckinthemud on August 05, 2024, 12:28:10 pm ---Well, that’s disappointing. At 12” it’s 150lb. If I pull it to the correct draw for a hand bow that’s 180lb at 14”.
That’s still equal to a 50lb hand bow, so a nice weight for target and hunting and really low stressed/very over built. If you were me, would you tweak it - flipped tips/recurve/maybe extend the tiller an inch - or just leave it alone and have a fun, reliable bow?
--- End quote ---
I might just leave it alone and continue with the rest of the build and enjoy it. I know its not quite the draw weight you were hoping for but still quite good.
pierce_schmeichel:
If you're comfortable with sinew backing and you're not satisfied with the draw weight I would sinew back it. It's the perfect candidate, being a shorty.
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