Main Discussion Area > Horn Bows

effect of sijahs on draw weight

<< < (2/4) > >>

loon:
Well, if you put levers on them, then the inner limbs won't be bending as much for the same draw length, but the same amount of movement by the limbs moves the arrow more than without the levers, so it might give the bow a mechanical.. advantage? or disadvantage? Not the best at physics.

stuckinthemud:
I think that is true, a huge mechanical advantage - short, fat, strong working section to the limbs can be bent by a lever more easily than without, with the bonus that the lever also maintains a decent string angle; just wondered if anyone knew how much of a mechanical advantage levers offered - if it can be calculated then the ideal length for the levers could be found for a given design?

loon:
I think the ideal length of levers could change given materials, arrow weight and draw length..

mikekeswick:
A recurved tip (of any kind) simply reduces the angle between the string and the tip thus giving greater 'advantage' over the increased angle you would have without them.
This allows you to bend a thicker limb for the same effort on your fingers. Storing more energy during the draw as a result.
Horn and sinew have the capacity to store more energy for a given weight compared to wood alone - that is why the composites can be better bows if designed correctly.

stuckinthemud:
Thanks for clarifying that Mike, I was visualising it more as a lever/fulcrum thing, but is there any way of quantifying the advantage - longer recurves, greater advantage. A two inch recurve would not reduce the effort as much as an eight inch one, but is there a rule of thumb here? You know like, every additional inch of recurve reduces effort by so-much %?

Navigation

[0] Message Index

[#] Next page

[*] Previous page