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effect of sijahs on draw weight

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stuckinthemud:
Ok, so the purpose of levers on lever-arm bows is to reduce the effort but by how much? Is a Turkish or Magyar drawing at 57# apparent weight actually pulling at 75#? How can we calculate the effect of sijahs on draw weight?

loon:
it'd be a lot more if you put the strings on the "knees" (where bending limbs and levers meet)
I think it's to have a fatter draw/force curve, make the short bow less stacky..

mikekeswick:
Too many factors to consider to know 'how much' for various different designs.
The whole idea is simply to reduce string angle. Cut the tips off any recurved bow and see how it feels without them ;)

loon:
If you had a Molle and a pyramid, both with even bend on the bending limbs, same max width, same length ntn, same brace height, both straight bows, same draw weight at 28", I think the molle would have a "fatter" draw force curve. Stores more energy.. would it not?

stuckinthemud:
I kinda want to keep this really simple and really basic, as Loon says, if the strings were on the knees of the limbs then they would be much harder to draw - for the purpose of this question, I would say that was the 'true' draw weight, the weight of the bow if the string were at the end of the working section of the limbs.  If you put a lever on the end of the limb, that reduces the effort required - like putting a torque lever on a jam-jar lid when its stuck.  Is one of the reasons that horn bows are so effective is that the use of levers moves impossibly powerful bows within the capability of the archer to draw them?

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