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i think……you can try a Pistol grip……just like a chinese crossbow ......
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Various torsion weapons saw use in medieval times until replace by gunpowder weaponry. |
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Oh, and apparently there are claims of 1,000+ yards for triple crossbows. |
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One big difference between the European single bow crossbows and the Chines triple bow crossbows seems to be that the power stroke and the bolt are much longer, so probably they get a lot more speed out of their crossbows because of better use of the stored energy in the bows. |
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Keep in mind that my drawing is a fantasy design and if it was to be actually made it would need more attention to details like friction that could wear away the crossbow string and how it would be armed using a pulley system. |
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Although we do see the Asian reconstruction that has no sheaves, maybe they just accepted a lot of broken strings |
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Many early machine parts were made from Lignum Vitae and were not excessively heavy and lasted for years under very taxing mechanical strains |
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don't see why the sheaves or rollers would negatively impact the efficiency of a triple cross bow when the cams of a compound bow don't seem to be a problem. |
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Part of the issue regarding range comes from interpreting the pu/pace unit of measurement. |
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Also note that reconstruction performance varies. Firefly far outperforms any other Roman ballista reconstructions. Just because nobody's done it yet doesn't mean it didn't happen back when these things were more than curiosities. |
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From the equations above we can compute our exit velocity based solely on our construction variables (overall size and spring size). Using our Medieval Balista we've computed and exit velocity of 132m/s however field testing and high speed photographs showed an exit velocity of around 120 m/s. |
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McEwen, E., "The Bow of the Ox", Journal of the Society of Archer-Antiquaries, 1985, Vol. 28, pp. 15-21. He details a reconstruction he made with straight self bows that had an extraordinary draw length and was very efficient. It details the different strengths that the bows must have to draw evenly (i.e the forward bow must have half the draw weight of either of the two rear bows). He speculated on the potential performance of a similar set up with composite bows and believed it might have equalled the historical accounts. [ Linked Image ] |