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    Compound system Vs power strike

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    Kali
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    Join date : 2010-01-29

    Compound system Vs power strike

    Post by Kali on Sat Feb 06, 2010 12:31 am

    Hi there,
    Planning the limbs shape/ length/ strength for my reverse limb crossbow project, this morning i've made several silly measurements using a toy crossbow (reverse limb configuration, with 45% angle between limbs):
    I measured the differences between limbs' tops with the crossbow cooked and not-cooked
    1. classical setup: the rope was secured at the both ends of the limbs without any pulley:
    the limbs' variation of 40cm for a draw length of 19 cm - so, as expected, the report is about 1/1 (1 cm draw length = 1 cm of each limb movement)
    2. "semi-compound" setup: two pulleys were attached to the limbs tops and the wire was one piece encircling the pulleys:
    limbs' variation of 30 cm for a draw length of 30 cm - again, as expected, the report is 1/2 (1 cm draw length = 1/2 cm of each limb movement)
    3. compound setup: the rope coming from a pulley was attached at the end of the opposite limb:
    limbs' variation of 16 cm for a draw length of 32 cm - the report is about 1/4 (1 cm draw length = 1/4 cm of each limb movement) - I don't know why, but i was always convinced the the compound report should be 1/3 ... maybe because I was seeing just 3 wires Smile)

      Current date/time is Sun Feb 25, 2018 6:45 pm