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    Crusader crossbow

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    hullutiedemies
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    Crusader crossbow

    Post by hullutiedemies on Thu Mar 30, 2017 11:12 am

    This one of my 27 or so currently ongoing undocumented projects I think might actually be worth documenting as public service.

    Sort of a historical reconstruction.
    Idea is to build a simple wooden crossbow that would have been worth to bother to carry to a 12th century battlefield.
    So as minimum recuirement this has to have at least matching ballistics with a Mary Rose type longbow and preferably do better in some aspect.

    Bow here pulls 60kg with 25 cm draw, the full power stroke 38 cm, that makes ca, 90kg total draw weight
    (200#/15") so energy capacity should be about same as 120-150 pound longbow

    Rowan bow 55 x 35 mm middle 130 cm string, 20cm deflex, limbs are barely bend at brace height.
    I trust rowan to take 0.14 J/cm^3 , yew bow of equal power could be about 1/3 smaller.

    Birch tiller
    I roughed out the tiller with chain saw, so it needs some cleaning up. Thus temporary junk rope bridling and polypropylene string.Just to test the bow and trigger before proceeding any further.



    pin-lock with Lillöhus-style flexible tickler should be appropriate for period.
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    OrienM
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    Re: Crusader crossbow

    Post by OrienM on Sat Apr 01, 2017 7:58 am

    Neat! Thanks for posting. Your builds are always interesting, I like your 'rough and ready' style. Cool

    Nice simple, effective looking design...200# out of a self-bow prod is impressive. With a 15" powerstroke as well, it must really hurl a bolt!
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    hullutiedemies
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    Re: Crusader crossbow

    Post by hullutiedemies on Wed Apr 12, 2017 8:23 am

    I shot it a few times with pp string and 50 & 150 gram bolts. I did not try to measure the speed and the cheap plastic string was a bit slow, but the lighter bolt was going decent archery speed, looked like 60+ m/s , just eyeballing the trajectory. And with the heavier one it was still easy to hit target fom 20 paces.

    Linen string has been stretching a few days
    New string is less elastic. Brace height increaced slightly. And draw weight too.
    I do not have scales to test exact draw weight at full draw, but extrapolating the power curve fron 40-60kg range gives around 110 kg (240#).
    Wich I still can pull back. That gives an idea how heavy the real things could have been.

    The thing is that I am close to 50 years old and never practiced any sports.
    And there are 50-60 year old women who push over 100kg at bench rest even in regional level weight lifting competitions.
    So this crossbow is suitable for an old lady.

    A professional mercenary crossbowman could probably draw closer to 400#.


    Bastard string is still on. Some paper wrapping on the string to allow work out without wearing it out.
    This mud shield may not be historical, but I do not like to press the bridling directly onto wet grass.
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    Anatine Duo
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    Re: Crusader crossbow

    Post by Anatine Duo on Wed Apr 12, 2017 5:03 pm

    interesting concept

    Do the limb tips flex?

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