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Crossbows - Everything about Building, Modding, and Using your Crossbow Gear

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2 posters

    Han Dynasty Chinese Crossbow

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    Fangbows
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    Post by Fangbows Fri Apr 22, 2022 9:48 pm



    200 B.C. Han dynasty crossbow reconstruction

    I am looking for anyone interested to help build a 400lb @20"-25" draw length bow for this, as this was the most common specs according to our research of the Han dynasty.

    My current reproduction is only a 100lb@28" fiberglass placeholder

    based on archeological evidence there are prods made of laminated planks of wood steamed into a M shape and then glued together and wrapped. The one we plan to make is a reflex deflex (wingull shape) with low brace height instead of a reflex reflex (Magyar shape). This would also allow the bow to be strung much longer similar to deflex bows.


    Such crossbow can theoretically be 3 times more powerful than a Mary Rose longbow, and we already have medieval horn crossbows tripling the kinetic joules of these longbows (by Andreas). 400 Joules would be very interesting to test against lamellar armor and siege thickness shields etc
    I already have a 290lb@26" longbow but its a D shape so I am using that one to make a song dynasty crossbow instead because we have very limited evidence of D shape for specifically Han dynasty
    hullutiedemies
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    Post by hullutiedemies Thu May 12, 2022 2:04 pm

    I have some experience with heavy weight wood bows.
    This one might be some use for laying out your prod:
    https://thearbalistguild.forumotion.com/t1564-crusader-crossbow
    My bow here takes ca. 200J potential energy.

    If you want to double that, the math is simple. Just double the amount of bending wood.

    A practical size M-profile bow can be made with about 40% longer bending limbs. These longer limbs can then be made 60% thicker while keeping the same power stroke.
    The bow could then store 110% more energy. So compared to above example that would be over 400J stored energy, 450-500# draw weight , 15" power stroke, 21" draw length measured from stirrup to lock. Which is about what you want.

    Power stroke is proportional to limb thickness reversed, so it is easy to adjust if desired- limbs then need to be wider in equal proportion to keep the same stored energy.

    But in any case it takes about 3 liters of bending wood to safely store 400J.

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    Post by Fangbows Tue Jun 07, 2022 8:26 pm

    Han Dynasty Chinese Crossbow  M-Weapons-2-4C-Aug03
    hullutiedemies wrote:I have some experience with heavy weight wood bows.
    This one might be some use for laying out your prod:
    https://thearbalistguild.forumotion.com/t1564-crusader-crossbow
    My bow here takes ca. 200J potential energy.

    If you want to double that, the math is simple. Just double the amount of bending wood.

    A practical size M-profile bow can be made with about 40% longer bending limbs. These longer limbs can then be made 60% thicker while keeping the same power stroke.
    The bow could then store 110% more energy. So compared to above example that would be over 400J stored energy, 450-500# draw weight , 15" power stroke, 21" draw length measured from stirrup to lock. Which is about what you want.

    Power stroke is proportional to limb thickness reversed, so it is easy to adjust if desired- limbs then need to be wider in equal proportion to keep the same stored energy.

    But in any case it takes about 3 liters of bending wood to safely store 400J.

    You seem to have a lot of experince with these.
    can you help me build a prod for this project? we dont even need 400j, 150j is fine. something like 400lb @ 15 inch powerstroke but the more important thing is with a slight M shape (gull-wing shape). it can be that shape already when unstrung for ease of stringing
    contact me fangbows@gmail.com
    hullutiedemies
    hullutiedemies
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    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?


    Posts : 191
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    Post by hullutiedemies Fri Jun 17, 2022 1:00 pm

    If you mean you want someone to build you that bow, then you will need to find someone who is confident in building laminated bows. I quit even trying those some 20 years ago.

    Fangbows wrote:
    150j is fine. something like 400lb @ 15 inch powerstroke

    That is over 300J
    150J would be around 180#/15"


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