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

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» Han Dynasty Chinese Crossbow
by hullutiedemies Fri Jun 17, 2022 1:00 pm

» Drawing of Crossbow
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» "How To Make Everything": Early Crossbow
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» Roller nut details
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» 330#/7" wood bow
by Anatine Duo Tue Mar 29, 2022 11:08 am

» starting a 1400's replica
by stuckinthemud1 Thu Feb 24, 2022 1:26 pm

» 18th century German crossbow reproduction
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» Josef alm in English
by stuckinthemud1 Fri Jan 14, 2022 3:07 pm

» Medieval crossbow finished
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» Trigger mechanisms
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» Finish wooden stock
by stuckinthemud1 Sat Dec 25, 2021 9:06 am

» finish prod binding
by kenh Tue Nov 30, 2021 5:26 am

» What bolts do you use?
by hullutiedemies Mon Nov 22, 2021 9:43 am


3 posters

    330#/7" wood bow

    hullutiedemies
    hullutiedemies
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    Post by hullutiedemies Sat Mar 19, 2022 12:17 pm

    Here is something that might be of interest.
    This is ment as documentation for reference.
    330#/7" wood bow J_tuomi330lbs
    A bird-cherry (prunus padus) prod.
    String: 75 cm
    Length measured along the bow back: 86 cm
    Width x thickness: 40mm x 38 mm at middle,
    25mm x 23mm at tips.
    Power stroke: 183 mm
    Brace height 190 mm - measured fom belly of the bow
    Draw weight after first test shooting : ca 150 kg
    Stave is a sapling with natural deflex close to brace height.

    The prod is seen here mounted on a temporary tiller with even more temporary whippe contraption.
    The string has required some adjusting , as can be seen from asymmetric serving and loops.

    I might built a nicer tiller for this if the bow survives some more test use.

    But mainly this is a feasibility study and practice run. I have an other stave waiting that should make about 800#/7" bow and a 5"x3" rowan log to try a proper medieval style 2000 lbs military crossbow...

    ... - maybe, one day.
    I started this current one last summer and it took a while of re-tillering , re-stringing and breaking in to get it hold the string tension after spanning.

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    stuckinthemud1
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    Post by stuckinthemud1 Sun Mar 20, 2022 3:22 pm

    Really interesting project, I am also interested in wooden bows. I have only built a couple but I found my bows started to struggle with set when draw length went much above 1/4 of bow length. Is your length of power stroke draw length plus brace height?  150kg is much more than I have attempted yet, I’m very impressed,


    Last edited by stuckinthemud1 on Sun Mar 20, 2022 3:56 pm; edited 1 time in total
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    stuckinthemud1
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    Post by stuckinthemud1 Sun Mar 20, 2022 3:40 pm

    Also, bird cherry is an unusual choice, it has a nasty reputation for going “bang” but being fabulous if you can get a piece to work. The Rowan should be amazing. I guess you don’t have access to yew or wych elm?
    Anatine Duo
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    Post by Anatine Duo Tue Mar 29, 2022 11:08 am

    Cool example of extreme deflex.

    Thank you

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