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

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» Troubleshooting
by Cscott Tue Nov 15, 2022 11:55 am

» Fiberglass H-bows
by c sitas Sat Nov 12, 2022 8:44 am

» Bad Antler
by drawknife Sat Nov 12, 2022 3:48 am

» Anyone make their own bolts?
by Juniper Mon Oct 17, 2022 8:20 am

» Colletiere a Charavines crossbow
by stuckinthemud1 Sun Oct 16, 2022 3:39 pm

» Josef alm in English
by Juniper Sat Oct 15, 2022 4:22 am

» Qin/Han lock drawings
by kenh Fri Sep 23, 2022 8:16 pm

» stirrup dimensions?
by stuckinthemud1 Thu Sep 01, 2022 1:49 pm

» Skane/Lillohus lockbow information needed
by stuckinthemud1 Sun Aug 14, 2022 6:23 am

» need help contacting le musee Dauphinois Grenoble
by stuckinthemud1 Sat Aug 13, 2022 3:22 pm

» Low Draw Weight Build
by stuckinthemud1 Fri Aug 12, 2022 3:09 pm

» Trigger testing Rig/Jig?
by ora8i Fri Aug 12, 2022 1:13 pm

» best type of horn to use..
by stuckinthemud1 Fri Jun 24, 2022 6:13 am

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

» Drawing of Crossbow
by stuckinthemud1 Fri Jun 03, 2022 3:01 am

» "How To Make Everything": Early Crossbow
by stuckinthemud1 Thu Jun 02, 2022 3:41 am

» Black inlay
by stuckinthemud1 Fri May 13, 2022 3:18 pm

» Roller nut details
by drawknife Thu Apr 21, 2022 2:44 pm

» 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
by Fangbows Sun Feb 20, 2022 7:15 am

» replacement for baleen?
by tghsmith Mon Jan 17, 2022 9:30 am

» Medieval crossbow finished
by stuckinthemud1 Wed Jan 12, 2022 3:05 pm

» Trigger mechanisms
by stuckinthemud1 Mon Jan 03, 2022 10:23 am

» Finish wooden stock
by stuckinthemud1 Sat Dec 25, 2021 9:06 am


4 posters

    Fiberglass H-bows

    hullutiedemies
    hullutiedemies
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    Fiberglass H-bows Empty Fiberglass H-bows

    Post by hullutiedemies Tue Nov 08, 2022 11:58 am

    Just for the record posting.
    My ISP will soon be cancelling their consumer website service,
    so I decided to document this while I still can upload pictures the easy way.


    This is a modernized version of a "primitive" design from several years ago
    see the wooden version here:
    https://thearbalistguild.forumotion.com/t689-paleo-legal-compound

    I found an inexpensive source for suitable fiberglass rod , and wanted to see how this system would work with it.
    The bows here are made of 8x11mm flattened hexagonal profile.
    80cm piece of this can take 60 Joule load, so very small and powerful bows can be made this way.

    First prototype was done couple years ago
    - or maybe four I've been a bit lazy at documenting my work.


    Fiberglass H-bows J_H60_1
    Fiberglass H-bows J_H60_2
    Fiberglass H-bows J_H60_3

    27 kg 19cm power stroke. Light enough to be cocked without stirrup.
    The extra long handle allows elbow room when the butt is braced against hip for spanning.
    It also doubles as mount for iron sight with reasonable radius.


    Nobody has been willing to sell me a chrony, but at close range this nails a soup tin to a pine board with a blunt 5mm thick 800 milligram bolt. And it shoots flat enough to hit one at 70 meters.
    With 25J potential energy and couple hundred gram mass this is like a high power air rifle with 1/10 the weight and 1/100 the cost.


    And the somewhat over engineered second version

    Peak weight 40kg, powerstroke 178mm (90#7")
    with noticeable let-off at end of draw.
    Clap lock, apple tree branch frame.
    This can still be spanned without stirrup,
    which is what this butt-stock is for. It is not a shoulder stock.
    Fiberglass H-bows J_H90lbs
    Fiberglass H-bows J_H_90lbs2
    The wire is holding the hold-open spring for the lock clap.
    It coud look nicer, but I keep losing interest in my projects once I get them to sort of work.
    Fiberglass H-bows J_H_90lbs4



    Here is the new "full power" version 140#/12", still in testing.
    Fiberglass H-bows J_lasiH
    The bows and trigger have been recycled from earlier projects.
    I've been intentionally hitting targets upto 178m distances with 20 gram bolts.

    This works too well, so it needs to be rebuilt better.
    - someday - maybe

    hullutiedemies
    hullutiedemies
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    Did you see my tool collection?


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    Post by hullutiedemies Tue Nov 08, 2022 12:08 pm

    hullutiedemies wrote:Just for the record posting.
    see the wooden version here:
    https://thearbalistguild.forumotion.com/t689-paleo-legal-compound

    Some images were missing , but here is an other one
    https://thearbalistguild.forumotion.com/t1212-tactical-polymer-pistol
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    stuckinthemud1
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    Post by stuckinthemud1 Fri Nov 11, 2022 12:32 pm

    Thanks for posting, absolutely fascinating.  Looking forward to you posting some more
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    kenh
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    Post by kenh Sat Nov 12, 2022 6:14 am

    Loved the original paleo-legal compound design, but never got around to building my own.  I reaaly like your hi-tech improvements.  I've got a length of fiberglass chainlink fence tension bar, like i used on my loose-lam bow a few years ago.  Just might have to give it a try!    Thanks for the inspiration.
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    stuckinthemud1
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    Post by stuckinthemud1 Sat Nov 12, 2022 8:36 am

    The Chinese used to strap two archery bows together like this when they ran out of crossbow laths and needed extra crossbows in a hurry

    c sitas likes this post

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    c sitas
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    Post by c sitas Sat Nov 12, 2022 8:44 am

    great job on the bow.  I am a great fan of the bundle bow. The power is almost unlimited.

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