The Arbalist Guild

Would you like to react to this message? Create an account in a few clicks or log in to continue.

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

Latest topics

» Ball shooting Crossbows worth the bother
by topfmine Wed Sep 15, 2021 3:24 pm

» Chu Ko Nu - repeating chinese crossbow
by Dark Factor Mon Sep 06, 2021 10:36 am

» Skew of tiller
by drawknife Fri Aug 27, 2021 9:18 am

» tiller desgin
by crusader Wed Aug 18, 2021 10:37 am

» Want to build modern target crossbow
by ora8i Fri Aug 13, 2021 1:20 pm

» starting a 1400's replica
by tghsmith Wed Aug 11, 2021 10:25 am

» New Medieval just about finished
by Dark Factor Mon Aug 02, 2021 6:41 am

» How do I tune this
by stuckinthemud1 Sun Jul 25, 2021 3:14 am

» Plans and materials for my first build
by c sitas Sat Jul 03, 2021 7:39 am

» Bolt rest
by stuckinthemud1 Mon Jun 14, 2021 3:24 pm

» Collotiere a Charavines crossbow
by stuckinthemud1 Sun Jun 06, 2021 2:25 pm

» ash lath and pin-lock crossbow
by stuckinthemud1 Wed Jun 02, 2021 7:56 am

» Late medieval tournament distances?
by stuckinthemud1 Thu Apr 15, 2021 8:20 am

» Cutting delrin straight by hand?
by kenh Thu Apr 01, 2021 8:24 pm

» Other forums like this one?
by stuckinthemud1 Tue Mar 30, 2021 9:23 am

» new find in china, terra cotta warrior site
by tghsmith Thu Mar 25, 2021 4:42 am

» Crossbow Books
by Andy. Sun Mar 14, 2021 3:46 pm

» 95lb ancient crossbow shot faster than 960lb medieval
by Fangbows Fri Mar 12, 2021 11:36 pm

» best type of horn to use..
by kenh Tue Mar 09, 2021 3:16 pm

» re-introduction
by tghsmith Sun Mar 07, 2021 3:15 pm

» 4 fletch question
by 8fingers Fri Feb 05, 2021 3:14 am

» fix bolts
by MPDVM Tue Feb 02, 2021 7:40 pm

» Reverse draw compound bow build
by c sitas Tue Feb 02, 2021 7:20 pm

» New Build for 2020
by Gnome Wed Jan 27, 2021 6:19 am

» Spanning bench ideas
by stuckinthemud1 Fri Jan 08, 2021 1:07 pm


5 posters

    Fiberglass prod draw length

    woodsmith
    woodsmith
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 16
    Join date : 2013-11-07
    Age : 66
    Location : Kitchener, ON, Canada

    Fiberglass prod draw length Empty Fiberglass prod draw length

    Post by woodsmith Sun Dec 29, 2013 11:58 am

    Does anyone know the draw lengths for the Taiwanese fiberglass prods, the 80lb and the 150lb ?
    I'm starting a build based on a PVC prod but would like to change it out later for a stronger prod.
    Thanks
    Geezer
    Geezer
    Master Crossbowyer
    Master Crossbowyer

    Posts : 1194
    Join date : 2010-01-12
    Age : 73
    Location : Austin, Texas, USA

    Fiberglass prod draw length Empty Re: Fiberglass prod draw length

    Post by Geezer Sun Dec 29, 2013 5:07 pm

    If we're on the same page, the Chinese 150 lb. fiberglass prods (often closer to 125) are essentially knock-offs of the old Barnett Panther and later "San Marino' crossbows.  approx 28 inches from end to end.  They'll tolerate @ 8 inches of draw from 3.5 in. brace... maybe 9 inches, but I never went for more than 8.  Does anybody else have more info?  Geezer.
    avatar
    phuphuphnik
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?

    Posts : 151
    Join date : 2013-12-02
    Location : The wastes West of Chicago

    Fiberglass prod draw length Empty Re: Fiberglass prod draw length

    Post by phuphuphnik Sun Dec 29, 2013 5:12 pm

    I don't know about the 150s but I just bought 3 of the 80s. I'm measuring 6" with a 17" string. Thae might go further, but I can't pull it back any more. I got them from the crossbow store's ebay page for just shy of $10 each.  I'll gladly let you buy one off of me, as they won't do for my stonebow project. All that said, I'll be getting one of the 150# or the 120# and I'll let you know what that draw is in a week. I'm hoping they are around 11"
    cheers!
    chriso

    EDIT Geezer beat me to it with the 150s. Glad I didn't order one yet. Might need to redesign the stock...
    woodsmith
    woodsmith
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 16
    Join date : 2013-11-07
    Age : 66
    Location : Kitchener, ON, Canada

    Fiberglass prod draw length Empty Re: Fiberglass prod draw length

    Post by woodsmith Mon Dec 30, 2013 5:11 pm

    Thanks Geezer and Chriso, I'm glad I asked at this stage. The PVC prod I made is drawing 11" on top of a 4" brace. I have some decisions to make before I go any further.
    avatar
    jeep
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 379
    Join date : 2011-04-07

    Fiberglass prod draw length Empty Re: Fiberglass prod draw length

    Post by jeep Tue Dec 31, 2013 3:31 am

    About the Taiwanese fibreglass bow 150#. (Referring geezer measurements: brass 8,89cm draw20,32cm) I am a regular user of those for various experiences.
    For my first bullet crossbow (Midleton inspiration)
    I used split limb 150# fibreglass
    brass 10cm  draw 22cm
    For the slur-bow (fibreglass)
    brass 10cm  draw19cm
    XIX th cent hunting 2x 150 fibreglass
    brasse 10cm  draw 23,5 cm

    For the bullet crossbow Richard Midleton point out that he don't succeed to use fibreglass limb because of the poor torsion resistance  (bullet need extra angle). This is the reason why I used split limb (centre shot, no angle)and there he work pretty well .
    I most of the time use the fibreglass over draw. I found a lot of tolerance but by precaution I all-way wrap them with  tape string or leaser. When is going to give up it produce crack before.
    my bullet crossbow
    Fiberglass prod draw length Bullet14
    avatar
    jeep
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 379
    Join date : 2011-04-07

    Fiberglass prod draw length Empty Re: Fiberglass prod draw length

    Post by jeep Tue Dec 31, 2013 3:31 am

    Fiberglass prod draw length Bullet15
    avatar
    jeep
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 379
    Join date : 2011-04-07

    Fiberglass prod draw length Empty Re: Fiberglass prod draw length

    Post by jeep Tue Dec 31, 2013 3:45 am

    This kind of bullet crossbow with 150# bow is not a toy!!! it is incredibly powerful and potentially dangerous if not well cantered and balanced. This is a weapon....
    Some time the bow brake. Look the  last development  post  XIX th cent crossbow
    Gnome
    Gnome
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 447
    Join date : 2011-10-16
    Age : 57
    Location : North Georgia

    Fiberglass prod draw length Empty Re: Fiberglass prod draw length

    Post by Gnome Tue Dec 31, 2013 11:42 am

    For the full size 150lb prod, you should be able to draw 10 inches from a 3.5 inch brace height with no problem. I have one build that draws 12 inches from the same brace height. Now that I've explored the limits of the prod I can tell you I probably won't ever do that again. Too scary, even with a very strudy wrapping around it. I draw it with a cocking rope, and even then, the last inch or two I can feel a lot more resistance. So I would say 10 inches is a safe maximum draw for the designed brace height of 3.5".
    I'd also reccomend testing each individual prod- they may look identical, but there are definitely some variances in their construction. I had one crack on me while stringing it on my press, it wasn't flexed more than a few inches.
    Gnome

    Sponsored content

    Fiberglass prod draw length Empty Re: Fiberglass prod draw length

    Post by Sponsored content


      Current date/time is Mon Sep 20, 2021 2:40 pm