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    Big draw length crossbow

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    MRobin
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    Big draw length crossbow

    Post by MRobin on Sat Sep 01, 2012 3:31 pm

    Hi everyone,

    New here, I'm from France, and have a long-time passion for achery, bows and crossbows though I don't have a lot of equipment. Here's a crossbow I finished some weeks ago, quite heavy one, designed so it can shoot two bows at the same time like penobscot's bows. But for now it has only one, a 50 or 55 lbs plumtree bow with a specially big draw length (22", taken from the back of the bow) which makes it quite efficient.

    As an improvement I want to craft more powerful wooden bows, using yew preferably.
    Currently it shoots a 20 gram aluminium quarrel at 140 fps, with nice accuracy. I think I can double this with a stronger bow, and get even more if I add a second one.





    At full draw (bends too much in the middle) :



    I know this is not scrupulously medieval (dacron string, screws), but I do with what I've got, while trying to get it to look good enough. Will post more pics if you want.
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    kenh
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    Re: Big draw length crossbow

    Post by kenh on Sat Sep 01, 2012 6:06 pm

    Nice looking bow! Little things like Dacron don't matter...
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    Todd the archer
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    Re: Big draw length crossbow

    Post by Todd the archer on Sat Sep 01, 2012 6:09 pm

    Pretty cool, how long is the prod?

    No doubt long draws helps performance (look at what they are doing with modern crossbows) but generally old world crossbows went with short draw/heavy weight set ups. Some are as short as 5".

    Also what release/lock are you using on your crossbow?

    Todd

    MRobin
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    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.

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    Re: Big draw length crossbow

    Post by MRobin on Sun Sep 02, 2012 12:47 am

    The prod is 45" long notch to notch, with a pretty big initial deflex.
    As for the release system, it's very traditionnal, here's a picture from earlier stage :



    I then reduced the ends of the nut and trigger's shafts (Ø5mm to Ø4mm), so they fit into the reinforcement plates, and cannot escape.

    I will probably add a spring to the trigger, it often gets half engaged which is kinda dangerous because then a very little action on the trigger is enough to release.

    This crossbow was designed to hold heavy draw weights, so if I can lay a hand on a leaf spring I will give an attempt at "big weight AND length" haha. But for now it's not likely to exceed 100 or 150 pounds.

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