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    Reverse draw "compound" build

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    Turnigy
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    Reverse draw "compound" build

    Post by Turnigy on Wed Apr 19, 2017 6:25 am

    Hello. 
    This is my first reverse crossbow build. Spring steel limbs, 20" power stroke and 90 lbs draw weight. It is heavy, arround 12 lbs, but it's because of thick steel I used for limbs mounting and trigger, and also limbs are really heavy. I used round pulleys instead of cams, so it isn't real compound, I just wanted to increase the power stroke. I am using single piece of paracord as a string, but I already ordered some dyneema fishing lines to make a proper string. It shoots much better than my 100 lbs medieval crossbow, but lighter arrows seems pretty slow to me. I think that's because of weight on the tips of limbs. I'm gonna order some 500 grain carbon arrows with 125 grain tips, instead of light fletched dowels i'm using right now. I hope it will increase the energy of arrows.

    I would like to show you some pictures, but "New members are not allowed to post external links or emails for 7 daysRolling Eyes So I will add links to photos after 7 days.

    c sitas
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    Re: Reverse draw "compound" build

    Post by c sitas on Wed Apr 19, 2017 9:07 am

    hello Turnigy; Good to have you here. On the subject of your arrows. You'll find the weight is of small consequence. The impact will change but, very little at reasonable  shot lengths, "20 to 30" yards.Then heavier arrow will quiet the prod,also will carry more energy to the target.

    Turnigy
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    Re: Reverse draw "compound" build

    Post by Turnigy on Sat May 13, 2017 2:25 am

    There are some photos from building:

    https://ibb.co/fFfnak - that's what I started with - nylon pulleys and leaf spring
    https://ibb.co/g6NdgQ - limbs cleaned and slightly tapered
    https://ibb.co/dOrSak
    https://ibb.co/i3ojMQ - limbs attached to rail
    https://ibb.co/ehJZMQ - trigger mechanism
    https://ibb.co/noFW1Q - unstrung crossbow
    https://ibb.co/gGYjMQ 
    https://ibb.co/iNP8gQ - cocked crossbow (notice uneven deflection of limbs) also sorry for quality of pictures

    New arrows arrived yesterday, they shoot much better than fletched dowels. I can't tell anything about grouping, because sight still didn't arrive, but crossbow seems pretty accurate. I'll also need to taper right limb slightly more, it deflects little bit less than left limb. Also, I'll need some kind of string-stop, because it keeps falling down the rail after shot

    c sitas
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    Re: Reverse draw "compound" build

    Post by c sitas on Sat May 13, 2017 10:43 am

    On your limb balance , you could just slightly remove some of the bolt tension on the limb.It's terrible hard to make everything just perfect.How are your cables rigged? How much do estimate your pulling on the bow? Looks well put together.Be careful you don't end up cutting your string because of the over run. Keep up the good work.
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    FrenckBrambo
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    all the same picture..

    Post by FrenckBrambo on Tue May 23, 2017 6:18 am

    Hallo Turnigy, a I am curious about your pictures, but all the link give the same picture, that of the test-limbs standing against the door opening..

    Turnigy
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    Re: Reverse draw "compound" build

    Post by Turnigy on Fri Jun 02, 2017 1:20 pm

    Pictures work good for me, if you have problems, try to copy the URL and paste it directly to the search bar.

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    Re: Reverse draw "compound" build

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