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    Questions about steel prod specs

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    Daniel Levesque
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

    Posts : 56
    Join date : 2016-12-06
    Location : Quebec, Canada

    Questions about steel prod specs

    Post by Daniel Levesque on Fri Jul 07, 2017 7:58 am

    Hello all !

    I've completed my third crossbow in 9 months (in began the first one back in october 2016... It's pretty addictive). Now with the fourth one, I wanna change from wood prods. I was able to put a hand on a leafspring blade from a pickup. It's 40 inches long and 3/8 inch thick, about 2 inches wide or so. I'd like to make a crossbow in the 300 - 350 pounds of draw weight (with a goat's foot lever of course). What would you guys recommend as the length of prod notch to notch vs brace height and powerstroke ?
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    JacobL
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.

    Posts : 62
    Join date : 2017-07-30
    Age : 17
    Location : Manitoba, Canada

    Re: Questions about steel prod specs

    Post by JacobL on Mon Jul 31, 2017 8:25 pm

    Im no expert but I believe you could do better off with a lighter draw weight. If you were going for a medieval build I'd say something like a 6'' draw length or maybe 8''. Nothing too long as you do not want to overstress the prod in any way. The bow could maybe be between 1 1/5 feet to 2 feet. Taper it but don't overdo it. And safety is IMPORTANT when it comes to steel prods (believe me I've seen alot of failures), so wrap the prod with something, be it camoflauge duct tape, hemp rope, or even sewn leather. Steel is an excellent material in that it flexes far more than wood can, but if it's so thick and with such a heavy draw, I wouldn't flex it much. I don't take steel prods over 150 pounds due to just pure fear after an accident. Just my thoughts though, make sure to do as much research as you can.

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