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    Fixing a bad delflex

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    Daniel Levesque
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    Fixing a bad delflex

    Post by Daniel Levesque on Tue Feb 21, 2017 11:20 am

    Hello everyone,

    I just sinewed an hickory prod a couple of weeks ago and foundd out my deflex wasn't so good at the end. It's not quite even and maybe not pronounced enough. Unless I'm mistaken here, I think you can immerse a wooden prod in water to get the sinew back right ?

    I'd really like to remove the sinew, work the deflex again by re-steaming and bending it and re-apply the sinew on.

    Is that even possible or do you have any better suggestions ?
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    hullutiedemies
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    Re: Fixing a bad delflex

    Post by hullutiedemies on Thu Feb 23, 2017 2:32 am

    It is supposed to do that.
    Sinew shrinks when it dries, and pulls the bow to reflex.

    The more deflexed limb has stiffer wood or thinner sinew.
    Just test it with long string on tillering stick and scrape the belly from stiffer side until the limbs bends evenly.
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    OrienM
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    Re: Fixing a bad delflex

    Post by OrienM on Thu Feb 23, 2017 7:58 am

    Did the prod change shape (lose deflex) after sinewing? Sinew does shrink as it dries, and can pull the limbs forward in the process. This happens mostly with lighter-weight, more flexible prods...very heavy cores don't tend to move, in my experience.

    If the shape was off before the sinew was applied, you can remove the sinew and re-bend. The method I've used is to keep the prod under water for about 12 hours, then peel off the softened sinew. I've never done this to a non-broken prod, but it should be possible to re-use the wooden core as well as the sinew...dry it out slowly and carefully afterwards, so it won't crack.
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    Daniel Levesque
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    Re: Fixing a bad delflex

    Post by Daniel Levesque on Thu Feb 23, 2017 9:52 am

    Thank you both !

    Actually, I'm not a 100 % sure my prod was bent correctly and evenly from the start so I'll put it in water, bend it again and re-apply the sinew. I'll try to go for a greater deflez too. Thanks again guys ! Very Happy
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    Re: Fixing a bad delflex

    Post by Daniel Levesque on Fri Mar 31, 2017 11:40 am

    Hello everyone, I just finished my first build, I'll post some photos soon but so far, I've shot one bolt with it (didn't went through the 30 shots "safety" yet) and, well... let's say I wouldn't like to be in it's path. This Xbow packs quite a punch for sure !!
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    Re: Fixing a bad delflex

    Post by OrienM on Sat Apr 01, 2017 7:54 am

    Awesome! Can't wait to see some pics. How did the process of reworking the prod go for you?
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    Daniel Levesque
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    Re: Fixing a bad delflex

    Post by Daniel Levesque on Mon Apr 03, 2017 10:36 am

    Went pretty well in fact, I did what you told me. For the sinew, I had to put it in water 6-8 hours, remove what I could and repeat the process a couple of time to remove all of it. I put the prod in my steambox again, clamped it on the form, let it dry and I re-applied the sinew. It comes out pretty strong but flexible. I would guess between 150 - 200 lbs. I can pull back the string by hand but it's not easy.
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    Re: Fixing a bad delflex

    Post by kenh on Mon Apr 03, 2017 2:57 pm

    Yu should have let that sinew dry, with the prod unstrung, for at least a couple months, before stringing the prod and using it.  That's how folks who replicate wood/horn/sinew horsebows work.   
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    Daniel Levesque
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    Re: Fixing a bad delflex

    Post by Daniel Levesque on Tue Apr 04, 2017 7:33 am

    Mmm... maybe I chose the wrong words sorry (english is not my main language). I did let the sinew dry on the unstrung prod for a whole month. I guess it's still better to unstring the prod after each shooting session right ?
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    Re: Fixing a bad delflex

    Post by OrienM on Tue Apr 04, 2017 8:26 am

    Glad to hear the re-work went so well! Very Happy

    While some bowyers do let sinew dry and cure for a year, I tend to leave it for only a month or so. I live in a desert, which probably speeds the drying process up quite a bit.

    Definitely do unstring the prod when not in use. Any wood bow left strung will take a set eventually, and lose power.
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    Daniel Levesque
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    Re: Fixing a bad delflex

    Post by Daniel Levesque on Tue Apr 04, 2017 11:13 am

    Nice ! seems like I'm doing the right thing then ! Very Happy

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