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

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Geezer
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    Whammo Powermaster crossbow--need new bow?

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    Post by Mr. Apol Thu Jun 02, 2011 10:24 am

    I picked up (for a song) a complete stock for a 1970s vintage Whammo Powermaster crossbow. It's in good shape, and it is complete except for the bow & string. That's just as well, as I read that the Consumer Product Safety people recalled the Powermaster back when because the aluminum bows were prone to snapping, with unpleasant results.

    So I have this nice stock in need of a bow. I measured the slot in the stock and it would take one of those Taiwanese fiberglass bows in the 150# range except the length of draw is longer. Using my existing crossbow as a model, it has a draw length of 9.25 inches, while the Powermaster draw length with the same bow would be 10.75. Does this sound unsafe, stretching the Taiwan bow an extra inch and a half? It doesn't feel like a good idea to me.

    What alternatives are there? I'm not looking for anything fancy or supremely powerful, just a decent bow to get the old Whammo back into action.

    If anyone is curious what the Powermaster looked like, there are often ones on sale on eBay.

    Paul

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    Post by Geezer Thu Jun 02, 2011 10:36 am

    Wham-o powermasters. My first crossbow was a Powermaster, and the first I built used a Powermaster prod.
    The last time I checked, you could buy steel replacement prods for Powermaster from Alchem Corp.
    Alternatively, you could cut back your Wham-O Powermaster stock to accept either a 28 inch steel prod from Alchem or Darkwood, or you could fit one of the Chinese fiberglass prods. IF YOU PUT A 28 INCH CHINESE PROD ON YOUR WHAM-O WITHOUT REDUCING THE DRAW-LENGTH IT WILL BREAK! You have been warned. Geezer
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    Post by 8fingers Thu Jun 02, 2011 9:25 pm

    Any way you could add tips like a siyah on middle eastern bows?
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    Post by Basilisk120 Thu Jun 02, 2011 10:36 pm

    I think if you added recurve tips like a Siyah it would only make the problem worse. Having recurve tips increase the stress in the bow part.
    Now adding straight non-bending limbs like a Holmeguaard or Molenbat (not sure on either spelling) could reduce the stress in the limb for a give draw length. Now how to do that on a fiberglass limb (I'm assuming your talking about the fiberglass limbs)? Not so sure. Sounds like more work than it might be worth.



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    Post by jake-owa Thu Jun 02, 2011 10:37 pm

    I say make a bow. Getcha an old axe handle and carve the sucker out.
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    Post by Bocephus Sat Jun 25, 2011 3:22 pm

    Geezer, I still have my old Powermaster from back in the days. I would love to get it shooting again,just for old times sake.I searched for Alchem Corp. , but all I could find were chemical companies. Do you have any specifics on the company? Thanks!
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    Post by Basilisk120 Sat Jun 25, 2011 3:31 pm

    I believe he is Refering to Alchem inc.http://www.alcheminc.com They have a variety of crossbow prods for sale http://www.alcheminc.com/crossbow.html

    If you're not sure what to get, ask them and I'm sure they can point you to the correct prod.



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    Post by Bocephus Sat Jun 25, 2011 3:53 pm

    Found 'em! Thanks.

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