Primitive Archer

Main Discussion Area => Bows => Topic started by: NOMADIC PIRATE on October 23, 2015, 06:46:28 pm

Title: Shortening limbs formula ?
Post by: NOMADIC PIRATE on October 23, 2015, 06:46:28 pm

Been out of this for sometime and forgot several things  :'( :'(

I wanna shorten the limbs on my new Osage flatbow to gain some weight, ...what is the weight gain per inch again ?


Thanks

Title: Re: Shortening limbs formula ?
Post by: JonW on October 23, 2015, 07:10:35 pm

I think typically 5#/ inch

Title: Re: Shortening limbs formula ?
Post by: NOMADIC PIRATE on October 23, 2015, 07:46:58 pm

One inch per limb or one inch total ?

Title: Re: Shortening limbs formula ?
Post by: bubby on October 23, 2015, 10:50:56 pm

Per limb

Title: Re: Shortening limbs formula ?
Post by: Del the cat on October 24, 2015, 04:06:54 am

You can "try before you buy" by binding the string tight down onto the limb say 1" down from the nock and seeing what it weighs!
Del

Title: Re: Shortening limbs formula ?
Post by: Bowyer Wannabe on October 24, 2015, 07:03:59 am

Here is the exact formula, presented by Mike form Boarrior Bows.
I have tested the formula on one of my hazel stave bows and it was spot on.

https://www.youtube.com/watch?v=4unczZmmcLo

Title: Re: Shortening limbs formula ?
Post by: Aries on October 24, 2015, 09:24:26 am

Del I use your method  ;D

Title: Re: Shortening limbs formula ?
Post by: Springbuck on October 24, 2015, 11:15:44 am

  I second Del's method, which can also be used to make small adjustments on tiller.

  The amount the weight changes will vary with bow style, length and geometry, too.  Taking two inches total off a 50" bow is proportionally a lot more than taking two off a 72" bow, so expect a bigger jump in draw weight, with accompanying increased set stacking, and/or breakage.