Primitive Archer

Main Discussion Area => Bows => Topic started by: DC on October 16, 2014, 05:15:54 pm

Title: Limb thickness
Post by: DC on October 16, 2014, 05:15:54 pm

I closing in on the tiller of an OS bow. I'm trying to use the Mass Principle system. As I was scraping the sides I realized that I could end up with one limb thicker and narrower and the other thinner and wider and they would still look the same from a tiller point of view. Would this have any effect on the bows feel or performance?

Title: Re: Limb thickness
Post by: Blaflair2 on October 16, 2014, 05:54:18 pm

None that I notice. I rough out the bow, and a that's all the measuring I do.

Title: Re: Limb thickness
Post by: DC on October 16, 2014, 06:10:17 pm

Didn't think so but I thought I would check :D

Title: Re: Limb thickness
Post by: bow101 on October 16, 2014, 06:28:46 pm

Yep making selfbows you pretty well have to wing it.  I'm making laminated bows so I end up with 7/16" on 1 1/2 width.  64-66 NTN i usually end up with the draw weight I want around 44-50lbs at 27".
My next one will be 3/8" 1 5/8| wide trying something a little different.

Title: Re: Limb thickness
Post by: bushboy on October 16, 2014, 06:32:54 pm

With small diameter trees the top end of the stave will have a higher crown. This is the beauty of a sap stave.the limbs don't have to look the same,just bend the same.

Title: Re: Limb thickness
Post by: mikekeswick on October 17, 2014, 03:36:34 am

Whilst they don't HAVE to be the same it's good practise to make them the same width. The ratio of width to thickness will determine how much the limb physically weighs at a given draw weight/length.
If the limbs weigh different amount you will get handshock when shooting as the thicker limb is going to rebound quicker than the thinner limb.