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Main Boards => The Bowyer's Bench => Topic started by: BenBow on March 12, 2015, 12:10:00 AM

Title: Force draw program
Post by: BenBow on March 12, 2015, 12:10:00 AM

I posted some images of force draw curves for bows I've built or worked on and people have been asking for a copy so you can download version .1 here
 
 http://www-personal.umich.edu/~cdsnyder/drawcurve/index.html#Download

Title: Re: Force draw program
Post by: JamesV on March 12, 2015, 04:02:00 PM

Ben............

I was charting the force draw curve on a BBI longbow 75# @ 28 and the bow exploded at full draw. I was told that I should have never drawn a wood bow mechanically and held it at full draw. I disagree, better that it broke before someone was shooting it and was seriously hurt.

What would be your thinking on this subject???

James

Title: Re: Force draw program
Post by: BenBow on March 12, 2015, 04:49:00 PM

James I don't work with all wood bows yet so I can't give you an answer but I'd guess it had other issues otherwise you couldn't hold at full draw without fear of the bow breaking.

Title: Re: Force draw program
Post by: halfseminole on March 13, 2015, 09:11:00 PM

That bow was gonna give, but from my understanding unless it's glass or sinew/wood/horn don't hold it for more than a few seconds.  Others who know more than me will probably correct me.