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short draw chrono results
bradsmith2010:
a few threads ago some expressed interest in short draw performance,, I took some notes making bows a while back,,and found sometimes the shorter draw shoots harder than some would think so am looking at my notes to post a few results,,,I did find that shooting the bow through a chrono even at very short draws gave me a good indication of what a bow might do at desired draw,,
my first example is from 2016,, its an osage bow,, stave bout 10 years old,, length 69 inches,, intended draw for a friend(jeffer) 29 or 29 1/2,,, I posted this bow but cant remember the name of the thread,,it says in my notes the stave was holding 3 to 4 inches of reflex,,
ok first test the bow was 44#@20 inches,,,148fps with 480 grain arrow,,,
then as I tillered it out,,49#@22 inches 156 fps with 486 grain arrow,, you can see the bow shooting harder with increased power stroke,, ok at 24 inches of draw,,53#@ 24 inches and 486 grain arrow 167 fps,,,
ok even though the bow is really to long for a short draw,, it is showing that it could shoot a hunting weight arrow very well,,at this point I put a rawhide back on the bow,, and it still performed very well out to the 29 inch draw,,but could have made a nice shooting bow from 24 inches out,,, I have found that alot of bows in the tillering process start to shoot really well once to 24 or 25 inches of draw,, and at that draw are under very little strain.. or not taking much set,,, ok thats the first example I have some more notes of some sinew bows,, that I will post later,, if anyone can tell me how to find that post I would like to see it,,
I wanted to add, that alot of the time we are disappointed in the results,, its not because of the process or skill,, but wood can vary sometimes and its about the material,, or string,, or moisture content or other factors,, not the process or skill,, this stave is a great example,, the natural reflex really helped ,,,Im not sure if heated in reflex is as effective,, anyway,, just saying for new guys, dont be so hard on yourself,, guys getting consistant great results have worked decades,,,to achieve that consistency,, and know how to pick wood that will do it,, :)
PaSteve:
Interesting subject Brad. My draw is about 25 1/2" with natural bows so I'm very interested in your findings. I'll agree that a particular stave can make the difference. The Osage bow I usually hunt with definitely has an velocity edge over other Osage bows I've built of similar design.
bradsmith2010:
I think it is so interesting,, I have a black locust bow that shoots about 150 at 20 inches of draw,, its really short all the wood I had,, holds only bout 1 inch reflex with thin layer of sinew,,,it would kill a deer,, if I could hit one with it,, Ill post a photo later,,
Badger:
That was a very interesting post Brad and mirrors what I have observed. My draw is 26" I am comfortable at 25". That's where I will start tillering them to.
George Tsoukalas:
Brad, very nice post. Jawge
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