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short draw chrono results
Chumash:
Real Tested
55l bs/ 26 Osage recurve with bamboo backing (53" bow length) with a 8,5 gpp arrow 175fps.
45 lbs / 27 deflex static recurve Ironwood with ash backing by MSL (60" length) with a 10gpp arrow: 180fps
55lbs / 27 Osage recurve sinew backing (56" length) with a 9gpp arow: 175fps
55lbs / 26 Osage selfbow by K. Vögele (58" length) with a 9 gpp arrow 183 fps
45lbs / 27 Hickory selfbow (59" length) with a 10gpp arrow 170fps
The last two years I have shoot the Hickory selfbow and I enjoy to hit the target more than to shoot fast in the nirvana....
and with a good fitted arrow I hit the target with all bows.....
bradsmith2010:
thank you Chumash,, for that great info,, I appreciate the effort to post for us,,
ok here is my second example,, the bow is not that fast,, but I did start shooting at 20 inches of draw and have some notes on it,, it was from a belly cut osage that was a little ragged, ,and I was not sure it would even make a bow,, it was about 1 inch wide,, I put rawhide on it because some of the edges looked bad,, but didnt have enough wood to rasp them smooth,, ok
the bow was 56 inches knock to knock with rawhide back,, in my experience the rawhide didnt really slow the bows down, I think the string you use has more effect on that than a good thin backing,,in this case I dont think this peace of wood would have made a bow without it,,
54#@ 20 inches and would shoot a 500 grain arrow 144 fps,, this is with b50 string,, never tested it with fast flight that I can see
59#@23 inches 151 fps with 500 grain arrow
60#@25 inches 170 fps with 500 grain arrow,,
sometimes I got lazy and didnt bother to make an arrow that was 10 gpp,, and back in the day, most people shot a 500 grain arrow cause that was what Tim was shooting in the design chapter,,
but a hunting weight arrow going 170 fps is really deadly,,i still have this bow I made it in 2015,, it has taken some set and I think its probably lost some speed,,but shoots well,, the width of the bow just wouldnt handle the 60#,, just not enough wood there,,thats how we learn,,
mmattockx:
--- Quote from: bradsmith2010 on December 11, 2022, 11:48:16 am --- 59#@23 inches 151 fps with 500 grain arrow
60#@25 inches 170 fps with 500 grain arrow,,
--- End quote ---
This really demonstrates the effect that a longer draw has. Only a 1# weight increase, but almost 20fps more speed with the same arrow. Do you have any pictures of this bow?
Mark
bradsmith2010:
Im looking at my notes,, it does seem like I made a mistake,, somewhere, ,but the the final weight is 60# at 25,, maybe I overdrew the bow on the last measurement,, not sure, but thats what I wrote down,, maybe I had swithed to a fast flight on the last shot something,, I have in my notes that I re tested the bow again on june 26 with 478 grain arrow(first test was november,, so several months later) and it shot 170fps,, so I have a feeling it might be a combination of how far I pulled the bow,, and accurate weight etc,, shooter error,, (-S
yes I have a picture of the bow,, let me find it
Ok I have a feeling that when I pulled it to 25 inches,, it had not been shot much at that draw,, so was a pretty fresh reading,, and probably settled in to a less dramatic increase,, I dont have that in my notes,, but have a feeling that accounts for some of the increase,,Maybe my releasse was better that day,,
bradsmith2010:
bow pics
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