Very cool stuff. I am really surprised to see a full 42 fps from the 30" draw to the 45" draw. I would've never guessed it was that much difference.
The 3/8" steel was just too much mass for the 2040 tubes. I bet they are better with lighter ammo and would make 1/4" fly pretty well. And BB's would likely come out at or really close to the retraction speed of the tube, especially with a good draw length. Maybe even up around 300 fps. For tube enthusiasts, I get doubling or pseudotapering the 2040 would also get it doing well with 3/8".Wow a 30 inch draw is only shooting 150 fps for the 3/8 steel? That seems really slow. What about the videos I've seen of people shooting well over 380 fps?? Must be bb's or something?
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The chrony is both sobering and informative all around. I have been trying to make bows and also had visions of lofty speeds. Not sure what poundage your bow is but a 750 grain arrow is really heavy, but will likely penetrate anything it hits.Lol, I remember the one (and likely only) time I chronied my longbow. I had these visions of 250 fps and was deflated when I barely got 150! I was lofting 750 grain hickory shafted arrows though. At least they looked fast.
A perfect short summary to my many many paragraphs. And also why I am looking forward to taking up butterfly someday when I have enough time to learn how to do it well and make it hit where I am aiming. Until then, I'll be happy that current elastics are plenty snappy to be useful with shorter draws.Kokopelli.. Nice job! All those facts and figures make my head swim. But one fact hits home, longer is better, assuming you can put it where you are aiming. Otherwise it's a moot point.
I am going to guess the difference is the mass of the ammo tested. I think I would have seen less of a difference testing light ammo like BB's and and even bigger difference if I tested heavier ammo.Kawkan had an old post from years ago where he cronied long bands, then bands exactly half the length. The result if remember was almost exactly half the fps. Your result is a bit different as the 4 inch bands are more then half the fps of the 8 inch bands.not sure what it means