Main Discussion Area > Flight Bows
Virtual Mass revisited
Badger:
--- Quote from: DC on September 28, 2020, 07:11:05 pm ---I gathered some arrows 300,400,500,550 and 560 grains and shot them through the chrono. Then I graphed the results and got a pretty much straight line except for a little jog with the 550 that I can't explain yet. Then I made a heavy Ocean Spray arrow that is 650 grains. I marked on the graph where I thought it would end up and it was right on. Speeds went from 175 to 240 fps. Does this straight line tell me anything?
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if your graph was based on Virtual mass the predictability would mean little hysteresis. What was your graph based on? You got 240 from a 300 grain arrow? Excellent! I think a clean shot from a 300 grain arrow going 240 fps would get you over 400 yards.
DC:
My graph was just weight vs speed.
Badger:
Using virtual mass I came up with these. 400 grains 215 fps 500 grains 195 fps 550 grains 188 fps. How close is this to what you have. I had to estimate your stored energy.
DC:
400 was 215, 500 grains was 200, 550 was 198. I did a 560 and it was 191. I'm thinking that if there was a lot of hysteresis the line would have been curved?? I'm not sure which way. The arrow weight weren't exactly even numbers but they were within a grain or two. I think the 300 was actually 305. It's bed time ;D ;D
bownarra:
--- Quote from: sleek on September 28, 2020, 12:09:59 pm ---
--- Quote from: bownarra on September 28, 2020, 12:26:20 am ---By the way guys - what exactly is it you are trying to work out?
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I WAS WRONG IN THE STATEMENT BELOW, BUT AM LEAVING IT BECAUSE IT WAS REFERENCED IN OTHER REPLIES. sorry for yelling :)
Exactly how much wood is required to make a bow. Or more specifically, how little we can get away with.
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I think you need to set out a theory first then try to prove it or not :)
At the end of the day wood has hysteresis.....you can't change that. Now what do you intend to do about it and what can you do differently that will help 'offset' these losses?
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