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whats the formula
headzilla97
Member Posts: 6,445
For figuring out how much kinectic energy your bow has. I had a it speed tested today at the bow shop and its shooting a disapointing 249 fps. [:p]
Comments
for KE in foot pounds, you will take KE = 1/2 mv^2
you need to change grains to pounds though. I don't know what the conversion is, maybe there is one on the internet somewhere
Thats what Im getting out of the ultra sport. the guy at the bow shop says it wasnt to fast but he said it was delivering a hell of alot of kinetic energy by the way it sounded when it hit the video wall. all u heard was wasoooohsh whack dead deer. "the dead deer part was added by me of course"
With my axis arrows my Ultramag was shooting low 260's. When I am done shooting 3d, am will be currious to see what the new string does for my speed. I should be shooting in the 285-290 range with my GT ultralights, but I haven't ran it through a crono. My guess is its on the low end of that range or just under.
I shoot 289 with my hunting arrows and 320 with my 3-d arrows out of my outback.
Do I need to say of course its a Mathews![:D]
so i figure 400 grain arrow 100 grain for the head 20 for nocks and inserts and 15 for the vanes sound about right that gives me 72.98 lbs of thumping power. it says its high enough for moose nice. time to blow through some deer then
400 grain arrow? what are you shooting logs?
Im shooting the new easton full metal jackets at 400 grains or 9.9 grains per inch
Uless you meant 400 grain total ya better weigh them arrows bro because at 9.9 per inch a 30 inch raw shaft weighs 297. So add 35 for insert vanes and nock+100 broadhead, you have 435 grain arrows. My arrows weigh 420 total with 100 grain head.