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Arrow Speed vs. Weight
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Originally posted by JES View Postso ran some numbers on a Ke/momentum calculator, negligible difference in the two weights. Both still suitable to kill any game animal on the planet, that's right, the entire planet, let that soak in. Sounds like anything about 500 grains is wasted.
The information I gleaned out of this post was the speed difference I would get by dropping the weight.
530 grains @ 259 fps = Ke 78.93 ft-lbs and Momentum .609 slugs
505 grains @ 267 fps = Ke 79.92 ft-lbs and Momentum .599 slugs
If you are basing a calculated off of a true chrono reading of the 530gr. Then you cannot use that number to back down. Calculators cannot adjust for efficiency.
With a perfect shot that arrow may or may not kill every animal on the planet. Most places you Hunt Cape buffalo require around 700 to 750 minimum to even hunt them. Must be even more to hunt ElephantLast edited by enewman; 06-08-2019, 09:57 AM.
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This is what I’ve learned from all the post about speed & weight. I wanted a to shoot faster with a heavier arrow. My fix, bought a faster bow. 496gr Goldtip Pierce shooting 286fps. Plenty fast & plenty of momentum. I’ve also learned I don’t pay much attention to ke anymore cause momentum is what’s driving the arrow.
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Your bow generates a fixed amount of energy at a given draw weight & length. A lighter arrow will absorb less of that bow's stored energy and a heavier one will absorb more of it. So even though the lighter arrow is faster than the heavier arrow, the lighter arrow's KE will ALWAYS be lower than the heavier arrow's due to the difference in absorbed energy.
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Originally posted by BernieH View PostYour bow generates a fixed amount of energy at a given draw weight & length. A lighter arrow will absorb less of that bow's stored energy and a heavier one will absorb more of it. So even though the lighter arrow is faster than the heavier arrow, the lighter arrow's KE will ALWAYS be lower than the heavier arrow's due to the difference in absorbed energy.
so you're saying if a 500 grain arrow @ 300 fps has less Ke than a 550 grains @ 200 fps? Hell, 550 grains @ 285 fps is less Ke than the 500 @ 300 fps, just below, but still less. Run the numbers if you don't believe me.
I think some of y'all are so OCD about heavy arrows you ignore the energy you gain from the speed of the arrow. Now, I'm no speed freak, it's about balance for me and like Sleepy said, it's finding that balance that's right for each individual.
PNL
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Originally posted by JES View PostThat's not true at all. Go run the numbers yourself, I posted what you need.
so you're saying if a 500 grain arrow @ 300 fps has less Ke than a 550 grains @ 200 fps? Hell, 550 grains @ 285 fps is less Ke than the 500 @ 300 fps, just below, but still less. Run the numbers if you don't believe me.
I think some of y'all are so OCD about heavy arrows you ignore the energy you gain from the speed of the arrow. Now, I'm no speed freak, it's about balance for me and like Sleepy said, it's finding that balance that's right for each individual.
PNL
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data on efficiency
all numbers are shot through a chron. no calculations were done to find fps. if you will notice as arrow weight increases fps go down but KE increases. if you want to see where your calculator stops working use the first arrow and match fps. then start changing the weight. you will see at around 500gr a calculator is no longer valid.Last edited by enewman; 06-08-2019, 06:47 PM.
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Originally posted by enewman View PostYou need to look at what you are saying. You are incorrect. Your example is so far at there it’s not even funny. If you shoot a 500 and then a 550 from the same bow there will never ever be a 100 fps difference. The chart I posted is what happens when shot. Not a calculation. You can just google it. I’m sure you will find tons of articles showing what in saying.Originally posted by enewman View Posthttps://1drv.ms/w/s!AtVqxLy9AZcGkgak-rih-etDDQar
data on efficiency
all numbers are shot through a chron. no calculations were done to find fps. if you will notice as arrow weight increases fps go down but KE increases. if you want to see where your calculator stops working use the first arrow and match fps. then start changing the weight. you will see at around 500gr a calculator is no longer valid.
Enjoyed it, have a great day and shoot what you're confident with!
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