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RE: Dumb Question/Momentum and Broadheads
So if I shoot a a.)400 gr(total arrow weight) vs b.)600 gr(total arrow weight), same razor sharp broadhead at say, 30 yds, except one bow is shooting this arrow a. at 320fps and b. at 250 fps, which one has more penetration and why? |
RE: Dumb Question/Momentum and Broadheads
ORIGINAL: PreacherTony ORIGINAL: bawanajim ORIGINAL: PreacherTony ORIGINAL: bawanajim Velocity squared X weight divided by 450395 will = kinetic energy.:eek: That should add to the confusion.;) If it stops raining some time soon I might hit the lake at the end of the week, this low pressure fron is killing us. |
RE: Dumb Question/Momentum and Broadheads
ORIGINAL: PreacherTony ORIGINAL: TFOX The answer to 1 is on a heavy bone hit. 2 will be debated but the fact is friction decreases with speed but resistance increases.;) IMO,Heavy bone doesn't really care how sharp the head is. yep or another anology would be- try and drive a nail in backwards on a piece of wood. |
RE: Dumb Question/Momentum and Broadheads
ORIGINAL: PreacherTony ORIGINAL: TFOX The answer to 1 is on a heavy bone hit. 2 will be debated but the fact is friction decreases with speed but resistance increases.;) IMO,Heavy bone doesn't really care how sharp the head is. I am not saying use a dull head but the bone is not going to slice apart like flesh or skin.A chisel point will do the majority of the work on a hard bone hit.Bone will most often shatter with momentum ime.That sharp head won't be sharp very long when in contacts bone. |
RE: Dumb Question/Momentum and Broadheads
ORIGINAL: zrexpilot ORIGINAL: PreacherTony ORIGINAL: TFOX The answer to 1 is on a heavy bone hit. 2 will be debated but the fact is friction decreases with speed but resistance increases.;) IMO,Heavy bone doesn't really care how sharp the head is. yep or another anology would be- try and drive a nail in backwards on a piece of wood. that last anology is incorrect, your dealing with pressure/in^2. Not sharpness. |
RE: Dumb Question/Momentum and Broadheads
Wrong, the sharper , the pointier the easier the penetration on bone, ply wood , skin, meat, whatever.
Its all pressure. With enough you can make something dull and flat penetrate steel. With a given velocity, or pressure or kinetic energy, whatever you want to call it, the pointier or sharper the easier the penetration. I can cut through the ribs of a deer with a simple sharp knife, try it with a dull one. |
RE: Dumb Question/Momentum and Broadheads
ORIGINAL: zrexpilot Wrong, the sharper , the pointier the easier the penetration on bone, ply wood , skin, meat, whatever. Its all pressure. With enough you can make something dull and flat penetrate steel. With a given velocity, or pressure or kinetic energy, whatever you want to call it, the pointier or sharper the easier the penetration. I can cut through the ribs of a deer with a simple sharp knife, try it with a dull one. |
RE: Dumb Question/Momentum and Broadheads
Yes sharper will penetrate bone better, not so much because its going to slice the bone or even crack the bone. In order to get to the bone you must first go through skin, muscle, cartilage, all kinds of stuff. Thats where the razor sharpness of your broadhead comes into play for penetration on bone. If it can slice through all that stuff with reletive ease it will carry more momentum to break that bone and keep going. There are differant kinds of penetration, the slicing kind which you need to go through muscle and organs and then the breaking/crushing kind which is needed to go through bone. To penetrate bone you need a sharp point but most importantlyyou needjust pure force to break it and keep on going.
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RE: Dumb Question/Momentum and Broadheads
ORIGINAL: passthru79 Yes sharper will penetrate bone better, not so much because its going to slice the bone or even crack the bone. In order to get to the bone you must first go through skin, muscle, cartilage, all kinds of stuff. Thats where the razor sharpness of your broadhead comes into play for penetration on bone. If it can slice through all that stuff with reletive ease it will carry more momentum to break that bone and keep going. There are differant kinds of penetration, the slicing kind which you need to go through muscle and organs and then the breaking/crushing kind which is needed to go through bone. To penetrate bone you need a sharp point but most importantlyyou needjust pure force to break it and keep on going. Bingo ! this is why fixed blades will always penetrate bone better than a mechanical. Been there done that ! I will never use mech. again. I killed a bunch with mech. But given enough time you will see what I am talking about, mech. lose chingos energy on the rearward deployment, now contact bone. Blah they are out of steam. |
RE: Dumb Question/Momentum and Broadheads
Ever considered how much momentum would it take to get a passthrough on a broadside deer at 20 yards?
This is / is not a hypothetical question, since I have an estimate based on hunting results with my wife's equipment. |
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