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Arrow Speed and Kinetic Energy
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<blockquote data-quote="MZmoose" data-source="post: 603542" data-attributes="member: 41085"><p>Im no physics major, but I have some real world experience. I too believe the momentum equation more closely fits the performance of an actual hunting arrow. Many long bows, and traditional recurves would have trouble reaching the kinetic energy figures listed to cleanly take the various game animals. They don't have much speed (less than 190 fps) but what they do have going for them is very heavy arrows. I have seen heavy arrows pass thru bull elk and sail out the other side, killing them quickly. The way I see it the broadhead is what kills the game, it cuts the tissue and destroys organs. The shaft is just a way of getting that broadhead to, and through the target. You can put that broadhead on a straw and shoot it at a deer or you can put it on a shovel handle and shoot it at a deer. Obviously this is an extreme example but the extra weight of the shaft and increased momentum will push that broadhead through more muscle and bone than a lighter fast one. Maybe someone should find a uniform test medium and use one broadhead on several arrows with increasing shaft weights (the shafts would have to be the same diameter to keep it fair) and then see if the penetration results compare to the kinetic energy formula or the momentum formula. Just a thought. As far as speed vs weight for time of flight and range estimation, you are 100 percent correct. Faster arrows help with string jump, and if your range estimation off a bit that extra speed will help. Great article.</p></blockquote><p></p>
[QUOTE="MZmoose, post: 603542, member: 41085"] Im no physics major, but I have some real world experience. I too believe the momentum equation more closely fits the performance of an actual hunting arrow. Many long bows, and traditional recurves would have trouble reaching the kinetic energy figures listed to cleanly take the various game animals. They don't have much speed (less than 190 fps) but what they do have going for them is very heavy arrows. I have seen heavy arrows pass thru bull elk and sail out the other side, killing them quickly. The way I see it the broadhead is what kills the game, it cuts the tissue and destroys organs. The shaft is just a way of getting that broadhead to, and through the target. You can put that broadhead on a straw and shoot it at a deer or you can put it on a shovel handle and shoot it at a deer. Obviously this is an extreme example but the extra weight of the shaft and increased momentum will push that broadhead through more muscle and bone than a lighter fast one. Maybe someone should find a uniform test medium and use one broadhead on several arrows with increasing shaft weights (the shafts would have to be the same diameter to keep it fair) and then see if the penetration results compare to the kinetic energy formula or the momentum formula. Just a thought. As far as speed vs weight for time of flight and range estimation, you are 100 percent correct. Faster arrows help with string jump, and if your range estimation off a bit that extra speed will help. Great article. [/QUOTE]
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