Derek
Joined: 14 Jul 2008
Posts: 9
Location: Fort Wayne, Indiana
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| Posted: Fri Aug 22, 2008 3:56 pm Post subject: ...to get a good arrow blow-through |
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I had heard the other day that in order for a carbon arrow with an over-the-top expandable mechanical broadhead requires at least 50lbs to get a complete blow-through or pass-through when it hits a deer. However, the source that I've heard this from isn't one that I trust on a regular basis.
Curious....is there some type of formula (of draw weight plus draw length or something) that would confirm the above?? |
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Whelland
Joined: 16 Jan 2007
Posts: 511
Location: Kingston, MI
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| Posted: Sun Aug 24, 2008 11:56 am Post subject: |
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The arrow weight and bow speed is what you need to know. These are the key components in figuring out the KE (kinetic energy) and will determine how your set-up will do on the game you hunt. The formula for kinetic energy is as follows:
(Total arrow grain weight) divided by (450,435) multiplied by (speed of bow) X (speed of bow).
Most bows with a 50-pound draw weight will produce adequate kinetic energy for hunting. For example, a bow that will shoot 255 fps with an arrow weight of 350 grains will give you about 50 ft-lbs. of energy. With a cut-on-impact type broadhead, a bowhunter will have a set-up that will complete a pass through shot on any game animal here in the Midwest. |
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