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Old 05-15-2008 | 08:11 AM
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OHbowhntr
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From: SE Ohio
Default RE: What arrow mass will achieve tha maximum momentum?

Bryce,
You sound like you want some SPEED too, so I'm punching numbers and at 30" and 73#, assuming you have speed mods on that 82nd, and the birth certificate is close to 342 IBO, correct me if it's not (Bowtech's are notorious for being below the "advertised IBO"). But if your bow CAN spit out a 342 IBO, based off of that guestimate, you can get a 560gr arrow to zip real close to 300FPS, while packing a WHOPPING 111.92 ft/# of KE and .7457 slug/ft of momentum. That's almost enough energy to punch through and ELK shoulder, and certainly enough for ANY whitetail or bear, provided you have a sufficient BH on the fore-end of that arrow.
Really want speed, you can put a 450gr arrow out there at 322fps, while holding onto 103.98f t/# of KE and .6444 slug/ft of momentum.

Wanna save your shoulders, drop the draw-weight to 65#, and you still can launch a 450gr arrow at 308fps, with 94.9 ft/# of KE and .6156 slug/ft of momentum, still more than enough energy for anything here in North America, while giving yourself a little "safety valve" on one of those cold MN mornings when the muscles aren't sure if they're up to the challenge.

FWIW, an IBO arrow would give you 93.71 ft/# of KE, with .55 slug/ft of momentum. So a 560gr arrow would be very much quieter, though a bit slower, but would pack 35% more momentum, and 19% more KE. But you could feasibly drop weight to 65# w/ a 450gr. arrow as mentioned, and still gain about 12% momentum, while picking up or maintaining about the same KE as an IBO arrow at 73#.

For $25 you can get a copy of OnTarget2 here: http://www.pinwheelsoftware.com/ or you can get the FREE TRIAL version to see if you like it, then buy later. It's a nice program to have, and guides you through a variety of set-ups so you can decide what "should" work best for you, whether it is CHASING FPS, or launching a fence post.

Hope some of that helps!!!
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