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dla
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Location: Hillsboro, Oregon
Joined: 07/21/2007
Posts: 5
Old versus new Beman Carbon penetration

I've used Beman carbon arrows for a long time. I finally exhausted my supply of shafts and glue-on components, so I bought some Beman ICS camo hunter arrows.

I was bummed out a bit when I saw that I was getting 1/2 the target penetration I was accustomed to with the old Bemans.

Gathered a little data. Both arrows Finished length 30.5", 4" plastic fletch, 100gr tip, spine is 75/85 for old carbon and ICS 300 for new.

Old-style Beman Carbon:

    419gr
    245fps
    0.241" shaft diameter

Beman ICS Camo Hunter:

    481gr
    232fps
    0.305" shaft diameter

So although the speed went down by 5.3%, the momentum increased by 8.7%, KE increased by 3%, yet the penetration decreased significantly. Decrease in penetration is due to shaft diameter increase and perhaps the camo finish. I don't know why Beman went to fat shafts, but they traded off penetration.

Summary: skinny carbons rule![/]

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