will an arrow with the same foc and the same fletching but one has 5 more ft/lb's of ke.The one with 5 more ft/lb will straighten out faster,OR WILL IT ?,Why is that?Is it because of momentum or is it because of ke.
I honestly have to say, I don't know. But if you're talking shooting the same weight arrow faster in order to pick up the extra 5 ft lbs of KE, you gotta remember you're also picking up more momentum at the same time.
If you want to get into fluid dynamics there is something else to consider... Since resistance increases by the cube of speed (speed X speed X speed) then the fletching is going to have more air resistance and so will have a bit more effect on the faster arrow than it will on the slower arrow. And so will the broadhead blades on a poorly tuned arrow.
To pick up 5 fps, that's like shooting a 400 grain arrow at 290 fps vs the same arrow at 281 fps. The 3% increase in speed gives you a 9% increase in resistance. In theory, the arrow could stabilize 9% sooner at 290 than it would at 281. Hardly worth the effort, in the grand scheme of things.
What would happen if you dropped arrow weight to 350 grains and drove it at 310 fps to get 75 ft lbs of ke? Resistance would increase by 26%. Possible it would stabilize 26% faster? Maybe. Maybe you could get the same stabilizing effect with 26% less fletching area. I dunno.
On the other hand, you've sacrificed some momentum at the same time you've increased resistance to the broadhead, so what would that do to penetration?
Anybody besides me confused all to heck yet? LOL
