ORIGINAL: mobowhuntr

Hmmmm./.....I don't buy it. A heavier arrow will ALWAYS produce more KE is just not accurate. I am shooting a 400 gr arrow 290 fps. giving me KE of 75 ft pds. Now, if I increase my arrow weight to 700 gr but the speed slows to 200 fps (which is probably faster than reality) my KE drops to 62 ft. pds.

It's a delicate balance. The trick to KE is to get the heaviest arrow you can flying as fast as you can. There is a happy medium where the optimum for both is achieved. Eventually, the weight of the arrow will slow it down just too much and your KE will drop. Likewise, there is a point where the arrow is just too light and it drops also.

Mementum and KE go hand in hand, but aren't the same thing. I do agree that a heavier arrow will retain more momentum than a light arrow. I mean, which can you throw farther, a light pebble or a heavier rock? But see, I can't throw a boulder at all. Which brings us back to my main point....heavy is not always better. You gotta find the balance.