ORIGINAL: buckeyebuckhntr
The bowling ball/ ping pong ball quote is mine. It was a gross exageration to show a point. If you keep the velocity the same for the 400 gr arrow and the 500 gr arrow, the difference is big.... not irrelevant.
It very much is irrelevant..... You are speaking in "ifs".... How do you plan on keeping the velocity the same with a 100 grain swing in arrow weight????
Keeping all things equal (draw weight and draw length) it is impossible. I can't even understand why you would post such a gross exaggeration of an unattainable comparison.
Once again apples and oranges.....
I'd bet it was in reference to two different bows. I'm only guessing here because you are correct B, a bow has a set amount of KE that bow produces. As we gain arrow weight, we loose speed and they offset one another leaving the same KE. Same in reverse. As we loose arrow weight, we gain speed, they offset each other and we have the same KE.
The only way to have that jump in KE do to both a gain in arrow weight and speed, it's with two different bows.