ORIGINAL: TFOX
To be quite honest,I have NEVER seen the kind of results that MeanV has found and inTHEORY it can't,atleast in normal ranges.I do believe that once you reach a certain arrow weight,the ke will start to drop but it is well above the 650 grain mark imo.
BUT,it makes sense to me that if it is possible for a lighter arrow to absorb more of the bows potential energy(than normal)then ke will go up.For no other reason than speedhas increased more than it should.
So, I would be interseted in seeing some testing of the arrows in question.It would also make sense that the heavier arrow of the same material would show more normal findings and ke will not drop off from the 400 gr arrow to the 500 gr arrow.
I can understand what you're saying, but he's shooting a 60# bow, not a 70#-er. I'd agree if it was a 70# 82nd, but being that he's shooting 60# it doesn't surprise me. Punching numbers out, my Trykon XL should achieve maximum KE with an arrow between 450-470grains, above that it drops off a touch and below that it drops off, according to number crunchers. I don't have the kind of money to buy a bunch of arrow and heads and shoot 25 gr variations from IBO to 600-650 grains, but it would be interesting if someone did just this with a bow and posted their results.