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.
Check out bigbulls findings on the same model Bow. Interesting to say the least. All arrows were as close in spine as possible in my tests. I know the mags don't tune for every different arrowsetup.
Dan