THe claim here is that on some bows an increase in arrow mass will cause a reduction in ke.MeanV says he has seenit between 400 and 500 grains. That is counter to the accepted physics which I have posted for you and from several different sources too, so I say that an increase in arrow mass will always result in a reduction in ke. Now if you're right, it should be a very simple matter of posting the results ofjust onetest from a competent lab that supports your claim. If the energy efficiency equation is wrong some of the time then put up or shut up. Show us the data. If you're right, it should be easy, you need find only one exception to the rule.

There are mountains of data from competent labs showing ke always increasing as a function of mass (i've posted some for you) but you obviously can't test every bow that has ever been made in order to prove it's always true just like you can't test every force that has ever acted on every mass to prove F=ma. But until somebody comes along with a confirmed test that shows the exception then the rule stands and you guys are just blowing smoke.