Hey Arthur,I can't believe you are still arguing this same old argument.I swore I was going to stay out of this ,this time.


The example you just showed leave out one of MANY variables.You know I believe that speed fights friction so that may help to explain some of the penetration power of the light arrow.


I agree that ke helps with penetration but momentum is the driving force.Ke will help the arrow maintain a straight path by the amount of naturall energy the arrow has to stay parralel to it's original path, and momentum will drive the arrow through while speed will help with fighting off friction.Bone hits without a doubt need more bone crushing power to penetrate so naturally a heavy arrow will be better but we do not always hit bone.Sometimes it is just a matter of friction and light fast arrows MAY actually be better in those instances.


We must remember that an arrow that is penetrating something is more like a machine trying to do a job.It is not a math problem.Yes theories can be proven or disproven with math problems but it is next to impossible to add ALL VARIABLES into the equation.

Those math problems don't take into account arrow compositon(material),wall thickness(aluminum),foc,TUNE,wind,fletching.etc,et c,etc.My ACC's maintain more of it's original ke and momentum downrange than aluminum.When they hit something,they flex less and drive forward so naturally they require less weight to do the same job.

I know for a fact that an arrow weighing over 700 grains with 5% foc can't penetrate as well as a 350 grain arrow with 11% foc,out of the same bow with a good tune on both.I know because I have tested it on board and foam.The heavy stopped dead and the light arrow drove through.Balance and tune,to me are more important than just a number.


Cougar has found a tried and true method for penetration.Get a PROPER SPINED arrow,balance it out and make sure the aluminum is of a thick walled variety and penetration will be awesome.The most important thing he is doing is shooting arrows that are matched to his setup and balanced right.


I do the same as far as spine and balance but I choose an ACC that is lighter but works just as well.I just laugh everytime I have to pull my arrows out of the ground that are buried deep after passing through an animal,WHILE shooting mechanicals that all the experts say are too light and the heads require too much energy to open.That out of a 58# setup @ 28 1/2" draw.A whopping 52.7 ft/lb's of ke energy.(give or take)And then remeber back to using heavy 2413's that weigh a BUNCH more with fixed heads yielding poor penetartion for me in the field.


This argument will never be settled,when physics seems to be on the side of heavy arrows but many are experiencing something a bit different in the field.Now,I think I will back out of this one for the time being.