Remember,when you increase arrow weight you increase momentum RIGHT,we agree on that therefore you are seeing less loss of energy.


The same thing happens when you increase the energy source,The longer draw or heavier poundage produces more momentum.



If you shoot the lighter arrow out of your bow it will have more momentum than it does out of his bow so there is no way you will experience as much of a loss of speed than when comparing 2 different bows with 2 different arrow weights.


You will see a slightly higher percentage of speed loss from the heavy to the light arrows from the same bow but no where near the percentage loss when comparing 2 different bows with different amounts of stored energy.


Now I can go back and read the rest of the responses.