Hopefully this post will clear the waters...
These 3 bows were delivered to me back in 2004 to celebrate Tradgang's 1st Anniversary. I have been hunting with the 60 & 70#ers ever since, and Rob has been hunting with the 50#er since then till about 2 years ago when he sent it to me so I could use it in my golden years. (not there yet
)
So, all made at the same time, by the same bowyer, all the same model, all the same lengths, all the same materials, all the same draw lengths. All also use the same arrow, weight was increased for the 60#er by adding aquarium tubing and head weight change, and the 70#er with weed eater line inside the aquarium tubing and different head weight. All arrow weights were right at 9.5 grains per #, and arrow speed was right at 185-187FPS with all 3 bows. Although the speed might be relevant to the hunter, it is irrelevant in the test as long as all 3 are very close to the same, as well as arrow speed.
Here are the numbers I ran on them back then..... Kinetic Energy and Momentum.
50# - KE = 37.99 - MO = .411
60# - KE = 45.59 - MO = .493
Difference in Percentages - KE = 27.795 % - MO = 19%
This is a very significant increase of power in the two bows.
*************************************************************
50# - KE = 37.99 - MO = .411
70# - KE = 53.19 - MO = .575
Difference in Percentages - KE = 55.804 % - MO - 39.903 %
This is a HUGE increase in the power of the two bows.
Momentum is really the most important number, and its right at a 40% Increase.
So, if the OP old_goat2 went from 45# limbs to 65# limbs, he would expect very close to those same percentages in increase of power.