Kinetic Energy and your arrow

Putting an arrow in a bow, that is heavy with more spine, does not mean you will see a difference in performance of the penetration. This is because the way to change kinetic energy in an arrow by any appreciable amount is by changing the bow; yes that’s right I said the bow. Sometime when you’re not doing anything, play around with a Kinetic Energy calculator. I believe that you will be surprised. The best way to get more penetration is to “Bow up” or change the style of broadhead you are using, unless you’re shooting an 80 lb bow with a very fast IBO speed rating. You will be disappointed with a three blade mechanical broadhead unless it is a rear deployment style. Considering which arrow construction to use has more to do with the cam design, draw weight, arrow rest, and release that you will use. Below is an actual test of my bows and arrows that I personally use.

Calculate percentage difference in Kinetic Energy
between Ke1 = 77.56Ke and Ke2 = 79.9 Ke
[(Ke1 - Ke2) ÷ ((Ke1 + Ke2) ÷ 2)] * 100 
= [(77.56Ke - 79.9Ke) ÷ ((77.56Ke + 79.9Ke) ÷ 2)] * 100 
= [-2.34 ÷ (157.46÷2)] * 100 
= (2.34 ÷ 78.73) * 100 
= 0.029722 * 100 
= 2.9722% difference in Kinetic Energy (that’s right, gaining less than 3% Kinetic energy)
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Calculate percentage difference in Speed
between V1 = 326 and V2 = 302 (measured in feet per second “fps”)
[(V1 - V2) ÷ ((V1 + V2) ÷ 2)] * 100 
= [(326fps – 302fps) ÷ ((326fps + 302fps) ÷ 2)] * 100 
= [24 ÷ (628 ÷ 2)] * 100 
= (24 ÷ 314) * 100 
= 0.076433 * 100 
= 7.6433% difference in Velocity (that’s right, more than 7.5% loss in speed)