Help! On arrow KE and Selection

[cnelk]

OK.
Its snowing, and Saturday morning, so I built a fire in the wood stove in my shop and did some arrow testing.
I shot 3 different weights of arrows thru the chrono.
Used the KE calculator on bowsite to get the KE
And the results surprised me!

What\'s your input???

Arrow base specifics:
GoldTip 55/75 XT Hunter
28 inch
Standard GT .246 insert
3 Feather fletching
Standard GT nock
100gr Field point
365gr [weighed on reloading scale]


Bow:
2013 PSE Drive
27.5 DL
62#
QAD HD drop-away

Here are the results:

Arrow 1
365gr
285fps
KE 66 ft/lbs

Arrow 2
405gr [40gr of trimmer line added]
265fps
KE 63 ft/lbs

Arrow 3
445gr [80 gr of trimmer line added]
255fps
KE 64 ft/lbs

 

[Buglemaster]

On paper arrow # 1 looks like the best as far as flat shooting & leads in KE.....but......unless that light arrow ends up slipping between ribs or connects on a major artery or vein, your tracking skills just might be put to test. I\'ve killed elk with lighter arrows, but the advantages of a heavier arrow out weigh the speed & trajectory advantages of going light. If your brave enough, try shooting those same 3 arrows through that chronny at say 40 yds... I\'d like to see those results as long as it\'s your chronograph.

 

[WW]

Interesting! Kinda blows all that theory crap out the window if your figures are right. I would think the heavier arrow would have more KE even thought it was much slower in FPS. 3-4# of KE is nothing but the liter arrow needed a lot more speed to attain the same KE. But before you select the arrow you want to use this fall, go outside and shoot at long distances 40-60 yds and report back on your trajectory findings. Also, let us know if you noticed any difference in bow noise between the light arrow and the heavy one. Keep tinkering! :lol:

Any of the three have more than enough KE to punch an elk with. It\'s what\'s up front on the business end that counts if it is SHARP.

FYI: Snowing here to. Dang stuff! :crazy:

 

[cnelk]

Lets not forget that KE is different than Momentum

I also posted this over on bowsite, getting some interesting replies

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[Bob Frapples]

I wish I still had time to tinker with stuff like that, to many irons in the fire.
Are you going to shoot them in a target and compare the penetration?

Ever since I went back to school to get an associate degree and took that algebra class in a summer course I\'ve sworn off combining mathematics with the alphabet.

KE=(1/2)mV^2

 

[cohunter14]

Brad, as you know I am not an archer, but I think the same information can apply from a rifle as a bow. The KE will typically go to the lighter, faster bullet at closer ranges. However, as you get further and further out, the heavier bullet maintains a higher KE. I would think the KE\'s of these would differ at 20 yards, 40 yards, etc with the advantage moving towards the heavier arrow. Thoughts?