Need to determine Lenght of arrow
 

I just chronoghraphed by new Mathews LX today @ 250fps. Its a 60 lb draw at 28 inches. I use a 100 grain point, and Beman 400's. I am trying to figure the KE. According to the Beman site, the nock is 13 grams, the insert is 21 grains and the arrow is 8.4 grains per inch. My arrow from tip of nock to the end of the carbon is 28 3/4 inches. So my guess is my total arrow weight is 375.5 grains.

So at 375.5.grains @ 250 fps me KE is 52.10. Would this be correct and is this the right speed and KE for this type of bow>

RE: Need to determine Lenght of arrow
 

NYSHunter, you forgot to add the weight of your feathers/vanes.

I am assuming that you had the arrow fletched?

If so, post what type/size/brand of fletch, and I may be able to give you an accurate weight.

RE: Need to determine Lenght of arrow
 

These are the vanes that came on the the shafts. I just got my fisrt bow last week and the shop set up the arrows for me. There are 3 vanes, 4 inches each. Sorry I do not have more details, but I do thanks for any help you can provide.

RE: Need to determine Lenght of arrow
 

OK, sorry to take so long. Had to help take down the christmas tree![X(]

I weighed two different brands of 4" vanes, and came up with 29 grains, and 30 grains per 3 vanes. If we go conservative and use 29 grains, adding that to your other numbers(which are accurate)we get a total arrow weight of 404.5 grains.

At 250 fps, this translates into 56.15 ft.lbs. of KE.

Enough to blast through any deer walking.

I don`t think it is enough KE to use some of the real big mechanicals, but you might want to check out 5 shots data for that.

BTW, that is a pretty sweet rig for your first bow!:D

RE: Need to determine Lenght of arrow
 

Thanks for your help. I really do appreciate it. My wife got me the bow as a Christmas present. I am hooked into the sport. I cannot wait for next season to begin.

One question, is 56 lbs of KE enough for even an Ekl? I have been asked to go on an Elk hunt this year during the bow season. I am seriously considering it.

RE: Need to determine Lenght of arrow
 

With a quality broadhead, and GOOD shot placement, you will go through an elk like a hot knife through butter!:D

Better get to practicing quick, and we demand pictures of all harvested critters!;)

RE: Need to determine Lenght of arrow
 

Here's the weight of my ICS 400s

29" Shaft 252 gr.
8/32 RPS insert 21 gr.
Easton Super Nock 13 gr.
Field point or broadhead 100 gr.
(3) 4" vanes 14.7 gr.
Total 400.7 gr.

At 250 fps, that's about 55.62 ft/lbs of Kenetic energy.

I shoot a Mathews Legacy.