HuntingNet.com Forums - View Single Post - WHAT IS MY ARROW SPEED-KE?
View Single Post
Old 09-19-2003 | 03:03 PM
  #3  
Matt / PA's Avatar
Matt / PA
Giant Nontypical
 
Joined: Feb 2003
Posts: 5,497
Likes: 0
From: Dover, PA USA
Default RE: WHAT IS MY ARROW SPEED-KE?

You ready for all this........

Here goes:


Your arrow........
Shaft=294 (good job!)
Insert=23
Nock=13
Vanes=27
Point=100
Total FINISHED arrow weight = 457grs.

Your speed.........THESE ARE APPROXIMATES!! (But should be FAIRLY close)
***Max IBO 310fps @30" /70#***
Start at 310fps-10 (29" draw length) = 300
300-3 (peep)=297
297-5 (whiskers)=292

Here' s the biggie: You are shooting at 65# which now makes your IBO legal arrow 325grs. With a 457gr arrow you are 132grs OVER IBO rated weight.
Most bows I' ve seen these days lose about 1fps for every 2-2.5 grs of weight added over that number. I' ll call yours 2.2
Take 132 divided by 2.2= 60fps.

SO take your 292-60= 232fps
I' m also gonna scrub off a few more just because we are guessing against the MAX IBO speed.
I' ll guess your grand total speed at right around 230fps

Your Kinetic Energy.......
457grs at 230fps= 54 ft/lbs

And there you have it........plenty of KE for any fixed broadhead you choose, and if you try mechs stay with the proven penetrators with modest cutting diameters like the Rocket " Nail Driver" ," Steelehead" etc.


Matt / PA is offline  
Reply