No Chrony
07-28-2005, 03:21 PM
#1
Thread Starter
Join Date: Feb 2003
Location: Decatur MS USA
Posts: 47
No Chrony
I am not near a chronograph and I would appreciate you experts on speed, give me an idea how fast.
Switchback, 28" draw, 70 lbs pull, nothing on string but a loop.
Trophy Taker Shaky Hunter rest
GT Expedition Hunter 5575 arrows 27 1/4" from end of insert to split in nock.
4" straight vanes
100 grain field tip
Any more info I need to give?
Thank you all for helping a dummy
Switchback, 28" draw, 70 lbs pull, nothing on string but a loop.
Trophy Taker Shaky Hunter rest
GT Expedition Hunter 5575 arrows 27 1/4" from end of insert to split in nock.
4" straight vanes
100 grain field tip
Any more info I need to give?
Thank you all for helping a dummy
07-28-2005, 05:02 PM
#3
Giant Nontypical
Join Date: Feb 2003
Location: the woods of NJ.
Posts: 5,643
RE: No Chrony
Simple with the following generalizations. Start with the IBO speed for your bow.
Subtract 10 fps for every inch of draw length you are below the 30 inch "test standard".
Next subtract approximately 1 fps for every 3-4 grains of arrow weight you are above the IBO "test standard" arrow weight of 350 grains. (a 460 grain arrow would cost you about 27-34 fps)
Next add or subtract approximately 1.75 fps for every pound of draw weigth you are eitherover or under, respectively, the IBO "test standard" weight of 70 pounds.
Lastly, subtract approximately 4-5 fps for every string accessory you have installed on the bow...peep sight, string silencers, string loop, etc...
Then take all of those numbers and subtract/add them to your IBO speed rating to determine a fair estimate as to your speed.
Subtract 10 fps for every inch of draw length you are below the 30 inch "test standard".
Next subtract approximately 1 fps for every 3-4 grains of arrow weight you are above the IBO "test standard" arrow weight of 350 grains. (a 460 grain arrow would cost you about 27-34 fps)
Next add or subtract approximately 1.75 fps for every pound of draw weigth you are eitherover or under, respectively, the IBO "test standard" weight of 70 pounds.
Lastly, subtract approximately 4-5 fps for every string accessory you have installed on the bow...peep sight, string silencers, string loop, etc...
Then take all of those numbers and subtract/add them to your IBO speed rating to determine a fair estimate as to your speed.
07-30-2005, 06:39 PM
#7
Boone & Crockett
Join Date: Feb 2003
Location: Lehigh County PA USA
Posts: 12,157
RE: No Chrony
Simple with the following generalizations. Start with the IBO speed for your bow.
Subtract 10 fps for every inch of draw length you are below the 30 inch "test standard".
Next subtract approximately 1 fps for every 3-4 grains of arrow weight you are above the IBO "test standard" arrow weight of 350 grains. (a 460 grain arrow would cost you about 27-34 fps)
Next add or subtract approximately 1.75 fps for every pound of draw weigth you are eitherover or under, respectively, the IBO "test standard" weight of 70 pounds.
Lastly, subtract approximately 4-5 fps for every string accessory you have installed on the bow...peep sight, string silencers, string loop, etc...
Then take all of those numbers and subtract/add them to your IBO speed rating to determine a fair estimate as to your speed.
Subtract 10 fps for every inch of draw length you are below the 30 inch "test standard".
Next subtract approximately 1 fps for every 3-4 grains of arrow weight you are above the IBO "test standard" arrow weight of 350 grains. (a 460 grain arrow would cost you about 27-34 fps)
Next add or subtract approximately 1.75 fps for every pound of draw weigth you are eitherover or under, respectively, the IBO "test standard" weight of 70 pounds.
Lastly, subtract approximately 4-5 fps for every string accessory you have installed on the bow...peep sight, string silencers, string loop, etc...
Then take all of those numbers and subtract/add them to your IBO speed rating to determine a fair estimate as to your speed.
