Full Quiver
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I.B.O. (International Bowhunters Association)
IBO speed is calculated using the following criteria:
Total Arrow Weight = 350 grains (5 grains per lb of draw weight)
Draw Weight = 70 lbs
Draw Length = 30"
A.M.O.(Archery Manufacturing Organization)
To discover the AMO Speed a bow is set at:
Total Arrow Weight = 540 grains
Draw Weight = 60 lbs
Draw Length = 30"
For today's compounds, speeds over 240fps are considered fast while anything under 220fps are relatively slow.
some generalizations about the two different ratings we could say that the I.B.O. speed rating is much faster than most archers could achieve, and conversely the A.M.O. speed rating reflects a speed that is less than what most shooters could achieve with the same bow. If a bows I.B.O. speed rating is 320fps and its A.M.O. speed rating is 245fps that would mean the average archer would shoot that bow somewhere in the middle of that range.
IBO speed is calculated using the following criteria:
Total Arrow Weight = 350 grains (5 grains per lb of draw weight)
Draw Weight = 70 lbs
Draw Length = 30"
A.M.O.(Archery Manufacturing Organization)
To discover the AMO Speed a bow is set at:
Total Arrow Weight = 540 grains
Draw Weight = 60 lbs
Draw Length = 30"
For today's compounds, speeds over 240fps are considered fast while anything under 220fps are relatively slow.
some generalizations about the two different ratings we could say that the I.B.O. speed rating is much faster than most archers could achieve, and conversely the A.M.O. speed rating reflects a speed that is less than what most shooters could achieve with the same bow. If a bows I.B.O. speed rating is 320fps and its A.M.O. speed rating is 245fps that would mean the average archer would shoot that bow somewhere in the middle of that range.
