![]() ![]() Letoff the reduction in draw force from a bow's peak weight to its holding weight at full draw, expressed in a percentage.Ībsolutely. IBO speed This is the speed for a bow set at 70-pounds draw weight, 30 inches draw length, and shooting arrows weighing 350 grains (5 grains per pound of draw weight). For example, AMO letoff is now called ATA letoff.ĪTA speed This is the speed for a bow set at 60 pounds draw weight, 30 inches draw length, and shooting arrows weighing 540 grains (9 grains per pound of draw weight). Thus, former AMO industry standards are now ATA standards. ![]() Feet per second (fps) Throughout the text, fps refers to feet per second, a measurement of initial arrow speed, normally 3 feet from the bow.ĪTA This is the Archery Trade Association. ![]()
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