![]() bow may lose one foot per second for every additional three grains of arrow weight for arrows near 350 grains, but for arrows near 450 grains it may take 4 grains of arrow weight to reduce the speed one foot per second. ![]() draw weight) most bows will change one foot per second with added arrow weight of more than three grains. the height of the surface of the water above mean water level (. In this example, a guesstimated angle of 45 degrees and a 28 yard straight line distance will require an aiming distance of 19. This is the distance needed for the calculation. As a result, as arrow weight increases much beyond IBO/ATA specs of 5 grains per pound of bow draw weight (350 grain arrow at 70 lbs. The amplitude (or wave height) at angle through the wave is its surface profile i.e. Use the straight-line distance to the target. As arrow weight increases, bow efficiency also increases. Note: This calculator makes the assumption that increasing or decreasing arrow weight by 3 grains will change the speed by one foot per second. draw weight, 350 grain arrow) will affect the speed.įor more information on estimating speed, please see the How to Estimate Bow/Arrow Speed articleĮnter actual draw length of the bow (inches)Įnter additional weight on the string (grains) ![]() ![]() Archers can use this calculator to get an approximate idea of how changing the bow from IBO/ATA specifications (30″ draw length, 70 lb. This calculator will estimate the speed of the bow/arrow based on the speed rating of the manufacturer and individual setup of the bow.
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