For every 3 grains of total arrow weight above draw weight multiplied by 5, subtract 1 ft/s from the IBO value. You will need to provide total arrow weight and initial speed for the calculation to be effective, as well as some other optional info (see below). At the rated 350 fps IBO the speed should be 319 so we know that the IBO is slightly high. At the time lets call it the Round Cam Epoch the chase was for 200 fps. There are a few more things that impact how fast your arrow is traveling after you shoot. Arrow Efficiency Calculator: Optimize your bowhunting set up. Draw length: A longer draw length creates a longer power stroke than a shorter draw length, allowing the bow to store more energy. 3. I remember when I first started bowhunting; it was right around the time I became a teenager. Arrow speed specification. Reduce the IBO speed until the calculator shows the verified speed of 315; in this case, the correct IBO value would be 346 fps. The same team that conducted the above research suggested a way to calculate the effective range for each bow/crossbow model: Divide the crossbow velocity (in FPS) by 10. Arrow Speed Calculator Bow Manufacturer IBO Speed move slider or enter value ft/sec Draw Weight move slider or enter value lbs Draw Length move slider or enter value inches Arrow Weight move slider or enter value grains Weight Added to String (20gr=peep only, 45gr=peep and tube) move slider or enter value Determining Maximum Range for a Crossbow - Petersen's Bowhunting At the rated 350 fps IBO the speed should be 319 so we know that the IBO is slightly high. Sight compensation of trajectory. To achieve this the arrow will actually intersect with the line of sight twice, giving you a dead center hold on the target for many yards without hold-over or hold-under. It will give you a rough idea of how fast an arrow travels after changing the bow from the recommended specifications. Arrow Speed (FPS): Arrow Weight (grains): Advanced Shaft Length (inches): Shaft Diameter (inches): Fletching Length (inches): Fletching Height (inches): Calculate Reset to defaults Distance (yards) Drop (inches) Arrow Speed (FPS) Kinetic Energy (ft/lbs) Momentum (lb/sec) 0 10 20 The most critical factor is the IBO speed entered as this is the starting point of the calculations. Fast-flying arrows have flatter flight trajectories and less deviation from the wind. ), Any additional weight on your bowstring (nock loop, peep, etc.). The speed of your arrow will determine how flat of a trajectory your arrow has at short and long distances and how much arc is needed to travel large distances. 575 grain arrows will fly at ~84% of initial speed Copyright 2023 | DRCMedia LLC | All Rights Reserved, Scout. Knowing how your arrow speed changes with the increase in arrow weight, you can now easily figure out the new kinetic energy: For instance, if you know your crossbow shoots your current 400 grain arrows with a speed of 400 FPS, our chart above tells you to expect 124.8 ft-lb of kinetic energy at 30 yards. As of 2021, crossbow speeds range between 300 FPS and 500 FPS. Enter speed and arrow weight data into the calculator. This average will get most bows within a few percent of real-world speeds. We have not done very precise tests to figure this out (we will update this post when we do), however a very close estimate would be to assume the following.
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