This is because the IBO speeds are determined under a set of particular conditions: Then, for comparing bow speeds, you'll need tomaintain these factors constant. 550 grain arrows will fly at ~85.5% of initial speed The trick is to balance speed (and range finding forgiveness) with arrow mass and penetration potential. TenPoint today unveiled its new-for-2022 Nitro 505, the fastest crossbow in company history and one that sets a new industry standard with an advertised speed of 505 feet per second with 400-grain bolts. For every inch of draw length above 30, add 10 ft/s to the IBO value. Which leaves us with the only valid option for increasing the FPS of a crossbow: buying a faster model in the first place! Simply put, many of the best crossbows available on the market nowadays (2015) receive their speed ratings based on arrows weighing roughly 400 grain. *Initial speed = our base speed determined using a 400 grain arrow: 425 grain arrows will fly at ~97.5 of initial speed For more information on Kinetic Energy and Momentum, please see Kinetic Energy, Momentum and Arrows Enter the arrow weight (grains) Enter the arrow speed (fps) Momentum = Kinetic Energy = Archery Report Sites Archery Report Archery Calculator If youre planning on using 450 grain arrows, the information above suggests that your arrow will leave the crossbow at a speed of around 380 FPS (95% of 400). Balanced Bowhunting , which happens to be the most important factor in regard to hunting with archery equipment. With that said, the average efficiency curve utilized for the calculator is based on various bows from APA, Elite, Bowtech, Hoyt, and PSE ranging from 40lbs up to 85lbs. If this tool does not calculate, please refresh the page and try again. . Consider More Than Speed When Buying a Crossbow - TenPoint Putting it all into perspective. 600 grain arrows will fly at ~82.5% of initial speed. For every 3 grains of additional weight on the bowstring, subtract 1 fps from the IBO value. Models at the high end of this spectrum tend to cost a lot so we should be pretty confident the top velocities bring equally impressive results before spending the cash. Arrow Velocity Arrow Mass Your kinetic energy is 0 foot pounds, and your momentum is 0 slug FPS. The heavier your arrow, the slower its initial speed will be, and the lower its speed will be when it hits the target, resulting in lower kinetic energy. Every inch of draw length above 30 will add 10 feet per second to the IBO value. As of 2021, crossbow speeds range between 300 FPS and 500 FPS. But that rarely happens, and heres why. When using the calculator above, input your values and then compare them to those values in the tables below. In the calculator below, we measure this in slugs. Muley Short Sleeve T-shirt | Solids, Coues On Short Sleeve T-shirt | Black/Gray, Western Whitetail Multicam Flexfit Mesh Cap, +/- 1 inch change in draw length ~ +/-10 FPS, +/- 10 pound change in draw weight ~+/- 18 FPS, +/- 3 grain change in arrow weight ~ +/- 1 FPS, +/- 3 grain change in string weight ~ +/- 1 FPS. Spine is measured by the number of inches a shaft deflects (bends) X 1000. Arrow Speed Calculator The most critical factor is the IBO speed entered as this is the starting point of the calculations. And second, faster arrows leave less time for the animal to react to the shot sound. How far will it penetrate? Lets find out. While it is based on the bow speed IBO specification, you can input the individual settings of your bow. Compare expected FPS across over 120 crossbows and decide which one to buy. 44 Yards - Maximum Effective Hunting Range. The Best Crossbow Bolt Weight for Your Specific Hunting Crossbow Kinetic Energy: Calculations, Hunting Requirements, and Charts - Hunt Hacks Do 100 FPS make such an impactful difference? Kinetic Energy and Momentum Calculator To properly calculate arrow speed, use the following formula: IBO Speed(in fps) + (Draw Length 30) x 10 Additional Weight on Bowstring (in grains) / 3 + MIN(0, (Arrow Weight(in grains) 5 x Draw Weight in Pounds) / 3 )). Even at 275 FPS you only get close to it at 10 yards out. Fast-flying arrows have flatter flight trajectories and less deviation from the wind. draw weight, and 350-grain arrow. Arrow Speed, Kinetic Energy, and Momentum Calculator - ArcheryHunting.com Arrow Speed Calculator FOC stands for Front of Center balance point. This average will get most bows within a few percent of real-world speeds. Every 3 grains of additional weight on the bow string will subtract 1 foot per second from the IBO value. Calculating Compound Bow Kinetic Energy (KE) - Beginner's Guide But a bowling ball moving at the same speed is a whole different matter. If you're planning on using 450 grain arrows, the information above suggests that your arrow will leave the crossbow at a speed of around 380 FPS (95% of 400). Front of Center and Kinetic Energy Calculators - Gold Tip How far can you shoot a crossbow? This arrow speed calculator allows you to accurately determine the speed of an arrow. This equation assumes that your bow puts the same amount of energy into each arrow. So the important question right now is: how much does initial arrow speed drop as its weight goes up? Contact Us for More Information. Decide on the draw weight and the arrow weight. Knowing I shot my 315-grain antelope arrow at 309 FPS, I entered that data to find the most efficient arrow weight for my new whitetail arrow. Arrow speed Value must be between 100 and 500 Feet Per Second. By simply indicating the particular values of some parameters, this tool will help you calculate an arrow fps speed. Power stroke is the length between the crossbow's string in its full-draw position and at rest point. The most critical factor is the IBO speed entered as this is the starting point of the calculations. If it doesn't, adjust your 50-yard pin until it centers on the 50-yard bullseye when you're at full draw. If you try to do all of these calculations by hand, keep in mind what units you actually use! Draw weight: The more draw weight you pull, the faster the arrow will fly. This calculator is based on average efficiency gains as arrow weight is increased from 5 grains per pound (IBO). Momentum is often considered more important for hunting because it can help the arrow maintain its penetration potential. It will give you a rough idea of how fast an arrow travels after changing the bow from the recommended specifications. In general, all three methods can be used with equal success as there is little difference in measured speed. How to determine the optimal shooting range for my crossbow? 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. The rule of thumb was that for every added inch of draw length, you increase raw arrow speed by approximately 10-15 fps. Similar in design, the 35 3/4-inch-long Horton Storm RDX attains 370 fps from a 16 1/2-inch power stroke and 165-pound draw weight. 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). It will give you a rough idea of how fast an arrow travels after changing the bow from the recommended specifications. , because of the higher momentum at the moment of impact. Granted, this is not as accurate as a chronograph, but it'll give you an idea. there is very little difference in trajectory when you sight in at the recommended distance that is supplied with most crossbows. As such we decided to use 400 grain arrows, as this was bound to yield results most closely resembling those that a new crossbow buyer will experience when shooting the arrows in their crossbow package. When an arrow is shot from your bow, its impact, and ability to penetrate and make the kill is based not just on the speed of your bow. 450 grain arrows will fly at ~95% of initial speed The table below provides us with a general idea of how much momentum is needed for different types of wild game and it also shows us the arrows penetration capability when coupled with KE. High Velocity; 325 - 375 feet per second arrow speed crossbows. Without a subpoena, voluntary compliance on the part of your Internet Service Provider, or additional records from a third party, information stored or retrieved for this purpose alone cannot usually be used to identify you. In closing, using an arrow speed calculator will provide a solid estimate; however, you have to shoot your hunting weight arrow through a chronograph to know exactly how fast it is flying. This arrow speed calculator allows you to accurately determine the speed of an arrow. Values below should be considered very close estimates of what you will experience in the field (a 2% margin of error should be assumed). As such we recommend that elk hunters stick to 300 FPS or more. You can go to heavy with an arrow, but the answer is not as simple as that. #2: Even a 50 FPS speed difference alters kinetic energy significantly. Here are the results of a research that compared the effect of a deer jumping the string when shot using bows with different speeds at different distances: For instance, we can see that at 30 yards, a shot deer would drop about 6 inches before an arrow reaches it, if said arrow travels at 258 FPS. Using the calculator above, you can see how changing even the smallest things can affect the lethality of your hunting arrows. ArcheryCalc - Backcountry Bowhunting