crossbow fps calculator

This is where this bow speed calculator comes in handy; it allows you to examine how the arrow will behave under a different bow setting. All of these parameters are summarized in an equation that you can use to estimate the actual arrow speed: With this archery calculator, you can also find the momentum and kinetic energy of an arrow. Thus these values of speed, momentum, and kinetic energy, are only valid within a specific distance range. 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. 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. The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network. That's a tough question to answer. Copyright 2023 | DRCMedia LLC | All Rights Reserved, Scout. As the arrow travels downrange it is constantly slowing down and dropping toward the ground, the further it travels, the faster it falls to the ground. Arrow speed specification. For every 3 grains of additional weight on the bowstring, subtract 1 fps from the IBO value. Maximum Point Blank Range; Maximum point blank range when sighting in a crossbow is the height of the mid-range rise and the arrow drop beyond true zero, both are equal in measure. *Slugs can be converted to Pound-Seconds by multiplying the result from the above formula by 32.174. If it doesn't, adjust your 50-yard pin until it centers on the 50-yard bullseye when you're at full draw. Power stroke is the distance, in inches, that the string accelerates an arrow down a crossbow's flight rail. Arrow Ballistics Calculator Kinetic Energy, Drop, Speed, Momentum, Crossbow Kinetic Energy Chart, Calculations, Hunting Requirements, Crossbow Arrow Drop Charted Test Results. When shooting a compound bow, all things being equal, they are: Many bowhunters dont quite understand the complexity behind bow speeds. Total string accessory weights in grains (peep, tube, silencers, etc.). 550 grain arrows will fly at ~85.5% of initial speed And of course, most of us operate within a more or less fixed budget and don't enjoy the idea of spending $3k-$4k on one of the latest and greatest models. Please keep in mind that the values below assume the crossbow configuration is not altered, and that the only change is in arrow weight. But because these are rarely the conditions under which every archer will be using their bow, then comes the question: what the actual speed of my arrow is? Finally, using our arrow ballistics calculator (which requires that both arrow speed and mass are known) we determined the values plotted in the chart below. - 400 F.P.S. For every 3 grains of total arrow weight above draw weight multiplied by 5, subtract 1 ft/s from the IBO value. At the rated 350 fps IBO the speed should be 319 so we know that the IBO is slightly high. The results suggested a weight between 400- and 428-grains. 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 Sighting-in your crossbow properly to compensate trajectory. Whitetail deer is particularly proficient at doing that. With the disadvantage of my short draw length of 27.5-inches and my draw weight of 60-pounds because of a bad shoulder, I decided to go with the fastest arrow within that range, something right around 400-grains. Modern crossbows typically generate speeds anywhere from 280-350 feet per second, with some models topping 400 fps. Because there is a huge difference between shooting a deer with a 300 FPS crossbow and a 400 FPS (or faster) model. This specification determines the arrow speed, provided that you keep the following parameters: If you deviate from these parameters, the arrow speed will not equal the one given by the specification. Sight compensation of trajectory. fps. What is important, is understanding how this impacts the arrow you choose to buy and use when hunting, along with the broadheads you use. Use the Arrow Efficiency Calculator to find the optimal arrow for your bowhunting setup. You can obtain this value with this formula: An arrow's kinetic energy is determined as: Keep in mind that the arrow loses speed as it travels. So let's focus on that. Many bowhunters buy arrows that fit their bow, their draw weight, and their draw length; but fail to understand the unique characteristics of each arrow and the arrows ability to penetrate and kill the wild game they are hunting. Bow Manufacturer IBO Speed (ft/sec) Draw Weight (lbs) Draw Length (inches) Arrow Weight (grains) Weight Added to String (grains) (20gr = peep only, 45gr = peep and tube) Arrow Speed 0 ft/sec 0 mph Arrow Kinetic Energy 0 ft-lbs. Your arrows kinetic energy will depend on its speed. To find the distance that your arrow will travel, you can use the projectile motion calculator. The optical chronograph is insensitive to shooting distance, but shooting errors can destroy the chronograph. At the time lets call it the Round Cam Epoch the chase was for 200 fps. Draw length: A longer draw length creates a longer power stroke than a shorter draw length, allowing the bow to store more energy. About the time I reached my fathers then age, technology changed drastically, making it possible for bow companies to achieve 300 fps with a hunting bow. The rule of thumb was that for every added inch of draw length, you increase raw arrow speed by approximately 10-15 fps. ArcheryHunting.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Arrow speed depends on several factors, including bow string weight, string length, string material, arrow weight, and weather conditions. The technical storage or access is required to create user profiles to send advertising, or to track the user on a website or across several websites for similar marketing purposes. Arrow speed is determined by your bows IBO speed (fps), your draw weight (in pounds lbs)), your draw length (in inches), the arrows total weight (in grains), and the weight of what is on the bowstring (in grains) as outlined above. In other words, how much force is required to stop an arrow? Archery Hunting 101: Bow Hunting for Beginners. Mine hits dead nuts from 30 out to 135 yards. Kinetic Energy: 5.55 foot-pounds. Draw weight: The more draw weight you pull, the faster the arrow will fly. In the majority of cases once a peep is added the speed will only be a few fps off but the ratings of some bows are significantly off. And this is a bigger problem than you may think at the moment. At the rated 350 fps IBO the speed should be 319 so we know that the IBO is slightly high. The momentum of an arrow is linked to arrow penetration. To make the change inarrow, I went back to ourArrow Efficiency Calculator. Now, there are a few bows rated at 350+ fps based on the International Bowhunting Organizations (IBO) standard. In short, you need as much FPS as possible without sacrificing the other parameters of a crossbow to values that make such trade-off unworthy. And we purposefully say "speed that could be achieved" because these marked speeds are not usually the ones that an archer can attain while using his bow with his specific setup. We've created a text where you'll find some of the basics related to IBO speed and how to calculate bow speed. 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. 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. FPS calculators (Frame per Second) work by using large databases of FPS records for various processors and graphic cards. The most critical factor is the IBO speed entered as this is the starting point of the calculations. IBO Speed (feet per second) FOC stands for Front of Center balance point. As you know, IBO speed is a standard measure of the speed of a bow, and by using it as a baseline for all calculations, our calculator can provide you with accurate and reliable results. SHORT STROKES. Enter speed and arrow weight data into the calculator. The Doppler chronograph is fast and easy to use. Values below should be considered very close estimates of what you will experience in the field (a 2% margin of error should be assumed). All Rights Reserved. High Velocity Crossbows. As an Amazon Associate we earn from qualifying purchases. Then, the more draw weight you use to pull, the quicker an arrow will fly and the more kinetic energy it will have. Mid-Range Rise; Mid-range rise when sighting in a crossbow is the highest point in the arrows trajectory between the point blank range and the true zero point. Notice that at 250 FPS this value cannot be achieved. For example, a bow designated as IBO 330 could achieve greater speeds than a bow rated as IBO 300. The technical storage or access is necessary for the legitimate purpose of storing preferences that are not requested by the subscriber or user. For every 3 grains of additional weight on the bowstring, subtract 1 ft/s from the IBO value. 15.5 300. A 70#/29 bow thats rated at 350 fps is has been chronographed at 315 fps with a 400 grain arrow. 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. Archery & Crossbow Ballistics Calculator: Initial velocity: fps m/s Arrow mass: gr g Angle of departure MOA Shaft length: in cm Shaft diameter: in mm Vane length: in cm Vane height . By simply indicating the particular values of some parameters, this tool will help you calculate an arrow fps speed. If you were to shoot a 600 grain arrow instead, your initial speed would be roughly 82.5% of 350, or around 290 FPS. Arrow drop test results Compare expected FPS across over 120 crossbows and decide which one to buy. It's measured by applying an 880-gram weight to the arrow, suspended from the center of the shaft. Here is an example to demonstrate the use of the values above: Example: lets say you know your 400 grain arrow will fly at 350 FPS. For every inch you reduce, the draw length reduces around 10 fps of your bow speed. Point Blank Range; Point blank range when sighting in a crossbow is the first point at which the line of sight intersects with the arrows path in the arrows trajectory arc. Knowing the rough speed at which your arrow will fly, you can now use our kinetic energy calculator to quickly figure out your arrow's initial kinetic energy. Factoring in the gravitational constant in both of those formulas for hunting arrows is necessary to account for the effect of gravity on the arrows motion. As the older bows were less efficient out of the box, they naturally have more room for improvement. While it is based on the bow speed IBO specification, you can input the individual settings of your bow. An arrows momentum is defined by how much force is required to stop an object. Reduce the IBO speed until the calculator shows the verified speed of 315; in this case, the correct IBO value would be 346 fps. A feather traveling at 20 mph might sting, or might not even be felt, depending upon how it strikes. 525 grain arrows will fly at ~87.8% of initial speed Another common speed rating is the ATA rating, which uses a 30-inch draw length, 70 lb. Also, make sure to check out our best crossbow rankings for a scoop on the top equipment on the market. For every 3 grains of total arrow weight above draw weight multiplied by 5, subtract 1 fps from the IBO value. 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 This calculator is based on average efficiency gains as arrow weight is increased from 5 grains per pound (IBO). 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). For example, if you increase the draw weight by 5 pounds the speed of your arrows can increase by 10 fps. Using multiple chronographs positioned at varying distances and heights, we calculated the drop in projectile speed at 10, 20, 30, 40 and 50 yards. This is what we included: The IBO speed is used as a standardized speed rating for bows. The arrow speed calculator above provides a quick estimation. But that rarely happens, and heres why. This tool should get you close to that. True Zero; True zero when sighting in a crossbow is the second point at which the line of sight intersects with the arrows path in the arrows trajectory arc. 12.8 330. Every bow gains efficiency a little differently. The rule of thumb is that for every 10 lbs. 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. The combined speed, kinetic energy, and momentum calculator below will help you estimate the potential each arrow has based on its weight and your personal bow setup and settings. Practice has proved that shooting with a faster crossbow reduces or entirely eliminates the probability of this. And your arrow would fly over it or hit a less desirable area, like the spine of the animal.
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