crossbow fps calculator

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 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. Plan. Bowstring weight WWW Adding accessories to a bowstring impacts its speed; for every 3 grains of extra weight on the bowstring, deduct 1 fps from the IBO number. If you open any online store that is selling them, you'd see that the speed of the arrows (measured in FPS or feet per second) that are launched by each listed model is their most prominent feature. And this is a bigger problem than you may think at the moment. FOC stands for Front of Center balance point. Four terms to know when properly sighting in a Crossbow. The chart below, and the research conducted is copyrighted material and is the property of BestCrossbowSource. You can also see how increasing your arrow weight will increase kinetic energy and momentum, but then decrease kinetic energy when the speed of your arrow decreases to the point where it can no longer provide the force necessary to increase your arrows lethality. FPS calculators (Frame per Second) work by using large databases of FPS records for various processors and graphic cards. 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. Total string accessory weights in grains (peep, tube, silencers, etc.). Let us see how to use this tool: Begin by indicating the IBO rating in fps in the Bow IBO rating field. This arrow speed calculator allows you to accurately determine the speed of an arrow. Meaning that we can increase the speed by simply using a lighter shaft or broadhead, but that would actually reduce the penetration potential of the arrow because momentum is mostly affected by the weight of the projectile. Here are a few rules of thumb to remember: The Kinetic Energy and Momentum Calculators here use the gravitational constant to give you the best results for kinetic energy and momentum. A 10 ft-lbs difference in KE can potentially result in a noticeable difference in the arrows ability to effectively penetrate the animal and cause a humane kill. Using multiple chronographs positioned at varying distances and heights, we calculated the drop in projectile speed at 10, 20, 30, 40 and 50 yards. Let's consider the following example: you are analyzing the bow of IBO 300. there is very little difference in trajectory when you sight in at the recommended distance that is supplied with most crossbows. It will give you a rough idea of how fast an arrow travels after changing the bow from the recommended specifications. It will give you a rough idea of how fast an arrow travels after changing the bow from the recommended specifications. For every inch you reduce, the draw length reduces around 10 fps of your bow speed. This measurement results from the relative weights of the components used in the arrow: shaft, insert, point, fletching and nock. At the rated 350 fps IBO the speed should be 319 so we know that the IBO is slightly high. For example, if you increase the draw weight by 5 pounds the speed of your arrows can increase by 10 fps. The rule of thumb is that for every 10 lbs. The crossbow community has been obsessed with velocity ever since the resurgence of the crossbow as a viable weapon for hunting. A fast arrow has the flattest trajectory possible, and thats a good thing, for several reasons, the biggest being the leeway in aiming at a distant target at an unknown range. For every inch of draw length under 30, subtract 10 ft/s from the IBO value. Copyright 2023 The Everyday Bow Hunter. Simply put, many of the best crossbows available on the market nowadays (2015) receive their speed ratings based on arrows weighing roughly 400 grain. Lets find out. When you pull the trigger most of that PE is transferred to the arrow and converted to kinetic energy (KE), which propels it downrange. They see a bows IBO speed rating listed, and assume they will get that raw arrow speed, or maybe a little better if they buy that bow. Spine is measured by the number of inches a shaft deflects (bends) X 1000. 36 Yards - Maximum Point Blank Hunting Range. Generally speaking, adding 20 grains of overall weight to the string will only deduct about 5 fps off the raw arrow speed. Kinetic Energy & Momentum Calculator Find out the kinetic energy of your arrow or bolt using the following simple calculator. 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. A 70#/29 bow thats rated at 350 fps is has been chronographed at 315 fps with a 400 grain arrow. 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 )). 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. You can assume, roughly, that an arrows kinetic energy is reduced by around 3-4% for every 10 yards it travels. The heavier the arrow is, the faster gravity will pull it toward the ground, but arrows or bolts do not have an even weight throughout. The size of the heart/lung area is around 8 inches on a average size deer weighing 120 pounds. 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. arrow weight can seriously affect the speed, Arrow Speed, Kinetic Energy, and Momentum (Penetration) Calculator, Draw Length Calculator: Get Accurate Results Fast, Arrow FOC Calculator: Measure & Calculate FOC Fast, How to Buy Arrows for a Compound Bow (The Right Way), Arrow Weight Calculator: Optimize Your Arrows for Hunting, Understanding Arrow Spine and Spine Deflection for Hunting, Large Game (elk, black bear, wild boar, etc. 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. Thus these values of speed, momentum, and kinetic energy, are only valid within a specific distance range. As you might expect, a heavier arrow flies slower than a smaller and lighter one. The IBO method (detailed in the arrow speed calculator instructions above) sets up a bow and an arrow weighing 5 grains per lb. 3. Please keep in mind that the values below assume the crossbow configuration is not altered, and that the only change is in arrow weight. The overall weight of the weapon, its balance, arrow weight, ease of cocking, and precision are also important. 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. . Mike is an avid archery hunter and brings a military methodology to his hunting and life. 550 grain arrows will fly at ~85.5% of initial speed Which results in easier aiming and thus, in improved precision. Not too long after that came the advent of the speed bow, and soon, almost every bow on the market was capable of hurling anarrowat 300 fps. Every 3 grains of total arrow weight above draw weight multiplied by 5, will subtract 1 foot per second from the IBO value. Enter speed and arrow weight data into the calculator. Bows 5-10 years old will tend to gain efficiency faster than one that is brand new. 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. Mine hits dead nuts from 30 out to 135 yards. , because of the higher momentum at the moment of impact. Every inch of draw length above 30 will add 10 feet per second to the IBO value. At the time lets call it the Round Cam Epoch the chase was for 200 fps. 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. When you properly sight-in your crossbow for hunting you want to have a flat trajectory, the flatter the better. Corrected IBO Example - A 70#/29" bow that's rated at 350 fps is has been chronographed at 315 fps with a 400 grain arrow. 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. This is what we included: The IBO speed is used as a standardized speed rating for bows. There are a few more things that impact how fast your arrow is traveling after you shoot. Chasing 300 fps? How far can you shoot a crossbow? Decide on the draw weight and the arrow weight. Generally bows will put slightly more energy into heavier arrows, so the actual speed you get with a heavier arrow will probably be a little higher than this formula calculates. Notice that at 250 FPS this value cannot be achieved. If you were to shoot a 600 grain arrow instead, your initial speed would be roughly 82.5% of 350, or around 290 FPS. The arrow weight in grains (includes fletchings, wraps, inserts and also. Thus, when a manufacturer touts its bow as having a speed of, say, 350 fps, the truth is that a hunting weight arrow of 400-450 grains from that same bow will initially leave the bow much slower especially if the draw weight and draw length are significantly reduced. 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. When you input your bow and arrows information in the calculator below, you can see right away what your arrows potential is. When shooting a compound bow, all things being equal, they are: Many bowhunters dont quite understand the complexity behind bow speeds. ), Any additional weight on your bowstring (nock loop, peep, etc.). The arrow ballistics calculator below will help you determine your arrows vertical drop, speed, kinetic energy and momentum, for up to 70 yards out in 10 yard increments. The technical storage or access that is used exclusively for statistical purposes. A lighter arrow produces more arrow speed, but an increase in arrow weight (incremented by 25 grains) can increase and eventually decrease arrow kinetic energy. My bow stayed the same: 60-pounds at 27.5-inches of draw. The most critical factor is the IBO speed entered as this is the starting point of the calculations. A longer draw length results in a longer power stroke than a shorter draw length, allowing the bow to store more energy that then is transferred to the arrow. As such we recommend that elk hunters stick to 300 FPS or more. The most critical factor is the IBO speed entered as this is the starting point of the calculations. 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. In arrow flight, trajectory refers to the exact arcing path the arrow travels from the crossbow to the target downrange, as soon as the arrow leaves the power of the bowstring it is subjected to atmosheric drag (slowing it down) and gravity (pulling the arrow down to earth). For whitetail deer this requirement is lower any crossbow 250 FPS and up will be a safe pick. 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. A heavy arrow will produce a great deal of arrow momentum even at the price of arrow speed, but will eventually go down as arrow speed decreases. The arrow ballistics calculator below will help you determine your arrow's vertical drop, speed, kinetic energy and momentum, for up to 70 yards out in 10 yard increments. The most critical factor is the IBO speed entered as this is the starting point of the calculations. As a general rule, with every 10 pound increase in draw weight, arrow speed rises by around 20 fps. Crossbow Kinetic Energy Chart, Calculations, Hunting Requirements, Compare expected FPS across over 120 crossbows, Arrow Ballistics Calculator Kinetic Energy, Drop, Speed, Momentum, Crossbow Arrow Drop Charted Test Results, Best Hunting Crossbow For The Money in 2020. 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. For your reference, an estimated peep only weight is 20 grains, and a peep + tube is 45 total grains. To properly calculate kinetic energy, use the following formula: 1/2 Mass (Arrow Weight in grains divided by 2) x Velocity squared (Arrow Speed x Arrow Speed (in fps from the above formula)) / 225218 - The result of this formula is calculated in foot-pounds (ft-lbs). Draw length LLL This is the distance that the string is pulled back. If you change the values on your draw weight, draw length, and arrow weight; you will see how these changes impact your arrow speed, kinetic energy, and momentum. High Velocity; 325 - 375 feet per second arrow speed crossbows. Now we have what we need to calculate KE: Arrow speed: 240 FPS Arrow weight: 400 grain The formula for calculating Kinetic Energy is: (Arrow weight) x (Arrow speed) x (Arrow speed) / 450,240 Power stroke is the distance, in inches, that the string accelerates an arrow down a crossbow's flight rail. High Velocity Crossbows. Arrow Ballistics Calculator Kinetic Energy, Drop, Speed, Momentum, Crossbow Kinetic Energy Chart, Calculations, Hunting Requirements, Crossbow Arrow Drop Charted Test Results. In the calculator below, we measure this in slugs. 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). 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. 525 grain arrows will fly at ~87.8% of initial speed For example, a bow designated as IBO 330 could achieve greater speeds than a bow rated as IBO 300. of draw weight your bow is reduced, raw arrow speed is reduced 15-20 fps. Execute. 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? Created by the International Bowhunter's Organization, the IBO speed is given as a speed value in feet per second (fps or ft/s), and the higher this number is, the higher the speed that could be achieved with that particular bow. All Rights Reserved. The same is true of a crossbow arrow. Use the Arrow Efficiency Calculator to find the optimal arrow for your bowhunting setup. Reduce the IBO speed until the calculator shows the verified speed of 315; in this case, the correct IBO value would be 346 fps. But that rarely happens, and heres why. Given enough time, deer would duck in preparation for a big jump. We strongly advise that you stick with the recommended values to maintain lots of room for error, particularly if youre new to hunting. The arrow speed calculator makes it easy to estimate the speed of an arrow! The rule of thumb was that for every added inch of draw length, you increase raw arrow speed by approximately 10-15 fps. To correctly calculate kinetic energy, use the following formula: 1/2 Mass (Arrow Weight in grains divided by 2) x Velocity squared (Arrow Speed x Arrow Speed (in fps from the above formula)) / 225218 The result of this formula is calculated in foot-pounds (ft-lbs). Let us see how to use this tool: Begin by indicating the IBO rating in fps in the Bow IBO rating field. Now, enter the Draw length of the bow. Archery Hunting 101: Bow Hunting for Beginners. This tool should get you close to that. For every 3 grains of total arrow weight above draw weight multiplied by 5, subtract 1 fps from the IBO value. How to determine the optimal shooting range for my crossbow? Keep reading to learn how to use our calculator and how to optimize your arrow for your hunting needs. Be careful with increasing string weight, as it is equally important to string the bow comfortably. Contact Us for More Information. And the greater the mass, the longer the energy stays in the arrow as it flies. While it is based on the bow speed IBO specification, you can input the individual settings of your bow. 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. Crossbow Kinetic Energy 200 FPS 225 FPS 250 FPS 1/3 10 20 30 40 50 0 25 50 75 100 125 150 Yards travelled by arrow Kinetic Energy ( In food - pounds) Chart by Visualizer To exaggerate to make a point, a one-pound arrow would plummet to the ground the minute it left your barrel. The Doppler chronograph is fast and easy to use. Light Blue: Range of efficient arrow weights. Copyright 2023 | DRCMedia LLC | All Rights Reserved, Scout. Power stroke is the length between the crossbow's string in its full-draw position and at rest point. While there are other factors to consider when setting up a compound bow for hunting, all bowhunters want to shoot as fast an arrow as they can with their bow setup. This calculator is based on average efficiency gains as arrow weight is increased from 5 grains per pound (IBO). Two main ways in which speed affects precision: First, faster arrows have flatter trajectory, meaning they drop less as they fly toward their target. And second, faster arrows leave less time for the animal to react to the shot sound. The arrow speed calculator above provides a quick estimation. Bows 5-10 years old will tend to gain efficiency faster than one that is brand new. Every bow gains efficiency a little differently. Granted, this is not as accurate as a chronograph, but it'll give you an idea. You can use the results obtained from this archery calculator in the projectile motion calculator to analyze the arrow's path. There are several factors that go into the arrow speed equation. For every inch of draw length above 30, add 10 ft/s to the IBO value. Corrected IBO Example - A 70#/29" bow that's rated at 350 fps is has been chronographed at 315 fps with . This average will get most bowswithin a few percent of real-world speeds. What is the maximum range for a crossbow? For the most accurate results, it is best to use a known speed and known arrow weight under 6 grain per pound to determine your corrected IBO value. When it comes to how much an arrow's weight affects its speed, the consensus is that every additional 5 grains of arrow weight reduces arrow speed by an average of 2 fps. 1. For example, it takes approximately 40 ft/lbs(+or-) of kinetic energy to kill a whitetail deer. Bow/Arrow Speed Calculator (Estimate from IBO/ATA) This calculator will estimate the speed of the bow/arrow based on the speed rating of the manufacturer and individual setup of the bow. And remember, in bowhunting speed is good but it is far from everything. To properly calculate momentum, use the following formula: Mass (Arrow Weight in grains) x Velocity (Arrow Speed (in fps)) / 225218 The result of this formula is calculated in slugs. Keep in mind that most IBO ratings are not real-world numbers. If you look at the above chart you will notice that from 250 F.P.S. Three main factors determine how fast a crossbow will shoot: power stroke, draw weight and arrow weight. You are welcome to share it, as long as you mention www.bestcrossbowsource.com as the original source of the data / research. Arrow speed depends on several factors, including bow string weight, string length, string material, arrow weight, and weather conditions. The results suggested a weight between 400- and 428-grains. *All data are approximate. Whitetail deer is particularly proficient at doing that. For every 3 grains of total arrow weight above draw weight multiplied by 5, subtract 1 ft/s from the IBO value.

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