The Spine number in the intersecting cell is the required Spine for your set-up. The most accurate numbers will be achieved when using the exact speed of the arrow, found by averaging multiple shots through a chronograph. My bow stayed the same: 60-pounds at 27.5-inches of draw. Total arrow weight with 100 grain head is 430 grains. This will give you insight into the penetration power of your rig. Enter the bow's peak weight. Manufacturers provide details about the arrow’s GPI on their website and product packaging.Using GPI calculations, a light shaft weighs 5 to 6 grains per inch, a … This calculator will estimate the speed of the bow/arrow based on the speed rating of the manufacturer and individual setup of the bow. Arrows: Speed and Distance This chart shows an arrow traveling 270 f.p.s. At the rated 350 fps IBO the speed should be 319 so we know that the IBO is slightly high. While it is based on the bow speed IBO specification, you can input your individual setting of the bow. You are 100% confident an existing bow and arrow setup is consistently on target from group tuning, but when using this calculator to confirm your setup, the bow and arrow results have a variance of greater than 2 lbs. Example - A 70#/29" bow that's rated at 350 fps is has been chronographed at 315 fps with a 400 grain arrow. Arrow Ballistics Calculator. Bow efficiency was calculated based on 1 foot per second arrow speed deducted for every 5 grains of arrow weight added. Reduce the IBO speed until the calculator shows the verified speed of 315; in this case the correct IBO value would be 346 fps, Black Eagle Carnivore Bare Shaft - Factory Components, Black Eagle Carnivore Bare Shaft - Ethics Components, Black Eagle Rampage Bare Shaft - Factory Components, Black Eagle Rampage Bare Shaft - Ethics Components, Black Eagle Carnivore Fletched - Factory Components, Black Eagle Carnivore Fletched - Ethics Components, Black Eagle Rampage Fletched - Factory Components, Black Eagle Outlaw Feathers - Ethics Components, Black Eagle Rampage Fletched - Ethics Components, Black Eagle Outlaw Feathers - Factory Components, Bohning/Gateway Components - Nocks, Wraps, Vanes, Feathers, Ethics Components - Inserts, Halfouts, Outserts. We are committed to maintaining our reputation as the leader in innovative Reduce the IBO speed until the calculator shows the verified speed of 315; in this case the correct IBO value would be 346 fps Adding 50 grains more to arrow weight actually reduces KE slightly due to velocity loss, while momentum continues to improve by about 5%. Most IBO ratings are not real world numbers. If your bow cannot be located in the drop down menu then skip to the next step where you can enter your information by hand. For the most accurate results it is best to use a known speed and arrow weight under 6 grain per pound to fine tune where your base IBO should be. Buy online and choose from a range of Digital SLR Cameras, free delivery on orders over 50 pounds. Never better than 100fps slower than typical compound setups, from what I have heard, and generally quite a bit slower than that. 1999 Cabelas 3-D shooter of the year, mens fingers. What is trajectory. Step 11. This is the distance needed for the calculation. This app includes a database of bow specs, calculators, archery knot tutorials, installation and tuning tutorials, arrow building tutorials and more. That’s 75 grain over the IBO arrow weight, which reduces FPS by an estimated 22 FPS. Arrow Speed Calculator: Calculate arrow speed based on IBO standards: 30-Inch Draw Length, 70-Pound Draw Weight, 350-Grain Arrow. (2) If the exact speed is not available, use the Bow/Arrow Speed Calculator to estimate the arrow speed. I've checked out the Pete Ward and Bow Jackson versions, however both show a 6" drop from 10 to 20 yards, and I know that's not accurate. Velocity estimate assumes equal kinetic energy for each arrow weight. You can make sight tapes, select arrows perfectly matched to your bow, calculate and view ballistic charts and all data including wind, angular shots and point of impact data. For calculating arrow speed from bow specifications and draw weight you will need technical data available for your bow from tests done in the various archery magazines. For more information on Kinetic Energy and Momentum, please see Kinetic Energy, Momentum and Arrows I set this calculator up assuming a standard peep. Even several major arrow manufacturers have KE calculators and recommendations for big game hunting. Arrow weight is in grains Velocity in feet per second Draw weight in pounds Zero Distance in yards up to 40 Trajectory is inches from line of sight All fields must be entered Momentum units are not standard n-s Divide by 32 for standard. An arrow’s GPI determines the arrow shaft’s weight. draw weight, 350 grain arrow) will affect the speed. Look at it this way: would it be easier to stop a finishing nail at 400 fps or a railroad spike at 300 fps? That was the main goal of this project. For every extra 5 grain of arrow weight, expect the speed of your bow to be reduced by around 1.5 FPS. I created an average efficiency curve based off of bows from APA, Elite, Bowtech, Hoyt, and PSE ranging from 40lbs up to 85lbs. Use the Arrow Efficiency Calculator to find the optimal arrow for your bowhunting setup. In sight tapes archery calculater click on button Add new sight tape and follow the wizard; Print more sight tapes with speed step 0.5 fps; Next activities: Attach tape to sight and set pin for 20m, goto 70m and see where pin is; If above 70m sight tape mark attach faster tape (+0.5 fps), below 70m sight tape mark attach slower tape (-0.5 fps) Fps calculator archery Fps calculator archery. That will change the dynamic bow spine to be within 2 lbs. The most critical factor is the IBO speed entered as this is the starting point of the calculations. Example - A 70#/29" bow that's rated at 350 fps is has been chronographed at 315 fps with a 400 grain arrow. If your peep is significantly heavier than normal or you have a bunch of other stuff on your string then that will be causing your base rating to decrease.Also, every bow gains efficiency a little differently. Adding another 50 grains of arrow weight boosts KE only slightly, but momentum increases by an additional 6%, while the velocity slows another 5% to 257 fps. Performance: A hunting setup that pushes light (6.5-8 gpi) arrows beyond the 290 fps mark. Center point indicated by the 180 at bottom/center of the graph. This average will get most bows fairly close but if your bow is on the far end of the efficiency spectrum then it will be off a bit.The upside is that even if it's off due to this the numbers should be much closer than any of the other calculators out there. Fps 2 X Weight of Arrow / 450,240 = Arrow’s Kinetic Energy. Here’s an example of determining the kinetic energy of a bow shooting a 400 grain arrow with a 100 grain broadhead at 250 fps: KE= 250 2 x 500 / 450,240. The results suggested a weight between 400- and 428-grains. This calculator is based on average efficiency gains as arrow weight is increased from 5 grains per pound (IBO). I'm currently shooting 30" Axis 340 shafts, plain black at 9.5 grains per inch. of the dynamic arrow spine. There are over 40 videos and easy to follow text. Each bow represents the newest innovation and the current flagship bow of several top manufacturers. Keep mathematical order of operations in mind and square fps first: KE= 62,500 X 500 / 450,240 The Archery Program's (TAP's) ballistic engine has been tested and proven by some of the best Archers in the world! Though the exact feet per second (FPS) for each bow is often a variable, depending on a ton of factors, the bows are judged off of manufacturer specification capability ratings. Speed is 295 fps. Use Medium Cam Column for speeds less than 330 fps (Advertised IBO Rating). For the best shooting performance, you should make an attempt to … 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 hand-drawn, hand-held and handreleased bow and arrow is a low velocity, high-trajectory, short-range system. The worse the bows efficiency at IBO the more growth it will see as arrow weight increases. It depends on the limb weight, limb material, limb geometry, arrows, string, etc. 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. Archers can use this calculator to get an approximate idea of how changing the bow from IBO/ATA specifications (30″ draw length, 70 lb. 600gr / 10gpp arrow weight is the center point of the chart. Take your tuning and accuracy to the next level with the Bow Shop Bible! Give our locally owned business a call for more information. You will need to provide total arrow weight and initial speed for the calculation to be effective, as well as … Every precision arrow we sell undergoes the most rigorous quality control processes to ensure maximum performance and reliability. Track archery events, share results from practice and competitions, and add a social aspect for the global archery community Full Arrow Length (inches) Distance from nock end of the arrow to balance point of your arrow (inches) Arrow FOC 0 % Use the straight-line distance to the target. Bow Shop Bible. At the rated 350 fps IBO the speed should be 319 so we know that the IBO is slightly high. Follow row until you arrive at the column with the arrow’s carbon length. The Bow Shop Bible is now available on the Apple App Store! How to Calculate FOC The Front of Center percentage is the amount of forward weight on your arrow. IBO speed tests are conducted using 350 grain arrows, however most people will be hunting using arrows weighing a minimum of 425 grain. compared to the speed of projectiles of other hunting methods. Crossbow Arrow & Bolts, Trajectories. This arrow speed calculator allows you to accurately determine the speed of an arrow. - The Carbon Arrow Experts - Victory Archery offers exceptional archery products for hunters and target shooters alike. Grains per inch is the industry standard for measuring arrow weights. Once you know the feet per second (FPS) of your arrow, and its total weight (including a broadhead), then you can calculate your bow’s kinetic energy output. The Importance of Arrow Efficiency | Chasing 300 FPS for the Little Guy “The bow market is constantly changing, and lately bow manufacturers have designed bows specifically for women and bowhunters with shorter draw-lengths. Despite the rise in popularity of crossbow hunting and an increase in the number of hunting crossbows available in the marketplace, a lot of confusion still exists about crossbow speeds, crossbow arrow weights, and how to choose the best crossbow arrow weight for hunting crossbows.. A reader recently submitted this GREAT question: “Every crossbow has different draw weights/FPS ratings. The need for speed becomes most pointed in any open setting where long shots and / or nervous animals with small vitals are unforgiving of ranging mistakes. To make the change in arrow, I went back to our Arrow Efficiency Calculator. We are conveniently located at 7545 E 34th Road in Cadillac, MI. Speed is a good thing on any animal, provided your arrow is up to the task. It includes the arrow’s length, diameter, wall thickness and shaft material. Now that you’ve selected your bow information,you will now enter the “Bow Details.” On this page you will enter a few more pieces of vital information. 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