The IBO speed is obtained by firing a bow with a maximum pull weight of 80 pounds +/- 2 pounds and a draw weight of 80 pounds +/- 2 pounds. The weight of the arrow will be 400 grains, which is equal to 5 grains per pound of draw weight. There is no minimum draw length necessary. The measurement is obtained at the point of no return for the bowstring.
- IBO speed is evaluated by firing a 400-grain arrow with an 80-pound draw weight (+/- 2 pounds) and a maximum draw length using a bow with an 80-pound draw weight (+/- 2 pounds). Speed is measured with a 70-pound draw weight (+/-.2 pounds), a 30-inch draw length, and a 350-grain arrow for the ATA.
What is IBO speed measured at?
In order to quantify arrow speeds, the International Bowhunters Organization and the Archery Trade Association have developed precise formulae. IBO speed is evaluated by firing a 400-grain arrow with an 80-pound draw weight (+/- 2 pounds) and a maximum draw length using a bow with an 80-pound draw weight (+/- 2 pounds). The ATA speed is measured using a 70-pound draw weight (+/-) as a reference.
How is Ibo on a bow calculated?
Principles of using an archery calculator For every inch of draw length that exceeds 30 inches, the IBO value is increased by 10 feet per second. For every 3 grains of total arrow weight above draw weight multiplied by 5 that exceeds the draw weight, remove 1 foot per second from the IBO. For every three grains of additional weight on the bow string, one foot per second is subtracted from the IBO.
How do you measure the speed of a bow?
The distance between the two groups of arrows you shot from 20 and 40 yards should be measured in inches in order to compute arrow speed. Granted, this is not as exact as a chronograph, but it will give you a general sense of how long it will take. Following the acquisition of this figure, you may compute the kinetic energy generated by your bow.
How fast does a 70 lb bow shoot?
If you have a draw weight of 70 lbs., your compound bow will have a shooting speed of 270 feet per second. Furthermore, if your draw length is actually 30 inches (as it was during IBO testing), this value would be closer to 290 frames per second.
How do you measure an axle axle length on a bow?
From the center of the top axle to the center of the bottom axle, take a measurement. For the purpose of determining the axle-to-axle distance, the limb bolts are maxed out (maximum poundage tightened all the way down) and the axles are measured together. This is the distance between the axles of your vehicle.
What is ATA IBO speed?
The speed of an arrow is measured in feet per second, abbreviated as fps. Generally speaking, the greater the number, the quicker the bow is. Bows with a speed rating of 300 fps are significantly faster than bows with a speed rating of 290 fps. Bow makers indicate their speed ratings with the letters “ATA” (Archery Trade Association) or “IBO” (International Bowhunting Organization) next to them.
How much does an arrow drop at 20 yards?
#4: The further an arrow flies, the faster it drops: Using the 350 FPS crossbow as an example, you’ll notice that an arrow drops 8.5 inches between the 10 and 30 yard marks (20 yards distance), but drops another 19.8 inches over the next 20 yards (from the 30 to 50 yard mark), for a total of 28.3 inches drop over the next 20 yards.
How do I measure my draw length?
Place your back against a wall and stretch both of your arms out against the wall to determine the length of your draw length. Simply measure the distance between the ends of your middle fingers on both arms, hands, and chest. This is the length of both arms, hands, and chest. Your draw length is calculated by subtracting 15 from this measurement and dividing the result by two.
How fast does a 60 pound bow shoot?
Real-World Velocity When you combine two string silencers with a peep sight, you should expect to see a reduction in velocity of 315 to 320 fps. If you shoot with a 60-pound bow instead of a 70-pound bow, you’ll most likely land in the 300-310 fps range. To be sure, firing a 400-grain arrow will drop your speed significantly, most likely to 280-290 fps or even lower depending on the wind conditions.
Is 315 fps good for a bow?
315 Yes, like with any “weapon,” correct shot placement is critical; but, the user’s skill and/or limitations should also be taken into consideration. In terms of consistency, Ten Point is a fantastic bow, and 315 is an excellent pace for it.
How fast does a 45 lb recurve bow shoot?
The speed of my 50 lb bow when shooting with a 550 grain bow is 183 feet per second while using a fast flight string. I have been shooting with this string for years with no difficulties. A 45-pound bow would lose around 7-10 feet per second. You could make it up with a lighter arrow, if you wanted.
How fast do recurve bows shoot?
A recurve bow will often shoot arrows at a speed of 140 to 200 feet per second, whereas a compound bow would typically shoot arrows at 230 to 280 feet per second. Higher draw weight and draw length, as well as lower grain arrows, will allow you to enhance the speed of your arrows significantly.
How far can a 60 pound bow shoot?
They were small and light, and they were capable of being shot from horses. They only had a maximum draw weight of around 60 lbs, were accurate to 50 yards, and could shoot a maximum distance of 100 yards. With this in mind, 100 Indians approaching 100 English archers from 150 yards would all be killed before they passed the 20-yard line. Similarly,
What is the most powerful compound bow?
Our Top Picks for the Fastest Compound Bows
- The Xpedition MX-15 shoots 358-362 FPS, making it the fastest bow overall. The PSE Xpedite shoots 352-360 FPS, making it the smoothest draw. The PSE Bow Madness shoots 340 FPS, making it the most consistent shooter. The Blackout Epic shoots 340 FPS, making it the best all-around mid-range bow. The Bear Divergent shoots 338 FPS, making it the best youth or starter bow.