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.
What is an IBO bow, and how does it work?
- The International Bowhunters Organization (IBO) is an acronym that stands for International Bowhunters Organization. According to the International Bowhunters Organization, a standard for bows has been established, which is developed through a testing process. 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.
What is an IBO arrow?
IBO represents the arrow speed according to the IBO specification in feet per second, L represents the draw length in inches, W represents the extra weight on the bow string in grains, and A represents the arrow weight in grains. The draw weight, denoted by the letter D, is in pounds.
How is IBO calculated?
For example, the IBO speed of a bow is computed using a bow with a draw weight of 70 pounds and an overall length of 30 inches, as well as an arrow weight of five grains per pound of draw weight. A 70-pound draw weight would be firing an arrow weighing 350 grains (70 divided by 5 equals 350 grains).
What draw length is Ibo?
The IBO speed that is marketed for bows is tested at a 30″ draw length; therefore, if the draw length is reduced, the bow will lose speed; conversely, if the draw length is increased, the bow will gain speed. However, it is critical that shooters choose the draw length that is most comfortable for them rather than attempting to shoot at a larger draw length in order to obtain more speed.
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 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 fast does a 40 lb bow shoot?
The nock is attached to the string, and when the string is released, the 40 lbs are released. With each forward thrust of the string, energy is transferred to the arrow, which is now traveling at a speed of around 250 to 300 feet per second (240+ feet per second).
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.
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.
Can you dodge an arrow?
Absolutely. When shooting from a medium or long distance, you may time your dodge manuever to coincide with the instant the arrow is fired. However, unless you are Keanu Reeves in the Matrix, it is quite difficult to avoid it in the short range of a bullet.
Is 70 lb draw too much?
The holding weight of an archery bow with a peak weight of 70 pounds and a let-off of 80 percent, for example, should be around 14 pounds. A bow at full draw for 30 seconds is impressive, but if you’re shaking, straining, and weary at the end of that time, you won’t be able to make a legal shot in most situations.
How do I know my draw weight?
The criterion for determining their draw weight is 28 inches of draw length, which is regarded as the starting point. Typically, the bottom limb of the bow is marked with the pound symbol (#), such as 35# @ 28″ for a 28″ draw weight. When you have a 28-inch draw length, it amounts to 35 pounds of draw weight.
What is a Solocam bow?
Unlike a twin-cam bow, which has two symmetrical wheels, a Solocam bow has only one power cam and one idler wheel, which is normally on the bottom. When using a recurve or conventional bow that does not have cams, it is difficult to keep the bow at its full draw. It is necessary to consistently draw the entire weight of the bowstring.
Are Heavier arrows more accurate?
Heavy arrows simply absorb more of the available energy from a bow, resulting in fewer vibrations and quieter hunting bows as a result of the increased absorption. Heavy arrows are always more dependable and durable than lighter arrows, assuming all other things are equal.
What is AMO speed?
The AMO (archery manufacturers organization) speed rating, which is based on 9 grains per pound and 30 inches of pull at 60 pounds of weight, was the most commonly used back in the day when bows were slower and 3D wasn’t as popular.