Principles of using an archery calculator For every inch of draw length that is less than 30 inches, deduct 10 feet per second from the IBO value. 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.
In archery, how do you compute the speed of your arrow?
- All of these laws may be summarized in a single equation, which is: v = IBO + (L – 30) * 10 – W / 3 + min (0, -(A – 5D)/3) v = IBO + (L – 30) * 10 – W / 3 + min (0, -(A – 5D)/3) where: v represents the real arrow speed in feet per second, IBO represents the arrow speed according to the IBO specification in feet per second, L represents the draw length in inches, W represents the added weight on the bow string in grains, and
How many fps does a 70lb 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 many FPS is a 40 pound bow?
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 many FPS do you gain per pound of draw weight?
Per pound increase or decrease in draw weight, you will gain or lose on average 2.4 frames per second. If you go lower, you will lose, and if you go higher, you will win.
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.
Is 300 fps good for a compound bow?
Anything in the 250-300 frames per second range is ideal. I feel that if you are quicker than 300fps, you can sacrifice part of your speed for a heavier (more efficient and forgiving) arrow (at least for most archers). If your arrow is moving slower than 250fps, use a lighter arrow for a better trajectory.
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 far can a 20 lb bow shoot?
If you’re referring to a recurve bow, this is considered beginning level skill. If you wish to practice target shooting, a reasonable distance is 20 yards, and a maximum distance of 30 yards would be appropriate for typical sights. You could theoretically hit 40–50 yards with a bare bow and no attempt at sighting.
What is the right bow size for me?
If you’re shooting with a draw length greater than 29 inches, a 70-inch bow is advised. If you shoot with a draw length greater than 27 inches, it’s a 68-inch bow. If you shoot with a draw length greater than 25 inches, it is a 66-inch bow. If you shoot a bow that is shorter than 25 inches in length, you should consider a 64-inch bow (with short limbs and a 23-inch riser).
How many FPS is a grain of arrow?
For every inch of draw length that is less than 30 inches, deduct 10 frames per second. Every inch over 30 inches increases the frame rate by ten frames per second. For every 3 grains of total arrow weight over 5 grains per pound of draw weight that exceeds 5 grains per pound of draw weight, remove 1 foot per second. For every three grains of weight on the bowstring, remove one foot per second from the maximum speed.
How far will a bow shoot?
The greatest range of a bow is around 200 to 500 yards, but the effective, accurate range for target shooting is 150 yards to 350 yards, depending on the type of bow and draw weight used in the shooting. When hunting with most bow types, the maximum hunting range is 30 to 60 yards for expert hunters and 15 to 25 yards for beginners.
How does arrow weight affect arrow speed?
Depending on the bow type and draw weight, the greatest range of a bow is around 200 to 500 yards, while the effective, accurate range for target shooting is 150 yards to 350 yards, on average. 3 The maximum hunting range for most bow types for expert hunters is 30 to 60 yards, whereas it is 15 to 25 yards for beginners.
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.
Is a 60 lb bow enough for elk?
60 pounds is great; you’re on the correct track in terms of arrow weight, at least for now. He’ll be zipping through vitals if you give him a powerful, razor-sharp fixed blade that can fly like a laser.
What is the fastest bow?
Epic Blackout is a film about a blackout in a city. The Blackout Epic is a high-performance compound bow with a peak speed of 340 feet per second.