im not the greatest archer but found your formula works for me. Apostolos 03/10/07 : Archimedes: you'd better use one of the other calculator that work on principle of draw weight and arrow weight.Charles: it could be tweaked but it would require two more input variables. Roy 14/11/07 : an excellent tool but for one thing! would it be possible to produce a version with imperial input values for those of us who still live in the stone age...;-) Apostolos 21/05/08 : The calculator is back in order! It mesures it very i have some the calculation inculdes the air friction,arrow weight ext?

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It's very helpfull and so helped me to verifie my estimation of the speed of my arrows. But then thinking about the speed of most compounds (300 fps) this would make sense.

I'm not a ballistic engineer, but very curious about how you find the formula. Just to test the calculator I entered a 10cm difference between to distances - then you can see how the decceleration, gravitational and other forces start to show a non-linear relationship. Mark 25/09/09 : Robin or Locksley : The things you mention are constants for the two shots from you bow setup and your arrows. Decceleration, gravitational forces and other forces are taken into account by the formular - see my earlier comment.

Most (if not all) archery clubs have a radar device in which you place it near the target and shoot the arrow through it (from about 10 feet away / the arrow will have maximum velocity shortly after it's release). Ludek 13/08/09 : Hello, it is also good for bare bow, i tried it.

This would be the most accurate way to determine the speed for the particular setup you're using. Patrick Andresz 17/07/09 : Thank you very much for this nice programm ! Don Walker 22/09/09 : an excellent tool but for one thing! would it be possible to produce a version in Yards and diference in site marks settings in mm for old field archers Mark 25/09/09 : I didn't believe it when I looked at the numbers, as the difference between each 5M distance for time and sight markings seemed to be almost constant.

This program was meant mostly as an easy way to estimate your arrow speed.

However if you give the program first your 20m/30m sight marks and then your 70m/90m, you can find out how much speed your arrow loses at longer distances. If you fire two shots using the same pin at different distances and measure the arrow drop, you should be able to determine the speed without knowing distance to the eye, non? Dan 21/10/08 : Good calculator however it does not seem to account for decceleration and would only be the average arrow speed from distance one to distance 2, beyond distance 2 your arrow would be constantly deccelerating and thus your extrapolated sight pin settings are slightly off.

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