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I am doing this for my science fair project, and I am soooo confused! what in the world is 'sight mark setting' and 'eye to sight pin'??????I am only trying to find an easy way to find out how fast the arrow went... I'm not in any club and I can shot when I can- which is not very much.
It also includes compensation for aerodynamic drag. Dick Baugh 10/06/08 : Comparison with Accurate Sights software: Matched at 20 and 70 yards.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.JTC 26/09/09 : As an Engineer by trade, I can see how this method of calculating speed would work. for those of us who use the English system some nice converstion calculators to convert to metric.If you're interested, contact me : bestel (at) ifrance (dot) com john r 26/07/07 : i used your speed chart and checked it against many of the known sight marks that i have and it was accurate for all of them.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.