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Perriswood Dick 30/03/07 : I can see how the algorithm accounts for different arrow size/weight but where is limb/r1ser length and draw weight taken into account RLH Apostolos 01/04/07 : In fact, we don't care about the draw weight but only for the angle difference between the two distances. I was also thinking of doing another version that could calculate your arrow speed loss per meter given all of your sightmarks. Could you please help me figure out how to measure speed of an arrow (point blank) just with draw weight (45 lbs) and arrow weight (385 gr)?

This program can calculate your arrow speed, given two previously known sight marks.

The only thing you need to know is the distance from your eye to the sight pin. I am trying to make a ballistic module for bowhunters, like yours but take also Ballistic Coefficient, but I cannot find out how to calculate speed at differents distance. I used Mathematica to find the solution and it's a formula 4 lines long.

All the results are fairly accurate, congrats on a job well done.

paul f 08/09/10 : i have access to a speed gun would that work too kayla 10/09/10 : that is cool Li 01/10/10 : This calculator works pretty well.

Tony Bakes 15/11/09 : As a keen flight archer, this is an invaluable program for seeing what differences small changes in setup will make to the speed (and hence distance) of any bow/arrow combination without having to find a field 1000m long. Bryan 02/01/10 : Very nice, is this the formulae you used S=SQRT(9.81*x*(d1-d2)/(2*h)) where S= Speed x= distance from eye to sight d1/d2= distances h= sight adjustment Anonymus 21/01/10 : ???????? what in the world is 'sight mark setting' and 'eye to sight pin'??????

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