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pierre berube: hello
it's a very good calculator and a good idea.I am in a archery club and i gived your adress web site at my friends and i put it our web club archery Joe Tapley: Simple and pretty accurate - well done. ten out of ten for the relaxing background image. (anonymous): this is cool! have to measure the distance from eye to scope to make sure it is accurate. But I have the feeling it will. Haller - Denmark: Very interesting program. 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. Could you place a link to the formula you have used. Apostolos 22/03/07 : Thanks for your comments! The formula is too complicated to describe here. I used Mathematica to find the solution and it's a formula 4 lines long. Someday I will describe how it is done in a separate page. PS: Joe, you drift program is excellent, it's amazing how good a model of arrow flight you made. 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. That uniquely determines the speed of the arrow. Charles 15/05/07 : A very interesting program. Can it be tweaked to allow for sight marks where the distance between the eye and the sight pin changes (ie. bringing the sight in for longer distances?) Apostolos 20/05/07 : I think it could be tweaked for that but I have to find that piece of paper that I had all the equations written on.. I was also thinking of doing another version that could calculate your arrow speed loss per meter given all of your sightmarks. Archimedes 09/06/07 : Hello. 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)? I would like to find out my arrow's speed so I could figure out its foot-pounds of energy. Thank you so much. ben 17/06/07 : this formula is all well and good but what arrow weight is it going off? bestel 17/07/07 : Hi Apostolos and congratulations, great job ! I'd like to translate it in french in order to use it on my club website (it would display your translated page inside a frame). 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. THANKS.. 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. When I find some time, I will take a look at it. 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...;-) |