Yours is 4.2 inches low at 10 yards, 8.3 inches high at 50 yards and 44.7 inches low at 80 yards relative to Accurate Sights which includes air drag and distance from eye to arrow. The aerodynamic drag is not taken into account as it impossible to do with only 4 inputs.

This is usually something around draw length sight extension but it's best if you measure it accurately. have to measure the distance from eye to scope to make sure it is accurate. Could you place a link to the formula you have used. Someday I will describe how it is done in a separate page.

It can also compute your other sight marks for FITA and other distances. have a good day pb Joe Tapley: Simple and pretty accurate - well done. PS: Joe, you drift program is excellent, it's amazing how good a model of arrow flight you made. Can it be tweaked to allow for sight marks where the distance between the eye and the sight pin changes (ie. ) 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..

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'??????

I'm not in any club and I can shot when I can- which is not very much.

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.Arrows of composed of different materials, weights, lengths and the bow being used all play a factor.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.SURFELITE 10/02/10 : i am also doing a science fare project for my freshman class. can someone post something/someway to help me fine a way to figure out the acceleration,velocity, and speed of a normal pull back tension of the bow a 45lbs.plz some one help me out this project is due next tuesday and i have nothing.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.

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