swimmmm wrote:zyzzyva98 wrote:It's good to have an equation on your graphs to get a good estimate for obscure amounts like that...

an equation?! wtf how do u do that??

We use the equation for a ballistic trajectory, including aerodynamic drag, then we use our empirical data as a correction factor. We have a doppler wind speed indicator that, unfortunately, only gives us the average wind speed and direction between the trajectory device and the target. We are able to plug all this into a laptop to get the aiming offset and correct range setting. Of course at Nationals we shouldn't really need the windspeed (unless it is set up like last year's, with the A/C vents cycling up at the extremely low ceiling). All in all we still only get about 1-2cm accuracy at the fartest distances when it is windy. You could do all this without the math but it would require a huge number of data points to account for all the possible ranges, heights, wind speeds and wind directions. On the other hand I spoke to people at last year's nationals who said that with the A/C cycling unpredicatably in the gym where trajectory was run their accuracy went from centimeters (what they were able to get with no wind) to tens of centimeters in the gym at Augusta. You just have to decide how competitive you want to be.