Originally Posted by popdelusions
Not sure if anyone's mentioned it before but there's an interesting mathematical model of the flying 200 at analyticcycling.com; probably worth checking out if you REALLY want to plan your drop down point and trajectory.
It's not as useful as being at the track and trying a few 200's and talking to people who are familiar with the lines on the track. The line chosen on a particular track can also vary slightly based on the rider's abilities.
At Hellyer, I use 49x14 if I'm aiming around 12 seconds, and 50x14 for 11.8 or better. Some other guys use smaller gears and higher cadences than I do.
For Zapp, since you're trying a similar gear you'll probably want to either use a long approach acceleration since I doubt you have the strength to get on top of that gear with a shortish jump, or try a smaller gear like 47x14 and get to somewhere near 125 rpm's, until you get better at spinning.