I know that non-reaction touch sprint, reaction sprint to small beep sound, and fly times are possible with this system.
In order to do each, is minimum requirement stopwatch+touch pad+1 junior transmitter for non-reaction sprint, stopwatch+touch pad+1 junior
or stopwatch+2 juniors for reaction sprints, and stopwatch+2 juniors for fly times?
So to do all three, it would require stopwatch+touch pad+2 juniors?
Correct. The first two methods would use the tx touch and tx junior transmitters and the third method would use two tx junior transmitters.
Also, regarding accuracy, I know that the video on Youtube says Freelap times .02s faster than photocell, but is photocell as accurate as
the FATs used in track meets?
Freelap and single beam photo cell timing systems have similar precision. Timing systems such as FinishLynx have much more precision.