[EricH]

Mighty slow for launching, the Window motors are. At least, for a pitching-machine type of launcher.

Grab the FPs, BaneBots, or AndyMark motors/gearmotors instead; those will run faster and should have enough power. If they don't, it's easy to add a second motor of the same type (or third or fourth, if you're talking the BaneBots motors).