Sign Tally's Waiver, then speak with Rally Zapnabber to use the Zephyrium Capacitorium. Return to Tally Zapnabber at Toshley's Station.
I've been fiddling with the Zephyrium Capicitorium and I'm ready to perform another test! Do you want to help?
This next flight should be short, but fast!
Um... and although I'm sure there's no danger... I have this, uh, waiver that I'd like you to sign. It's just a formality, I assure you!
Best of luck! Talk to Rally to launch yourself, and come back to me after the experiment is over!