Paul MacCready conduting a flutter test of Solar Challenger's tail section.
The solar-powered Solar Challenger in flight.
Paul MacCready, designer of the human-powered Gossamer Albatross.
PHOTO: STERLING STOLL
Pilot Janice Brown lifting off with Solar Challenger.
Colorado aviator Stephen Ptacek got MacCready's go-ahead to pilot the Solar Challenger for the France-to-England flight.