is a European long-range solar powered plane
project currently being undertaken at the École Polytechnique Fédérale de Lausanne
. The project is promoted by Bertrand Piccard
, who piloted the first balloon to circle the world non-stop
. This project hopes to repeat that feat using only solar power. The first aircraft, officially named HB-SIA, is a one-seater, capable of taking off under its own power, and intended to remain airborne up to 36 hours.
Building on the experience of this prototype, a slightly larger follow-on design (HB-SIB) is planned to make circumnavigation
of the globe in 20–25 days.