Karl is responsible for the on-board software of the Solar Impulse, the only manned aircraft capable of “perpetual” flight. He is currently preparing the second Solar Impulse aircraft for an attempt to fly around the world in 2015. Karl is also developing all on-board software for Lange Aviation GmbH, including the world’s first certified manned aircraft with electric propulsion (Antares 20E in 2005) and the world’s first aircraft to take off with fuel cell power alone (DLR-H2 in 2009).