Solar Impulse 2
WORK IN PROGRESS Fig. 1 Non-stop, solar-powered ocean hop Lausanne, Switzerland-based Solar Impulse co-founders and Solar Impulse 2 co-pilots Bertrand Piccard and André Borschberg celebrate Borschberg’s successful landing in Hawaii (inset shows the Si2 on its approach) after his five-day flight from Nagoya, Japan. Source | Solar Impulse Solar Impulse 2: Pulse on the future Not yet through their ‘round the world flight, this superlight solar plane’s airframe-proven materials are already destined for higher callings. By Donna Dawson / Senior Writer Emeritus » For anyone fascinated by aircraft, solar power and/or compos- the Si2’s ultralight composite airframe, which could not have been ites, Solar Impulse is a familiar name. It identifies the Lausanne, built for its purpose with other materials (no metal could be as Switzerland-based company that, in 2010, launched the self- light, stiff and strong as needed) and without which, the aircraft’s named Solar Impulse 1, the world’s first piloted aircraft to fly all story could not have been written at all. night on solar power alone. At this writing, its successor, Solar Impulse 2 (Si2), is at the halfway point of the first attempted solar- Halfway around the world on thin air(frame) powered around-the-world flight, with Solar Impulse founder and For this sun-powered bird, the essential prerequisite was an chairman Bertrand Piccard alternating at its controls with CEO extremely light aerostructure. The raw material that ultimately André Borschberg. satisfied this need proved to be very thin composite tapes. The On March 9, 2015, Si2 took off from Abu Dhabi in the United airframe’s main and rear wing spars, fuselage and empennage Arab Emirates, and, in eight legs, flew to Muscat, Omar, thence were constructed from thin-ply epoxy prepregs produced by North across India — stopping at Ahmedabad and Varanassi — on to Thin Ply Technology (NTPT, Penthalaz, Switzerland).
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