Solar Impulse

Solar Impulse
Solar Impulse 1 landing at Brussels Airport after its first international flight on 13 May 2011.
Role Experimental solar-powered aircraft
National origin Switzerland
Manufacturer Solar Impulse
First flight 3 December 2009
Primary user André Borschberg and Bertrand Piccard
Produced 2009–present
Number built 2 (including prototype)

Solar Impulse is a Swiss long-range experimental solar-powered aircraft project, and also the name of the project's two operational aircraft.[1] The privately financed project is led by Swiss engineer and businessman André Borschberg and Swiss psychiatrist and balloonist Bertrand Piccard, who co-piloted Breitling Orbiter 3, the first balloon to circle the world non-stop.[2] The Solar Impulse project's goals were to make the first circumnavigation of the Earth by a piloted fixed-wing aircraft using only solar power and to bring attention to clean technologies.[3]

The aircraft is a single-seated monoplane powered by photovoltaic cells; it is capable of taking off under its own power. The prototype, often referred to as Solar Impulse 1, was designed to remain airborne up to 36 hours.[4]

It conducted its first test flight in December 2009. In July 2010, it flew an entire diurnal solar cycle, including nearly nine hours of night flying, in a 26-hour flight.[5] Piccard and Borschberg completed successful solar-powered flights from Switzerland to Spain and then Morocco in 2012,[6] and conducted a multi-stage flight across the US in 2013.[7][8]

A second aircraft, completed in 2014 and named Solar Impulse 2, carries more solar cells and more powerful motors, among other improvements. On 9 March 2015, Piccard and Borschberg began to circumnavigate the globe with Solar Impulse 2, departing from Abu Dhabi in the United Arab Emirates.[9] The aircraft was scheduled to return to Abu Dhabi in August 2015 after a multi-stage journey around the world.[10] By June 2015, the plane had traversed Asia,[11] and in July 2015, it completed the longest leg of its journey, from Japan to Hawaii.[12] During that leg, the aircraft's batteries sustained thermal damage and took months to replace.[13]

A battery cooling system was installed and Solar Impulse 2 resumed the circumnavigation in April 2016, when it flew on to California.[14][15] It continued across the US until it reached New York City in June 2016.[16] Later that month, the aircraft crossed the Atlantic Ocean to the city of Seville.[17] It stopped in Egypt before returning to Abu Dhabi on 26 July 2016, more than 16 months after it had left (506 days), completing the approximately 42,000-kilometre (26,000-mile) first circumnavigation of the Earth by a piloted fixed-wing aircraft using only solar power.[18][19]

In 2019 the Solar Impulse 2 was sold to Skydweller, a Spanish-American company that is developing autonomous unmanned aerial vehicles capable of continuous flight. It plans to use the plane for research and development flights, after which the Solar Impulse 2 is planned to be on permanent display at the Swiss Museum of Transport.

  1. ^ Cardwell, Diane (1 May 2013). "Cross-Country Solar Plane Expedition Set for Takeoff". The New York Times. Retrieved 2 May 2013.
  2. ^ "A Speck in the Sky". The New York Times. 21 March 1999. Retrieved 24 June 2013.
  3. ^ Div, Stav. "Solar Impulse 2: The groundbreaking aircraft demonstrating the possibilities of clean energy", The Independent, 2 June 2016
  4. ^ "HB-SIA Mission". Solar Impulse Project. Archived from the original on 26 July 2011. Retrieved 5 December 2009.
  5. ^ "Swiss solar plane makes history with night flight". Swisster. 8 July 2010. Retrieved 13 July 2010.
  6. ^ Cite error: The named reference MadridRabat was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Mission was invoked but never defined (see the help page).
  8. ^ "Solar Impulse ends cross-country US flight slightly early in NY due to torn left wing". Engadget. 6 July 2013. Retrieved 7 July 2013.
  9. ^ Batrawy, Aya (9 March 2015). "Solar-powered plane takes off for flight around the world". Associated Press. Retrieved 14 March 2015.
  10. ^ Al Wasmi, Naser (25 September 2014). "Pilots to take off from Abu Dhabi for historic solar-powered flight". The National. Retrieved 7 January 2015.
  11. ^ Cite error: The named reference Leg7 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference JapanHawaii was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Resume2 was invoked but never defined (see the help page).
  14. ^ Amos, Jonathan (21 April 2016). "Solar Impulse sets off for California after long lay-off". BBC.
  15. ^ Berger, Noah. "Solar-powered plane completes journey across Pacific Ocean" Archived 7 May 2016 at the Wayback Machine, The Charlotte Observer, 24 April 2016
  16. ^ Cite error: The named reference RiceJFK was invoked but never defined (see the help page).
  17. ^ Amos, Jonathan. "Solar Impulse completes Atlantic crossing with landing in Seville", BBC, 23 June 2016
  18. ^ Amos, Jonathan. "Solar Impulse: Zero-fuel plane lands in Cairo", BBC News, 13 July 2016
  19. ^ "Solar Impulse completes historic round-the-world trip", BBC News, 26 July 2016

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