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{{Use dmy dates|date=May 2013}}
{{Use British English|date=February 2014}}
{|{{Infobox aircraft begin
|name = Solar Impulse
|image = SolarImpulse HB-SIA landing Brussels Airport 3-crop.jpg
|caption = Solar Impulse 1 landing at [[Brussels Airport]] after its first international flight on 13 May 2011
}}
{{Infobox aircraft type
|type = [[Experimental aircraft|Experimental]] [[solar-powered aircraft]]
|national origin = [[Switzerland|Swiss]]
|manufacturer = Solar Impulse
|designer = Solar Impulse
|first flight = 3 December 2009
|number built = 2 (including prototype)
|program cost = <!--Total program cost-->
}}
|}
'''Solar Impulse''' is the name of a [[Switzerland|Swiss]] long-range [[experimental aircraft|experimental]] [[solar-powered aircraft]] project, and also the name of the project's two operational aircraft.<ref name="NYT-20130501">{{cite news|last=Cardwell|first=Diane|title=Cross-Country Solar Plane Expedition Set for Takeoff|url=http://www.nytimes.com/2013/05/02/business/energy-environment/cross-country-solar-plane-expedition-set-for-takeoff.html|date=1 May 2013|work=[[New York Times]]|accessdate=2 May 2013}}</ref> The privately financed project is led by Swiss businessman [[André Borschberg]] and Swiss [[psychiatrist]] and aeronaut [[Bertrand Piccard]], who co-piloted [[Breitling Orbiter 3]], the first balloon to circle the world non-stop.<ref>{{cite web|url=http://www.nytimes.com/packages/html/sports/year_in_sports/03.21.html|title=A Speck in the Sky|work=New York Times|date=21 March 1999|accessdate=24 June 2013}}</ref> The Solar Impulse project intends to achieve the first [[circumnavigation]] of the Earth by a piloted [[fixed-wing aircraft]] using only solar power.

The aircraft are single-seat [[monoplane]]s powered by [[photovoltaic cell]]s and capable of taking off under their own power. The prototype, often referred to as '''Solar Impulse 1''', was designed to remain airborne up to 36 hours.<ref>{{cite web|url= http://www.solarimpulse.com/en/documents/hbsia_mission.php?lang=en&group=hbsia|title=HB-SIA Mission|author=Solar Impulse Project|accessdate=5 December 2009}}</ref> It conducted its first test flight in December 2009. In July 2010, it flew an entire [[Diurnal cycle|diurnal solar cycle]], including nearly nine hours of night flying, in a 26-hour flight.<ref>
[http://www.swisster.ch/news/science-tech/swiss-solar-plane-makes-history-with-night-flight.html "Swiss solar plane makes history with night flight"]. ''Swisster''. 8 July 2010. Retrieved 13 July 2010.</ref> Piccard and Borschberg completed successful solar-powered flights from Switzerland to Spain and then Morocco in 2012,<ref name=MadridRabat/> and conducted a multi-stage flight across the United States in 2013.<ref name=Mission/><ref name=Engadget>{{cite web| url=http://www.engadget.com/2013/07/06/solar-impulse-ends-cross-country-us-flight-slightly-early-in-ny/?utm_medium=feed&utm_source=Feed_Classic&utm_campaign=Engadget|title=Solar Impulse ends cross-country US flight slightly early in NY due to torn left wing|publisher=Engadget|date=6 July 2013|accessdate=7 July 2013}}</ref>

A second aircraft, completed in 2014 and named '''Solar Impulse 2''', carries more solar cells and more powerful engines, among other improvements. In March 2015, Piccard and Borschberg began a circumnavigation of the globe with Solar Impulse 2, departing from [[Abu Dhabi]] in the United Arab Emirates.<ref name=Batrawy>{{cite web|author=Batrawy, Aya|date=9 March 2015|url=http://news.yahoo.com/solar-powered-plane-takes-off-flight-around-world-041503078.html| title=Solar-powered plane takes off for flight around the world|publisher=[[Associated Press]]|accessdate=14 March 2015}}</ref> The aircraft is scheduled to return to Abu Dhabi in August 2015, upon the completion of its multi-stage journey.<ref name=TheNational>{{Cite news|url = http://www.thenational.ae/uae/pilots-to-take-off-from-abu-dhabi-for-historic-solar-powered-flight|title = Pilots to take off from Abu Dhabi for historic solar-powered flight|last = Al Wasmi|first = Naser|date = 25 September 2014|work = The National|accessdate =7 January 2015 }}</ref> By 1 June 2015, the plane had traversed Asia.<ref name=Leg7/> On 28 June 2015, the plane began the longest leg of its journey, from Japan to Hawaii.<ref name=Morelle/>

==Project development and funding==
Bertrand Piccard initiated the Solar Impulse project in November 2003 after undertaking a feasibility study in partnership with the [[Ecole Polytechnique Fédérale de Lausanne]].<ref>{{cite web|url=http://www.solarimpulse.com/timeline/view/6652|work=Solar Impulse| title=What happened between 2001 and 2003?|date=31 December 2003}}</ref> By 2009, he had assembled a multi-disciplinary team of 50 engineers and technical specialists from six countries, assisted by about 100 outside advisers and 80 technological partners.<ref name=mainstages>{{cite web|url=http://www.solarimpulse.com/en/airplane/major-steps/|title=Major steps|publisher=Solar Impulse|accessdate=5 December 2009}}</ref><ref name=SI-Building/> The project is financed by a number of private companies and individuals, as well as receiving around [[Swiss franc|CHF]]6 million ([[US dollar|US$]]6.4 million) in funding from the Swiss government.<ref>{{cite web|url=http://www.swissinfo.ch/eng/government-supports-solar-impulse-with-chf6m/41279522|title=Government supports Solar Impulse with CHF6m|publisher=SwissInfo.ch|date=18 February 2015|accessdate= 24 March 2015}}</ref>

The first company to officially support the project was [[Semper Gestion]], after its co-founder Eric Freymond was convinced of the future success of Piccard.<ref>{{cite web| url=http://www.nerditorial.com/science-2/semper-gestion-first-partner-of-solar-impulse-project.html|work=Nerditorial|title=Semper Gestion, First partner of Solar Impulse project|date=2 September 2013}}</ref> The project's primary partners are [[Omega SA]], [[Solvay (company)|Solvay]], [[Schindler Group|Schindler]] and [[ABB Group|ABB]].<ref>{{cite web|last=Piccard|first=Bertrand|title=Solar Impulse gets a lift!| url=http://www.solarimpulse.com/timeline/view/7401|date=4 April 2014|accessdate=4 April 2014}}</ref> Other partners and supporters of the project include [[Bayer MaterialScience]], [[Altran]], [[Swisscom]], [[Swiss Re]] (Corporate Solutions), [[Clarins]], [[Toyota]], [[BKW FMB Energie]] and [[Symphony Technology Group]]. The [[EPFL]], the [[European Space Agency]] (ESA) and [[Dassault]] have provided additional technical expertise, while [[SunPower]] provided the aircraft's photovoltaic cells.<ref>{{cite web|url=http://global.sunpowercorp.com/about/sponsor/solar-impulse/|title=Solar Impulse – Around the world in a solar airplane |publisher=SunPower|accessdate= 24 January 2013}}; and {{cite web|last1=Dijakovic| first1=Viktoria| title=Construction HB-SIB Solar Cells|url=http://info.solarimpulse.com/timeline/view/6544|publisher=Solar Impulse|date=17 July 2012}}</ref><ref name="partners">{{cite web|url=http://www.solarimpulse.com/common/documents/partner.php?lang=en&group=partner|title=Partners, Financing Structure|publisher=Solar Impulse |accessdate=25 February 2010}}</ref> In October 2013, Solar Impulse announced that [[Peter Diamandis]], founder of the [[X Prize Foundation]], had become a supporter of the project after meeting with Solar Impulse officials during [[Google]]'s 2013 Zeitgeist event.<ref>{{cite web|url=http://www.solarimpulse.com/timeline/view/7292|publisher=Solar Impulse|title=Peter Diamandis our New Patron|author=Viktoria Dijakovic|date=10 October 2013|accessdate=22 March 2015 }}</ref>

===Timeline===
* 2003: Feasibility study at the École Polytechnique Fédérale de Lausanne
* 2004–2005: Development of the concept
* 2006: Simulation of long-haul flights
* 2006–09: Construction of first prototype (HB-SIA; Solar Impulse 1)
* 2009: First flight of Solar Impulse 1
* 2009–11: Manned test flights<ref name=Lipsey>{{cite web|author=Lipsey, Sid|url=https://www.yahoo.com/travel/secrets-of-the-solar-powered-plane-that-might-make-110026751682.html|title=Secrets of the Solar-Powered Plane That Might Make History|publisher=Yahoo|date= 4 February 2015|accessdate=22 March 2015}}</ref>
* 2011–12: Further test flights through Europe and North Africa
* 2011–13: Construction of second prototype (HB-SIB; Solar Impulse 2)
* 2013: Continental flight across the US by Solar Impulse 1 (''Mission Across America'')<ref name="NYT-20130501" /><ref name=Mission>{{cite web|url=http://www.solarimpulse.com/en/across-america/|title=Across America| publisher=Solar Impulse| year=2013|accessdate=13 June 2013}}</ref><ref name=Engadget/>
* 2014: First flight of Solar Impulse 2
* 2015: Circumnavigation by Solar Impulse 2, conducted in twelve stages over five months<ref name=Batrawy/><ref name=mainstages/><ref name=Keyrouz>{{cite web|author=Keyrouz, Wissam|url=http://news.yahoo.com/solar-plane-revs-historic-round-world-flight-180504805.html |title=Solar plane revs up for historic round-the-world flight|publisher=AFP via Yahoo|date= 7 March 2015|accessdate=22 March 2015}}</ref>

==Solar Impulse 1 (HB-SIA)==
[[File:Cockpit HB-SIA.jpg|thumb|Solar Impulse 1 – fuselage and engines]]
[[File:Prototype HB-SIA.jpg|thumb|Solar Impulse 1 – wing structure]]
The first Solar Impulse aircraft, registered as HB-SIA, was primarily designed as a demonstration aircraft. It has a non-pressurized cockpit and a single wing with a wingspan similar to that of the [[Airbus A340]] airliner. Under the wing are four [[nacelle]]s, each with a set of [[Lithium-ion polymer battery|lithium polymer batteries]], a {{convert|10|hp|kW|1|abbr=on}} electric motor and one twin-bladed propeller. To keep the wing as light as possible, a customised [[carbon fibre]] honeycomb sandwich structure was used.<ref name=SIApdf/> 11,628 [[photovoltaic cells]] on the upper wing surface and the horizontal stabilizer generate electricity during the day to power the electric motors and to charge the batteries allowing flight at night, theoretically enabling the single-seat plane to stay in the air indefinitely.<ref>{{cite news|last=Engeler|first=Eliane|title=Solar plane lands after completing 24-hour flight|url=http://www.businessweek.com/ap/financialnews/D9GQS2FG2.htm|agency=[[Associated Press]]|date=8 July 2010|accessdate=27 May 2015}}</ref><ref name="Avion">{{Cite web|url=http://www.solarimpulse.com/common/documents/challenge_solar.php?lang=en&group=challenge|title=Plane|accessdate=18 June 2011|publisher=Solar Impulse}}</ref>

The aircraft's major design constraint is the capacity of the lithium polymer batteries. Over an optimum 24-hour cycle, the motors can deliver a combined average of about {{convert|8|hp|kW|0|abbr=on}}, roughly the power used by the [[Wright brothers]]' [[Wright Flyer|Flyer]], the first successful powered aircraft, in 1903.<ref name=SIApdf/> In addition to the charge stored in its batteries, the aircraft uses the [[potential energy]] of height gained during the day to power its night flights.<ref>{{cite web|url=http://www.solarimpulse.com/common/documents/blog.php?lang=en&group=media&id=105&comment=visible|title=Description of HB-SIA|work=SolarImpulse.com|date=22 June 2010|accessdate=9 July 2010}}</ref>

===Specifications===
{{Aircraft specifications
|plane or copter?=plane
|jet or prop?=prop
|ref=Solar Impulse Project<ref name=SIApdf>{{cite web|url=http://www.solarimpulse.com/pdf/hb-sia/hb-sia_en.pdf| title=Around the World in a Solar Airplane: Solar Impulse|format=PDF|author=Solar Impulse|year=2009| accessdate=24 June 2013}}</ref> ''and'' Diaz<ref name="Diaz">{{cite web|url=http://gizmodo.com/262940/solar-impulse-around-the-world-in-a-100-sun+powered-airplane|title=Solar Impulse: Around the World in a 100% Sun-powered Airplane|last=Diaz| first=Jesus| date=23 May 2007|publisher=Gizmodo|accessdate=25 February 2010}}</ref>
|crew=1
|length main=21.85 m
|length alt=71.7 ft
|span main=63.4 m
|span alt=208 ft
|height main=6.40 m
|height alt=21.0 ft
|area main=11,628 photovoltaic cells rated at 45 kW peak: {{Nowrap|200 m<sup>2</sup>}}
|area alt=2,200 sq ft
|airfoil=
|aspect ratio=19.7
|empty weight main=
|empty weight alt=
|loaded weight main= 1,600 kg
|loaded weight alt= 3,500 lb
|useful load main=
|useful load alt=
|max takeoff weight main= 2,000 kg
|max takeoff weight alt= 4,400 lb
|more general='''Take-off speed:''' {{convert|35|km/h}}
|engine (prop)=electric motors
|type of prop=
|number of props=4
|power main= 4 x 21 kWh [[lithium-ion battery|lithium-ion batteries]] ({{Nowrap|450 kg}}), providing 7.5 kW
|power alt= 10 HP
|propeller or rotor?=propellor
|propellers=
|number of propellers per engine=1
|propeller diameter main=3.5 m at 200 to 400 rpm
|propeller diameter alt=11 ft
|max speed main=
|max speed alt=
|max speed more=
|cruise speed main= {{convert|70|km/h}}
|cruise speed alt=
|cruise speed more=
|stall speed main=
|stall speed alt=
|stall speed more=
|never exceed speed main=
|never exceed speed alt=
|endurance= 36 hours (projected)
|ceiling main= 8,500 m
|ceiling alt= 27,900 ft
|ceiling more= with a maximum altitude of {{convert|12000|m}}
|climb rate main=
|climb rate alt=
|climb rate more=
|loading main=
|loading alt=
|thrust/weight=
|power/mass main=
|power/mass alt=
|more performance=
}}

===Operational history===

==== Maiden flight and other early flights ====
[[File:Flea Hop HB-SIA - Solar Impulse.jpg|thumb|Solar Impulse 1 during its first "flea hop" test flight in [[Dübendorf]] on 3 December 2009]]
On 26 June 2009, Solar Impulse 1 was first presented to the public at the [[Dübendorf Air Base]], Switzerland. Following taxi testing, a short-hop test flight was made on 3 December 2009,<ref>{{cite news|url=http://news.bbc.co.uk/1/hi/sci/tech/8393688.stm|title=Record solar plane's first 'hop'|date=3 December 2009|work=BBC|accessdate=4 December 2009|first=Jason|last=Palmer}}</ref> piloted by Markus Scherdel.<ref name=newscientist3Dec09>{{cite web|url=http://www.newscientist.com/article/dn18233-solarpowered-piloted-plane-makes-its-first-flea-hop.html|title=Solar-powered piloted plane makes its first 'flea hop'|author=Tom Simonite|date=3 December 2009|work=Web Edition|publisher=New Scientist|accessdate=5 December 2009}}</ref> André Borschberg, co-leader of the project team, said of the flight:
{{blockquote|"It was an unbelievable day. The airplane flew for about {{convert|350|m}} and about {{convert|1|m}} above the ground&nbsp;... The aim was not to get high but to land on the same runway at a speed to test its controllability and get a first feeling of its flying characteristics ... the craft behaved just as the engineers had hoped. It is the end of the engineering phase and the start of the flight testing phase."<ref name=newscientist3Dec09/>}}
On 7 April 2010, the plane conducted an 87-minute test flight, piloted by Markus Scherdel. This flight reached an altitude of {{convert|1200|m|ft|0|abbr=on}}.<ref>{{cite news|url=http://www.latimes.com/technology/sns-ap-eu-switzerland-solar-adventure,0,3199191.story|title=Swiss team makes 1st test flight of prototype for round-the-world solar flight|work=Los Angeles Times|date=1 July 2010|accessdate=9 July 2010|deadurl=yes}}{{Dead link|date=September 2010|bot=RjwilmsiBot}}</ref><ref>{{cite news|author=<!--start post navigation--> Previous post Next post|url=http://www.wired.com/autopia/2010/04/solar-airplane-completes-maiden-voyage|title=Solar Airplane Completes Maiden Voyage|work=Wired.com|date=7 April 2010|accessdate=9 July 2010}}</ref> On 28 May 2010, the aircraft made its first flight powered entirely by solar energy, charging its batteries in flight.<ref name="AvWeb31May10">{{cite web|url=http://www.avweb.com/avwebflash/news/SolarImpulseFliesOnPureSunlight_202647-1.html|title=Solar Impulse Flies On Pure Sunlight|accessdate=3 June 2010|last=Grady|first=Mary|date=May 2010}}</ref>

====First overnight flight====
{{wikinews|Solar-powered plane completes 26-hour flight}}
On 8 July 2010, Solar Impulse 1 achieved the world's first manned 26-hour solar-powered flight.<ref>{{cite news| last=Maron|first=Dina Fine|title=Swiss Team to Launch Solar Night Flight|url=http://www.nytimes.com/cwire/2010/07/06/06climatewire-swiss-team-to-launch-solar-night-flight-9738.html|work =The New York Times|agency=[[ClimateWire]]| date=6 July 2010|accessdate=8 July 2010}}</ref><ref>{{cite news|title=Solar Impulse completes record-breaking flight| url=http://www.telegraph.co.uk/earth/energy/solarpower/7878526/Solar-Impulse-completes-record-breaking-flight.html| work=[[The Daily Telegraph]]|date=8 July 2010|accessdate=8 July 2010|location=London}}</ref><ref>{{cite news| last=Paur| first=Jason|title=Solar Airplane to Fly Through the Night (Tonight!)|url=http://www.wired.com/autopia/2010/07/solar-airplane-to-fly-through-the-night-tonight|work=Wired|date=7 July 2010|accessdate=8 July 2010}}</ref> The airplane was flown by André Borschberg, and took off at {{Nowrap|6:51 a.m.}} [[Central European Time|Central European Summer Time]] (UTC+2) on 7 July from [[Payerne Air Base]], Switzerland. It returned for a landing the following morning at {{Nowrap|9:00 a.m.}} local time.<ref>{{cite news|last=van Loon|first=Jeremy|title=Solar-Powered Plane Lands Safely After Overnight Flight| url=http://news.businessweek.com/article.asp?documentKey=1377-a4lM164962iU-6B58GM9T9AIUVKONT5V3EIC6KO| work=[[BusinessWeek]]|date=8 July 2010|accessdate=8 July 2010}}</ref> During the flight, the plane reached a maximum altitude of {{convert|8700|m|abbr=on}}.<ref>{{cite news|title=Solar-powered plane lands safely after 26-hour flight|url=http://news.bbc.co.uk/2/hi/world/europe/10550430.stm|publisher=BBC|date=8 July 2010|accessdate=8 July 2010}}</ref> At the time, the flight was the longest and highest ever flown by a manned solar-powered aircraft; these records were officially recognized by the [[Fédération Aéronautique Internationale]] (FAI) in October 2010.<ref>{{cite news| url=http://www.nytimes.com/2010/07/09/world/europe/09plane.html|accessdate=8 July 2010|work=The New York Times| author=Alan Cowell|title=Solar-Powered Plane Flies for 26 Hours|date=8 July 2010}}</ref><ref>{{cite web| url=http://www.fai.org/news-of-records/35101-the-fai-ratifies-solar-impulses-world-records|title=The FAI ratifies Solar Impulse's World Records|accessdate=22 October 2010}}</ref>

====International and intranational flights====

=====Belgium and France (2011)=====
[[File:Solar Impulse Bruxelles 2011.jpg|thumb|Solar Impulse 1 at [[Brussels Airport]] in May 2011.]]
On 13 May 2011 at 21:30 local time, the plane landed at [[Brussels Airport]], after completing a 13-hour flight from its home base in Switzerland. It was the first international flight by the Solar Impulse, which flew at an average altitude of {{convert|6000|ft|m|sigfig=2|abbr=on}} for a distance of {{convert|630|km|mi|0|abbr=on}}, with an average speed of {{convert|50|km/h|mph|0|abbr=on}}. The aircraft's slow cruising speed required operating at a mid-altitude, allowing much faster air traffic to be routed around it.<ref>{{cite web|url=http://www.planet-techno-science.com/ciel-et-espace/solar-impulse-premier-vol-international-reussi-pour-lavion-solaire/|title=Solar Impulse: Premier vol international réussi pour l’avion solaire|publisher=Planet Techno Science|date=14 May 2011|accessdate=15 June 2013|language=French}}</ref> The aircraft was piloted by Andre Borschberg. The project's other co-founder, Bertrand Piccard, said in an interview after the landing: "Our goal is to create a revolution in the minds of people...to promote solar energies – not necessarily a revolution in aviation."<ref>{{cite news|title=Solar-Powered Airplane Makes Historic Flight|url=http://blogs.forbes.com/oshadavidson/2011/05/13/breaking-solar-airplane-about-to-make-historic-landing.html|accessdate=13 May 2011|work=Forbes|author=Osha Gray Davidson|date=13 May 2011}}</ref><ref name="AvWeb15May11">{{Cite news|url=http://www.avweb.com/avwebflash/news/Solar_Impulse_Crosses_Borders_204657-1.html|title=Solar Impulse Crosses Border|accessdate=16 May 2011|last=Niles|first=Russ|date=May 2011|work=AvWeb}}</ref>

A second international flight to the [[Paris Air Show]] was attempted on 12 June 2011, but the plane turned back and returned to Brussels, due to adverse weather conditions.<ref>{{cite news|title=A setback for Solar Impulse: the solar plane favours safety and heads back to Brussels|url=http://www.solarimpulse.com/common/documents/news_affich.php?lang=en&group=news&IdArticle=90|accessdate=15 June 2011|date=June 2011}}</ref> In a second attempt on 14 June, André Borschberg successfully landed the aircraft at Paris' [[Le Bourget Airport]] at 9:15 pm after a 16-hour flight.<ref>{{cite news|title=Solar Impulse Plane: A Rare Treat For Crowds in Paris|url=http://tv.ibtimes.com/solar-impulse-plane-a-rare-treat-for-crowds-in-paris/890.html|accessdate=15 June 2011|last=Marisa|first=Krystian|date=June 2011}}</ref>

=====First intercontinental flight (2012)=====
On 5 June 2012, the Solar Impulse successfully completed its first intercontinental flight, a 19-hour trip from [[Madrid]], Spain, to [[Rabat]], Morocco.<ref name=MadridRabat>{{cite web|url=http://www.reuters.com/article/2012/06/05/aviation-solar-idUSL5E8H5A4U20120605|title=Solar plane completes maiden intercontinental trip|publisher=[[Reuters]]|date=5 June 2012|accessdate=6 June 2012}}</ref> During the first leg of the flight from [[Payerne]], Switzerland, to Madrid, the aircraft broke several further records for solar flight, including the longest solar-powered flight between pre-declared waypoints ({{convert|1099.3|km|mi|0|abbr=on}}) and along a course ({{convert|1116|km|mi|0|abbr=on}}).<ref>[http://www.solarimpulse.com/timeline/view/6636/en Solar Impulse’s HB-SIA obtains two new world records]. SolarImpulse.com. 26 September 2012. See also: [http://www.fai.org/fai-record-file/?recordId=16558 FAI Record ID #16558] and [http://www.fai.org/fai-record-file/?recordId=16560 FAI Record ID #16560].</ref>

=====United States (2013)=====
[[File:Solar Impulse JFK July 14 2013.jpg|thumb|Solar Impulse 1 on display at [[John F. Kennedy International Airport]], New York, on 14 July 2013.]]
On 3 May 2013, the plane began its cross-US flight with a journey from [[Moffett Field]] in [[Mountain View, California]], to [[Phoenix Sky Harbor International Airport]] in [[Arizona]]. Successive legs of the flight took the Solar Impulse to [[Dallas-Fort Worth airport]], [[Lambert–St. Louis International Airport]], an overnight stop at [[Cincinnati Municipal Lunken Airport]], and [[Washington Dulles International Airport]]; it concluded at [[New York]]'s [[John F. Kennedy International Airport]] on 6 July. Each flight leg took between 19 and 25 hours, with multi-day stops in each city (except Cincinnati) between flights.<ref>{{cite web|title=Solar plane leaves Calif. on cross-country trip|url=http://hosted.ap.org/dynamic/stories/U/US_SOLAR_PLANE?SITE=FLDAY&SECTION=HOME&TEMPLATE=DEFAULT&utm_source=twitterfeed&utm_medium=twitter|work=Daytona Beach News Journal|accessdate=3 May 2013}}</ref>

After the first leg to Phoenix,<ref name=Mission/> the aircraft completed the second leg of its trip on 23 May, landing at Dallas-Fort Worth International Airport. This flight, which covered {{convert|1541|km|mi}}, set several new world distance records in solar aviation.<ref>{{cite web|title=Solar plane completes 2nd leg of trip in Texas|url=http://bigstory.ap.org/article/solar-plane-completes-2nd-leg-trip-texas|publisher=AP|date=23 May 2013|accessdate=10 July 2013}}</ref><ref>{{cite web|title=Solar Plane Completes Longest Leg of Cross-Country Flight|url=http://news.yahoo.com/solar-plane-completes-longest-leg-cross-country-flight-143703130.html|publisher=Yahoo News|date=23 May 2013|accessdate=10 July 2013}}</ref><ref>{{cite web|title=FAI Record ID #16815 – Straight distance, pre-declared waypoints|url=http://www.fai.org/fai-record-file/?recordId=16815|publisher=FAI|accessdate=9 July 2013}}</ref><ref>{{cite web|title=FAI Record ID #16817 – Free Distance|url=http://www.fai.org/fai-record-file/?recordId=16817|publisher=FAI|accessdate=9 July 2013}}</ref><ref>{{cite web|title=FAI Record ID #16816 – Distance along a course, pre-declared waypoints|url=http://www.fai.org/fai-record-file/?recordId=16816|publisher=FAI|accessdate=9 July 2013}}</ref> On 4 June, the plane landed in [[St. Louis]], [[Missouri]].<ref>{{cite web|url=http://www.bbc.co.uk/news/science-environment-22754126|title=Solar Impulse lands in St Louis in trans-America bid|publisher=BBC|date=4 June 2013|accessdate=13 June 2013}}</ref> It departed for [[Washington DC]] on 14 June, stopping overnight in [[Cincinnati, Ohio]], to change pilots and avoid strong winds.<ref>{{cite web|url=http://www.bbc.co.uk/news/science-environment-22902402|title=Two hops for trans-US solar plane|publisher=BBC|date=14 June 2013|accessdate=14 June 2013}}</ref> On 16 June, the plane landed at Washington Dulles International Airport in [[Virginia]].<ref>{{cite web|url=http://www.bbc.co.uk/news/science-environment-22902402|title=Trans-US solar plane reaches Dulles|publisher=BBC|date=16 June 2013|accessdate=16 June 2013}}</ref> On 6 July 2013, following a lengthy layover in Washington, Solar Impulse completed its cross-country journey, landing at New York City's JFK International Airport at 11:09&nbsp;p.m. EDT.<ref name=Engadget/><ref>{{cite web|title=Solar Powered Plane Finishes Journey, Lands in NYC|url=http://bigstory.ap.org/article/solar-powered-plane-final-leg-flight-nyc|publisher=AP|date=7 July 2013|accessdate=7 July 2013}}</ref> The landing occurred three hours earlier than originally intended, because a planned flyby of the [[Statue of Liberty]] was cancelled due to damage to the covering on the left wing.<ref name=Engadget/> Solar Impulse 1 was placed on public display at JFK after its landing. In August 2013, it was disassembled and transported to [[Dübendorf Air Base]] where it was placed in storage in a hangar.

;'''Detailed route'''
''Source:''<ref name=AcrossAmerica1>{{cite web|title=Across America Event Summary|url=http://info.solarimpulse.com/en/solar-flights/across-america/|publisher=Solar Impulse|accessdate=9 March 2015}}</ref>
{| class="wikitable" style="font-size: 85%"
! Leg
! Start
! Stop
! Origin
! Destination
! Distance
! Flight time
! Avg. speed
! Pilot
|-
! 1
| &nbsp;3 May 2013, 06:12 PDT (UTC-7)
| &nbsp;4 May 2013, 00:30 MST (UTC-7)
| Moffett Field, California ([[Moffett Federal Airfield|KNUQ]])
| Phoenix, Arizona ([[Phoenix Sky Harbor International Airport|KPHX]])
| align=right | &nbsp;km
| align=right | 18 hrs 18 mins
| align=right | &nbsp;km/h
| [[Bertrand Piccard]]
|-
! 2
| 22 May 2013, 04:47 MST (UTC-7)
| 23 May 2013, 01:08 CDT (UTC-5)
| Phoenix, Arizona ([[Phoenix Sky Harbor International Airport|KPHX]])
| Dallas, Texas ([[Fort Worth International Airport|KDFW]])
| align=right | 1541&nbsp;km
| align=right | 18 hrs 21 mins
| align=right |
| [[André Borschberg]]
|-
! 3
| &nbsp;3 Jun 2013, 04:06 CDT (UTC-5)
| &nbsp;4 Jun 2013, 01:28 CDT (UTC-5)
| Dallas, Texas ([[Fort Worth International Airport|KDFW]])
| Saint Louis, Missouri ([[Lambert–St. Louis International Airport|KSTL]])
| align=right | 1040&nbsp;km
| align=right | 21 hrs 22 mins
| align=right | 49&nbsp;km/h
| Bertrand Piccard
|-
! 4
| 14 Jun 2013, 05:01 CDT (UTC-5)
| 14 Jun 2013, 20:15 EDT (UTC-4)
| Saint Louis, Missouri ([[Lambert–St. Louis International Airport|KSTL]])
| Cincinnati, Ohio ([[Cincinnati Municipal Lunken Airport|KLUK]])
|
| align=right | 15 hrs 14 mins
|
| André Borschberg
|-
! 5
| 15 Jun 2013, 10:10 EDT (UTC-4)
| 16 Jun 2013, 00:15 EDT (UTC-4)
| Cincinnati, Ohio ([[Cincinnati Municipal Lunken Airport|KLUK]])
| Washington, DC ([[Washington Dulles International Airport|KIAD]])
|
| align=right | 14 hrs 5 mins
|
| Bertrand Piccard
|-
! 6
| &nbsp;6 July 2013, 04:56 EDT (UTC-4)
| &nbsp;7 July 2013, 00:15 EDT (UTC-4)
| Washington, DC ([[Washington Dulles International Airport|KIAD]])
| New York City, New York ([[John F. Kennedy International Airport|KJFK]])
|
| align=right | 19 hrs 19 mins
|
| André Borschberg
|-
|}

==Solar Impulse 2 (HB-SIB)==
[[File:Solar Impulse SI2 pilote Bertrand Piccard Payerne November 2014.jpg|thumb|Solar Impulse 2 at Payerne aerodrome in November 2014]]

===Construction history===
Construction of the second aircraft, known as Solar Impulse 2 and carrying the Swiss registration HB-SIB, started in 2011. Completion was initially planned for 2013, with a 25-day circumnavigation of the globe planned for 2014. However, a structural failure of the aircraft's main spar occurred during static tests in July 2012, leading to delays in the flight testing schedule to allow for repairs. Solar Implulse 2's first flight occurred at Payerne aerodrome on 2 June 2014.<ref>{{cite journal| magazine=Sport Aviation|date=July 2014|page=14|title=First Flight for Solar Impulse 2}}</ref>

===Design===
The wingspan of Solar Impulse 2 is {{convert|71.9|m|ft|abbr=on}}, slightly less than that of an [[Airbus A380]], the world's largest passenger [[airliner]],<ref name="Diaz"/> but unlike the 500-ton A380, the carbon-fibre Solar Impulse weighs only {{convert|2.3|t|lb}}, little more than an average automobile. It features a non-pressurized cockpit 3.8 cubic meters in size<ref name=Reisinger>Reisinger, Don. [http://www.cnet.com/au/news/solar-powered-plane-embarks-on-longest-leg-of-round-the-world-flight/ "Solar-powered plane embarks on longest leg of round-the-world flight"], Cnet.com, June 29, 2015</ref> and advanced [[avionics]], including an [[autopilot]] to allow for multi-day transcontinental and trans-oceanic flights.<ref name=mainstages/> [[Oxygen mask|Supplemental oxygen]] and various other environmental support systems allow the pilot to cruise up to an altitude of {{convert|12000|m}}.<ref name="Diaz"/>

===Specifications===
{{Aircraft specifications
|plane or copter?=plane
|jet or prop?=prop
|ref=Solar Impulse Project<ref name=SI-Building>[http://www.solarimpulse.com/en/our-adventure/building-a-solar-airplane "Building a Solar Airplane"]. Solar Impulse. Retrieved 19 January 2015.</ref>
|crew=1
|length main=22.4 m
|length alt= 73.5 ft
|span main=71.9 m
|span alt=236 ft
|height main=6.37 m
|height alt= 20.9 ft
|area main=17,248 photovoltaic cells cover the top of the wings, fuselage and tailplane for a total area of 269.5 m<sup>2</sup>
|area alt= rated at 66 kW peak
|airfoil=
|aspect ratio=
|empty weight main=
|empty weight alt=
|loaded weight main= 2,300 kg
|loaded weight alt= 5,100 lb
|useful load main=
|useful load alt=
|max takeoff weight main=
|max takeoff weight alt=
|more general='''Take-off speed:''' 20 kts (36 km/h)
|engine (prop)= electric motors powered from solar cells and 4 x 41 kWh lithium-ion batteries ({{Nowrap|633 kg}}), providing 13 kW<ref name=Lipsey/>
|type of prop=
|number of props=4
|power main=electric motors
|power alt=17.4 HP
|propeller or rotor?=propeller
|propellers=
|number of propellers per engine=1
|propeller diameter main= 4 m
|propeller diameter alt= 13.1 ft
|max speed main= 77 kts
|max speed alt= 140 km/h
|max speed more= 87 mph
|cruise speed main= 49 kts (90 km/h)
|cruise speed alt= 33 kts (60 km/h) at night to save power
|cruise speed more=
|stall speed main=
|stall speed alt=
|stall speed more=
|never exceed speed main=
|never exceed speed alt=
|endurance=
|ceiling main= 8,500 m
|ceiling alt= 27,900 ft
|ceiling more= with a maximum altitude of {{convert|12000|m}}
|climb rate main=
|climb rate alt=
|climb rate more=
|loading main=
|loading alt=
|thrust/weight=
|power/mass main=
|power/mass alt=
|more performance=
}}

===Operational history===
[[File:Solar Impulse-IMG 8410.jpg|thumb|upright|Uniforms used on ''Solar Impulse''.]]
Solar Impulse 2 was first publicly displayed on 9 April 2014.<ref name=SI-Building/> Its inaugural flight took place on 2 June 2014, piloted by Markus Scherdel.<ref>{{cite web|title=Solar plane makes inaugural flight|url=http://www.bbc.co.uk/news/science-environment-27659068|publisher=BBC|date=2 June 2014|accessdate=2 June 2014}}</ref> The aircraft averaged a ground speed of 30 knots, and reached an altitude of 5,500&nbsp;feet.<ref>{{cite news|work=[[Aviation Week & Space Technology]]|title=Solar Impulse Flies Aircraft For Round-the-World Attempt|date=9 June 2014|page=14}}</ref> The first night flight was completed on 26 October 2014, and the aircraft reached its maximum altitude during a flight on 28 October 2014.

===Circumnavigation flight (2015)===
Due to the repair work to the aircraft's main spar, Solar Impulse 2's circumnavigation of the Earth was rescheduled from 2012 to 2015.<ref name=Spar2012>[http://www.solarimpulse.com/en/airplane/hb-sib/ Timeline: "Without a spar, what's next?"] Solar Impulse. 19 July 2012. Retrieved 28 June 2013.</ref> The aircraft was delivered to [[Masdar]] in Abu Dhabi for the [[World Future Energy Summit]] in late January 2015,<ref>{{cite web|url=http://www.solarimpulse.com/en/our-adventure/the-first-round-the-world-solar-flight/|title=Our Adventure|publisher=Solar Impulse|accessdate=19 January 2015}}</ref> and it began the journey on 9 March 2015.<ref name=Batrawy/><ref name=Schreck1>{{cite web| author=Schreck, Adam|url=http://finance.yahoo.com/news/solar-plane-pioneers-lay-round-world-flight-plan-080306681.html| title=Solar plane pioneers lay out round-the-world flight plan|publisher=Associated Press|date=20 January 2015|accessdate= 21 January 2015}}</ref> It is scheduled to return to the same location in August 2015.<ref name=TheNational/><ref name=Quartz/> A mission control centre for the circumnavigation was established in [[Monaco]], utilizing satellite links to gather real-time flight telemetry and remain in constant contact with the aircraft.<ref>{{cite web|url=http://www.abb-conversations.com/2015/02/solar-impulse-launches-mission-control-center-in-monaco/|title=Solar Impulse launches Mission Control Center in Monaco|publisher=ABB Conversations|date=23 February 2015|accessdate=21 March 2015}}</ref>

Solar Impulse 2 is currently circling the world in the [[Northern Hemisphere|northern hemisphere]]; the closest it will get to the equator will be a flyby of [[Honolulu]] at [[21st parallel north|21.3° N]].<ref name=Quartz>{{cite web|author=Mudallal, Zainab|url=http://qz.com/325922/watch-this-solar-powered-airplanes-first-around-the-world-flight/|title=This solar-powered airplane is about to take its first around-the-world flight|publisher=Quartz|date=16 January 2015|accessdate= 19 January 2015}}</ref>{{Failed verification|date=April 2015|reason=Hawaii or Honolulu are not mentioned in the citation nor does it mention that the flight is entire in the Northern Hemisphere}} Thirteen stops are planned to allow the alternation and rest periods of pilots Borschberg and Piccard, and to ensure good weather conditions for each take-off and landing site along the route.<ref>Molko, David. [http://www.cnn.com/2015/04/16/tech/solar-impulse-plane-china/ "Solar-powered plane on round-the-world flight gets stuck in China"], CNN, April 17, 2015</ref> For most of its time airborne, Solar Impulse 2 is cruising at between 50 and 100 kilometers per hour – usually at the slower end of that range at night, in order to save power. The legs of the flight crossing the Pacific and Atlantic oceans are the longest stages of the circumnavigation, and are each expected to take about five days, covering a distance of up to 7,900 kilometres (4,900 miles).<ref name=TheNational/><ref name=Keyrouz/> On multi-day flights, the pilots take 20-minute naps and use Yoga or other exercises to promote blood flow and maintain alertness.<ref name=Reisinger/>

By the end of May 2015, the plane had traversed Asia and was beginning its journey over the Pacific Ocean.<ref>Amos, Jonathan. [http://www.bbc.com/news/science-environment-32946874 "Solar Impulse plane begins Pacific crossing"], ''BBC News'', May 31, 2015</ref> Deteriorating weather, however, forced an unscheduled stop on 1 June in [[Nagoya]], Japan, as the team awaited favourable weather on the route to Hawaii.<ref name=Leg7/><ref>Randall, Tom. [http://www.bloomberg.com/news/features/2015-06-15/solar-impulse-sun-powered-plane-is-about-to-smash-some-records "This Plane Runs on Sun and Is About to Smash Some Records"], Bloomberg.com, June 15, 2015</ref> On 28 June 2015, the aircraft began the journey from Japan to Hawaii.<ref name=Morelle>Morelle, Rebecca. [http://www.bbc.com/news/science-environment-33244912 "Solar Impulse begins second bid to cross Pacific Ocean"], BBC News, 28 June 2015</ref> On July 1, 2015, Borschberg broke the endurance record for solo flight, as well as the record for longest-duration and distance flight in a solar-powered aircraft. The plane is expected to reach Hawaii on July 3.<ref>Coldewey, Devin. [http://www.nbcnews.com/tech/innovation/solar-impulse-pilot-andre-borschberg-breaks-solo-endurance-flight-record-n385471 "Solar Impulse Pilot Andre Borschberg Breaks Solo Endurance Flight Record"], NBC News, July 1, 2015</ref>

====Detailed route====
''Sources:''<ref name=Schreck1/><ref>{{cite web|url=http://www.solarimpulse.com/rtw|title=Solar Impule RTW|publisher=solarimpulse.com|accessdate=March 30, 2015}}</ref>
{| class="wikitable" style="font-size: 85%"
! Leg
! Start<ref>All start times are given as [[UTC]], and all start dates are 2015.</ref>
! Origin
! Destination
! Flight time
! {{tooltip|Distance|Actual flight distance}}
! Avg. speed
! Max. altitude
! Pilot
|-
! 1
| 9 March 03:12
| {{flagicon|UAE}} [[Abu Dhabi]], [[United Arab Emirates|UAE]]
| {{flagicon|OMA}} [[Muscat, Oman]]
| align=right | 13&nbsp;hrs&nbsp;1&nbsp;min
| align=right | {{convert|441|km|nmi|disp=flip|abbr=on|lk=on}}
| align=right | {{convert|33.9|km/h|kn|disp=flip|abbr=on|lk=on}}
| align=right | {{convert|6383|m|ft|disp=flip|abbr=on|lk=on}}
| [[André Borschberg|A. Borschberg]]<ref>{{cite web|title=Leg 1 of 13 – Abu Dhabi, United Arab Emirates to Muscat, Oman |url=http://www.solarimpulse.com/leg-1-from-Abu_Dhabi-to-Muscat|publisher=Solar Impulse}}</ref>
|-
! 2
| 10 Mar. 02:35
| {{flagicon|OMA}} [[Muscat, Oman|Muscat]], [[Oman]]
| {{flagicon|IND}} [[Ahmedabad]], [[India]]
| align=right | 15&nbsp;hrs&nbsp;20&nbsp;mins
| align=right | {{convert|1485|km|nmi|disp=flip|abbr=on}}
| align=right | {{convert|96.8|km/h|kn|disp=flip|abbr=on}}
| align=right | {{convert|8874|m|ft|disp=flip|abbr=on}}
| [[Bertrand Piccard|B. Piccard]]<ref>{{cite web|title=Leg 2 of 13 – Muscat, Oman to Ahmedabad, India |url=http://www.solarimpulse.com/leg-2-from-Muscat-to-Ahmedabad|publisher=Solar Impulse}}</ref>
|-
! 3
| 18 Mar. 01:48
| {{flagicon|IND}} [[Ahmedabad]], [[India]]
| {{flagicon|IND}} [[Varanasi]], [[India]]
| align=right | 13&nbsp;hrs&nbsp;15&nbsp;mins
| align=right | {{convert|1215|km|nmi|disp=flip|abbr=on}}
| align=right | {{convert|91.7|km/h|kn|disp=flip|abbr=on}}
| align=right | {{convert|5182|m|ft|disp=flip|abbr=on}}
| Borschberg<ref>{{cite web|title=Leg 3 of 13 – Ahmedabad to Varanasi, India |url=http://www.solarimpulse.com/leg-3-from-Ahmedabad-to-Varanasi|publisher=Solar Impulse}}</ref>
|-
! 4
| 18 Mar. 23:52
| {{flagicon|IND}} [[Varanasi]], [[India]]
| {{flagicon|MYA}} [[Mandalay]], [[Myanmar]]
| align=right | 13&nbsp;hrs&nbsp;29&nbsp;mins
| align=right | {{convert|1398|km|nmi|disp=flip|abbr=on}}
| align=right | {{convert|103.7|km/h|kn|disp=flip|abbr=on}}
| align=right | {{convert|8230|m|ft|disp=flip|abbr=on}}
| Piccard<ref>{{cite web|title=Leg 4 of 13 – Varanasi, India to Mandalay, Myanmar |url=http://www.solarimpulse.com/leg-4-from-Varanasi-to-Mandalay|publisher=Solar Impulse}}</ref>
|-
! 5
| 29 Mar. 21:06
| {{flagicon|MYA}} [[Mandalay]], [[Myanmar]]
| {{flagicon|CHN}} [[Chongqing]], [[China]]
| align=right | 20&nbsp;hrs&nbsp;29&nbsp;mins
| align=right | {{convert|1459|km|nmi|disp=flip|abbr=on}}
| align=right | {{convert|71.2|km/h|kn|disp=flip|abbr=on}}
| align=right | {{convert|8634|m|ft|disp=flip|abbr=on}}
| Piccard<ref>{{cite web|title=Leg 5 of 13 – Mandalay, Myanmar to Chongqing, People's Republic of China|url=http://www.solarimpulse.com/leg-5-from-Mandalay-to-Chongqing|publisher=Solar Impulse}}</ref>
|-
! 6
| 20 April 22:06
| {{flagicon|CHN}} [[Chongqing]], [[China]]
| {{flagicon|CHN}} [[Nanjing]], [[China]]
| align=right | 17&nbsp;hrs&nbsp;22&nbsp;mins
| align=right | {{convert|1344|km|nmi|disp=flip|abbr=on}}
| align=right | {{convert|77.4|km/h|kn|disp=flip|abbr=on}}
| align=right | {{convert|4270|m|ft|disp=flip|abbr=on}}
| Piccard<ref>{{cite web|title=Leg 6 of 13 – Chongqing to Nanjing, People's Republic of China|url=http://www.solarimpulse.com/leg-6-from-Chongqing-to-Nanjing|publisher=Solar Impulse}}</ref>
|-
! 7
| 30 May 18:39
| {{flagicon|CHN}} [[Nanjing]], [[China]]
| {{flagicon|JPN}} [[Nagoya]], [[Japan]]{{ref|rw1|N1}}
| align=right | 44&nbsp;hrs&nbsp;10&nbsp;mins
| align=right | {{convert|2852|km|nmi|disp=flip|abbr=on}}
| align=right | {{convert|64.6|km/h|kn|disp=flip|abbr=on}}
| align=right | {{convert|28000|ft|m|abbr=on}}
|Borschberg<ref name=Leg7>{{cite web|title=Leg 7 of 13 – Nanjing, China to Nagoya, Japan |url=http://www.solarimpulse.com/leg-7-from-Nanjing-to-Nagoya|publisher=Solar Impulse}}; [http://www.thesundaily.my/news/1438636 "Solar Impulse touches down on unscheduled Japan stop"], ''The Sun Daily'' (Malaysia), 2 June 2015</ref>
|-
! 8
| 28 June 18:03
| {{flagicon|JPN}} [[Nagoya]], Japan
| {{flagicon|USA}} [[Hawaii]], USA
| align=right | 120&nbsp;hrs&nbsp;(planned)
| align=right | {{convert|7900|km|nmi|disp=flip|abbr=on}}&nbsp;(planned)
| align=right | <!-- Calculated speed -->
| align=right | {{convert|30052|ft|m|abbr=on}}
|Borschberg<ref>{{cite web|title=Leg 8 of 13 – Nagoya, Japan to Hawaii, USA |url=http://www.solarimpulse.com/leg-8-from-Nagoya-to-Hawaii|publisher=Solar Impulse}}</ref>
|-
! 9
|
| {{flagicon|USA}} [[Hawaii]], [[USA]]
| {{flagicon|USA}} [[Phoenix, Arizona|Phoenix, AZ]], [[USA]]
| align=right | 100&nbsp;hrs&nbsp;(planned)
| align=right | {{convert|4707|km|nmi|disp=flip|abbr=on}}&nbsp;(planned)
| align=right | <!-- Calculated speed -->
| align=right | <!-- Maximum altitude -->
|<ref>{{cite web|title=Leg 9 of 13 – Hawaii to Phoenix, USA |url=http://www.solarimpulse.com/leg-9-from-Hawaii-to-Phoenix|publisher=Solar Impulse}}</ref>
|-
! 10
|
| {{flagicon|USA}} [[Phoenix, Arizona|Phoenix, AZ]], [[USA]]
| {{flagicon|USA}} TBD (mid-USA){{ref|rw2|N2}}
| align=right | 30&nbsp;hrs&nbsp;(planned)
| align=right | {{convert|2030|km|nmi|disp=flip|abbr=on}}&nbsp;(planned)
| align=right | <!-- Calculated speed -->
| align=right | <!-- Maximum altitude -->
|<ref name=SolarImpulse10>{{cite web|title=Leg 10 of 13 – Phoenix, USA to Mid-USA |url=http://www.solarimpulse.com/leg-10-from-Phoenix-to-Mid_USA|publisher=Solar Impulse}}</ref>
|-
! 11
|
| {{flagicon|USA}} TBD (mid-USA)
| {{flagicon|USA}} [[New York]], [[USA]]
| align=right | 20&nbsp;hrs&nbsp;(planned)
| align=right | {{convert|1436|km|nmi|disp=flip|abbr=on}}&nbsp;(planned)
| align=right | <!-- Calculated speed -->
| align=right | <!-- Maximum altitude -->
|<ref>{{cite web|title=Leg 11 of 13 – Mid-USA to New York, USA |url=http://www.solarimpulse.com/leg-11-from-Mid_USA-to-New_York|publisher=Solar Impulse}}</ref>
|-
! 12
|
| {{flagicon|USA}} [[New York]], [[USA]]
| {{flagicon}} TBD (Southern Europe or Morocco)
| align=right | 120&nbsp;hrs&nbsp;(planned)
| align=right | {{convert|5739|km|nmi|disp=flip|abbr=on}}&nbsp;(planned)
| align=right | <!-- Calculated speed -->
| align=right | <!-- Maximum altitude -->
|<ref>{{cite web|title=Leg 12 of 13 – New York, USA to Europe/Africa|url=http://www.solarimpulse.com/leg-12-from-New_York-to-Europe_Africa|publisher=Solar Impulse}}</ref>
|-
! 13
|
| {{flagicon}} TBD (Southern Europe or Morocco)
| {{flagicon|UAE}} [[Abu Dhabi]], [[United Arab Emirates|UAE]]
| align=right | 120&nbsp;hrs&nbsp;(planned)
| align=right | {{convert|5845|km|nmi|disp=flip|abbr=on}}&nbsp;(planned)
| align=right | <!-- Calculated speed -->
| align=right | <!-- Maximum altitude -->
|<ref>{{cite web|title=Leg 13 of 13 – Europe/Africa to Abu Dhabi, United Arab Emirates|url=http://www.solarimpulse.com/leg-13-from-Europe_Africa-to-Abu_Dhabi|publisher=Solar Impulse}}</ref>
|}

'''Notes:'''
* {{note|rw1|N1}} — Leg 7 was planned as a 144 hour flight from [[Nanjing]], [[China]] to [[Hawaii]], USA ({{convert|9132|km|nmi|disp=flip|abbr=on}}). Deteriorating weather forced a diversion to [[Nagoya]], Japan.<ref name=Leg7/>
* {{note|rw2|N2}} — The mid-USA destination will be decided just before take-off from [[Phoenix Sky Harbor International Airport]].<ref name=SolarImpulse10/>

==See also==
{{col-begin}}
{{col-2}}
* [[Electric aircraft]]
* [[List of circumnavigations]]
* [[Solar vehicle]]
* [[Tûranor PlanetSolar]], first solar vehicle to circumnavigate the Earth
{{col-break}}

;Other solar aircraft
* [[Gossamer Penguin]]
* [[Helios Prototype]]
* [[QinetiQ Zephyr]]
* [[Solar Challenger]]
{{col-end}}

==References==
{{Reflist|2}}

==External links==
{{Commons category}}
* [http://www.solarimpulse.com Official website] and [http://www.youtube.com/watch?v=o_9oDFMiIhw&feature=share&list=UUCSjLVJs5wD_BKaQqzXwyhg YouTube channel]
* [http://www.ted.com/talks/bertrand_piccard_s_solar_powered_adventure.html "Bertrand Piccard's solar-powered adventure"] – lecture at [[TED (conference)|TED]] (17 min). July 2009
* [http://www.cbsnews.com/video/watch/?id=50136262n "Solar-powered plane aims to fly around the world"]. ''[[60 Minutes]]''. [[CBS News]]. December 2012
* [http://www.howitworksdaily.com/news/how-does-the-solar-impulse-plane-work/ "How does Solar Impulse work?"] [[How It Works Magazine|''How It Works'']]. 13 May 2011
* [http://news.bbc.co.uk/1/hi/technology/8394881.stm "Record-attempting solar powered plane's first 'hop']". [[BBC]]. 4 December 2009
* [http://news.bbc.co.uk/2/hi/science_and_environment/10534960.stm "Solar Impulse plane starts 24-hour test flight"] . BBC. 7 July 2010

{{Portal bar|Aviation|Renewable energy|Energy|Switzerland}}

[[Category:Aircraft manufactured in Switzerland]]
[[Category:Solar-powered aircraft]]
[[Category:Swiss experimental aircraft]]
[[Category:2009 introductions]]
[[Category:2009 in science]]
[[Category:2013 in science]]
[[Category:2013 in California]]
[[Category:Solar power in Switzerland]]
[[Category:Four-engined aircraft]]
[[Category:Electric aircraft]]

Revision as of 14:30, 3 July 2015

lag

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