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On 3 July 2015, Si2 landed in Hawaii after a record breaking flight of five days and nights (117 hours and 52 minutes) and around 8’900km from Japan, accomplished by André Borschberg. During this flight, the airplane suffered battery damage due to overheating which led to an unforeseen pause in the adventure – it was going to take the team more time to replace the batteries than the remaining time left before the end of the season with long enough days, and short enough nights, to continue the Round-The-World Flight. 

“As we experienced many times with Solar Impulse, obstacles often turn out to be opportunities for improvement,” explained André Borschberg, CEO and Co-Founder. “Ultimately, this time was used to recreate the strong mindset within the team to continue our adventure. It takes sometimes more time to build up the right spirit then to develop new technologies.” 

Solar Impulse was fortunate to find a shelter to protect the airplane during the winter on Kalaeloa airport, thanks to the University of Hawaii, the Honolulu Community College and the Department of Transportation, and received valuable support from many people and institutions, such as the Governor of Hawaii, the authorities of Kalaeloa and Honolulu airports, and the Swiss Consulate. 

Between late February and mid-April 2016, Si2 accomplished a total of 13 flights. Maintenance flights, carried out by Solar Impulse’s test pilot, confirmed the good performance of the aircraft and proper functioning of the newly integrated cooling system, installed to safeguard the batteries from temperature-related glitches. They were followed by a series of training flights completed by both pilots: André Borschberg and Bertrand Piccard, including a high altitude flight, in order to prepare for the remainder of the Pacific crossing (watch the video here). 

“An airplane with perpetual flight endurance, without fuel, like the Solar Impulse is not only a first in the history of aviation, but also in the history of energy,” emphasized Bertrand Piccard, Initiator and Chairman of the project. “The primary purpose of this adventure is to demonstrate that modern clean technologies can achieve the impossible and encourage everyone to use these same energy efficient solutions on the ground in their daily lives for mobility, construction, lighting, heating, cooling and more.” 

When the weather is right, Si2 will resume its Round-The-World Solar Flight and take off for North America with Bertrand Piccard at the controls. The team is examining four potential destinations: Phoenix, the San Francisco area, Los Angeles and Vancouver. Based on the learnings of 2015, the decision was made to expand the range of potential destinations to leave a maximum flexibility for route planning. 

The final landing place will be chosen a couple of days before departure depending on the weather conditions. The mission will then continue onward to New York, Europe or North Africa and Abu Dhabi where it all started. 

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