A solar plane on an around-the-world journey has reached the point of no return over the Pacific Ocean after departing Hawaii, and now it is California or bust.
The plane was cruising over the cold northern Pacific late on Thursday at about 6,000m with a nearly-full battery as night descended, according to the Web site that’s documenting the journey of Solar Impulse 2 (Si2).
After some uncertainty about winds, the plane took off from Hawaii and was on course to land in Mountain View, California, in about three days. The crew that helped it take off was clearing out of its Hawaiian hangar and headed for the mainland for the weekend arrival.
Photo: AFP
Pilot Bertrand Piccard is flying this leg of the journey.
“We have passed the point of no return,” the team wrote on the Web site. “From this point onwards, Bertrand Piccard will only be moving forward with Si2.”
At one point the plane was passed by a Hawaiian Air jet whose passengers caught a glimpse of the Solar Impulse 2 before the powerful airliner left the slow-moving aircraft behind.
The aircraft landed in Hawaii in July last year and was forced to stay in the islands after the plane’s battery system sustained heat damage on its trip from Japan.
The aircraft started its journey in March last year from Abu Dhabi, the capital of the United Arab Emirates, and made stops in Oman, Myanmar, China and Japan. It is on the ninth leg of its circumnavigation.
Piccard, who is flying the latest leg of the trip, said the idea of crossing the ocean in a solar-powered plane a few years ago stressed him out, but on Thursday he was confident things would go according to plan.
Piccard also said the destination in the heart of Silicon Valley, California, is fitting.
He said on his way to the airfield that the plane would land “in the middle of the pioneering spirit.” Piccard’s co-pilot Andre Borschberg, who flew the leg from Japan to Hawaii, told Piccard he greatly admires his dedication and strength.
The team was delayed in Asia, as well. When first attempting to fly from Nanjing, China, to Hawaii, the crew had to divert to Japan because of unfavorable weather and a damaged wing.
A month later, when weather conditions were right, the plane departed from Nagoya, Japan, in central Japan for Hawaii.
The trans-Pacific leg is the riskiest part of the plane’s global travels due to the lack of emergency landing sites.
The plane’s ideal flight speed is about 45kph, though that can double during the day when the sun’s rays are strongest. The carbon-fiber aircraft weighs more than 2.5 tonnes, or about as much as a midsize truck.
The wings of Solar Impulse 2, which stretch wider than those of a Boeing 747, are equipped with 17,000 solar cells that power propellers and charge batteries. The plane runs on stored energy at night.
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