The Solar Impulse took off early this morning for a 24-hour test flight from an airfield in Payerne, Switzerland, approximately 80 miles northeast of Geneva.  Andre Borschberg, the pilot, will fly the plane at 28,000 feet throughout the day.

We reported on early test flights  of this solar plane here and here.

UPDATE - Success!  The Solar Impulse lands after 26 hours.

Further reading

http://www.washingtonpost.com/wp-dyn/content/video/2010/07/08/VI2010070802780.html

http://www.solarimpulse.com/common/documents/news_affich.php?lang=en&group=news&IdArticle=71

http://edition.cnn.com/2010/TECH/innovation/07/07/solar.plane.test.flight/

http://greenlegals.com/2010/04/solar-impulses-successful-solar-powered-test-flight/

http://greenlegals.com/2010/01/solar-impulse-an-aircraft-powered-by-the-sun/

Video: http://www.youtube.com/watch?v=_nowxBfRb7g

KJC