Editing Centennial Challenges (section)

===Green Flight Challenge===
[[Image:Pipistrel Taurus G4 taxiing at 2011 Green Flight Challenge.jpg|thumb|[[Pipistrel Taurus]] G4, the 2011 Green Flight Challenge winning aircraft of Pipistrel USA.com team, taxiing at the event.]]

The Green Flight Challenge sponsored by Google is to build an aircraft which can fly 200 miles in under two hours using the energy equivalent of a gallon of gasoline per passenger. The US$1,650,000 prize was competed for Sept 25 - Oct 1, 2011 at the Charles M. Schulz Sonoma County Airport, Santa Rosa, California. The CAFE Foundation<ref>[http://cafefoundation.org/v2/gfc_main.php CAFE Foundation]</ref> was the Allied Organization which partnered with NASA's Centennial Challenges Program<ref>{{cite web |title=Centennial Challenges |website=[[NASA]] |archive-url=https://web.archive.org/web/20221209115246/https://www.nasa.gov/challenges/ |archive-date=2022-12-09 |url-status=live |url=http://www.nasa.gov/challenges}}</ref> to conduct the challenge. On October 1, 2011, CAFE had a competition open house for the public to see the aircraft and meet the competing teams. The Google Green Flight Challenge Exposition<ref>[http://cafefoundation.org/v2/gfc_2011_GFE_main.php Google Green Flight Challenge Exposition hosted by NASA] {{webarchive |url=https://web.archive.org/web/20110926115723/http://cafefoundation.org/v2/gfc_2011_GFE_main.php |date=September 26, 2011 }}</ref> was at NASA Ames Research Center in Sunnyvale, California on October 3, 2011. Free admission tickets were available at the Expo website.<ref>[http://cafefoundation.org/v2/gfc_2011_GFE_main.php Expo website] {{webarchive |url=https://web.archive.org/web/20110926115723/http://cafefoundation.org/v2/gfc_2011_GFE_main.php |date=September 26, 2011 }}</ref>  The Expo had the competition aircraft on display, presented winner checks and additional displays of green energy technology.