Extract from Gulfstream Press release
The G650 struck its right wingtip on the ground as it took off from Roswell International Air Center around 9:30 a.m. local time, following high speed taxi testing. The plane then hit the ground, causing the landing gear to collapse, and skidded along the runway before catching fire and coming to rest only 40 feet from the control tower. The takeoff was the 10th of the day and was part of the testing of takeoff performance and brake systems.