Dieses Bild kann kleinere Mängel aufweisen, da es sich um ein historisches Bild oder ein Reportagebild handel
This view of the Helios Prototype from a chase helicopter shows abnormally high wing dihedral of more than 30 feet from wingtip to the center of the aircraft that resulted after the Helios entered moderate air turbulence on its last test flight. The extreme dihedral caused aerodynamic instability that led to an uncontrollable series of pitch oscillations and overspeed conditions, resulting in structural failures and partial breakup of the aircraft. The Helios Prototype achieved the first of the two goals by reaching an unofficial world-record altitude of 96, 863 feet and sustaining flight above 96, 000 feet for more than 40 minutes. The Helios Prototype is a remotely piloted flying wing aircraft developed under NASA's Environmental Research Aircraft and Sensor Technology (ERAST) project. The two primary goals of the Helios Prototype development are to demonstrate sustained flight at an altitude near 100, 000 feet and flying non-stop for at least 24 hours, including at least 14 hours above 50, 000 feet.