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Fotoschätze aus dem NASA-Archiv auf flickr

XV-15 tilt rotor takeoff - first NASA Dryden flight

XV-15 tilt rotor takeoff – first NASA Dryden flight

Collection: NASA Image eXchange Collection
Title: XV-15 tilt rotor takeoff – first NASA Dryden flight

Description: This photo shows the 1st XV-15 tilt rotor flight for NASA/Dryden at the Army contingent at Edwards Air Force Base, Edwards, California, October 1980. The former XB-70 hangar can be seen to the lower right. The two smaller cutouts on each side of the tail section slot were extra modifications for the large twin-tailed plane. The Bell XV-15 Tiltrotor aircraft were involved in limited research at the Hugh L. Dryden Flight Research Center in 1980 and 1981. The development of the XV-15 Tiltrotor research aircraft was initiated in 1973 with joint Army/NASA funding as a “proof of concept”, or “technology demonstrator” program, with two aircraft being built by Bell Helicopter Textron (BHT) in 1977. NASA Ames Research Center, where most of the NASA research is conducted, continues to be in charge of the joint NASA/Army/Bell program. The aircraft are powered by twin Lycoming T-53 turboshaft engines that are connected by a cross-shaft and drive three-bladed, 25 ft diameter metal rotors (the size extensively tested in a wind tunnel). The engines and main transmissions are located in wingtip nacelles to minimize the operational loads on the cross-shaft system and, with the rotors, tilt as a single unit. For takeoff, the proprotors and their engines are used in the straight-up position where the thrust is directed downward. The XV-15 then climbs vertically into the air like a helicopter. In this VTOL mode, the vehicle can lift off and hover for approximately one hour. Once off the ground, the XV-15 has the ability to fly in one of two different modes. It can fly as a helicopter, in the partially converted airplane mode. The XV-15 can also then convert from the helicopter mode to the airplane mode. This is accomplished by continuous rotation of the proprotors from the helicopter rotor position to the conventional airplane propeller position. During the ten to fifteen second conversion period, the aircraft speed increases and lift is transferred from the rotors to the wing. To land, the proprotors are rotated up to the helicopter rotor position and flown as a helicopter to a vertical landing.

Date: 10.01.1980
Credit: NASA Dryden Flight Research Center (NASA-DFRC) [ ]

ID: ECN-13850
Original url:


Link to the complete fotostream on flickr

Fotosammlung von Karl Valentin zeigt das alte München

Stereofoto: Blick vom Maximilianeum gegen Westen 1865
Im Vordergrund Maximiliansbrücke und Isar, im Hintergrund Maximilianstraße und Silhouette der Altstadt.
Stadtarchiv München – Fotosammlung (Sammlung Valentin 1405)

“Dass Karl Valentin auch Fotos gesammelt hat, dürfte dem breiten Publikum entgangen sein. Das Münchner Stadtarchiv hat in den vergangenen Jahren den Bestand des Komikers und Volkssängers digitalisiert. Die rund 2.200 Fotos können nun im Lesesaal des Archivs abgerufen werden. Karl Valentin begann um 1925, Fotos über die Stadtgeschichte von 1855 bis 1910 zu sammeln. Mit dabei sind auch Stereoskop-Ansichten mit einem dreidimensionalen Blick auf das alte München. Im August 1939 verkaufte er die Sammlung an die Stadt und meinte besorgt, mit den ersten Wolkenkratzern beginne die Stadt gewissermaßen zu “neuyorkeln”.”
Quelle: Deutschlandradio Kultur, 2.9.2010

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