File:XV-15 tilt rotor aircraft on VTOL stand (4996528206).jpg
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DescriptionXV-15 tilt rotor aircraft on VTOL stand (4996528206).jpg |
English: The XV-15 tilt rotor aircraft undergoing tests on the VTOL stand. This allowed the engine and rotor system to undergo realistic testing before being committed to actual free flight. The XV-15s, manufactured by Bell, were involved in limited research at NASA/Dryden 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. |
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Source | https://www.dfrc.nasa.gov/Gallery/Photo/XV-15/HTML/ECN-13840.html; see also https://www.flickr.com/photos/nasacommons/4996528206/ |
Author | NASA/Dryden |
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NASA on The Commons @ Flickr Commons |
This image or video was catalogued by Armstrong Flight Research Center of the United States National Aeronautics and Space Administration (NASA) under Photo ID: ECN-13840. This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing. Other languages:
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This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ||
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current | 18:12, 8 February 2021 | 3,000 × 2,363 (984 KB) | Huntster (talk | contribs) | Cropped 15 % vertically using CropTool with lossless mode. | |
17:06, 27 September 2015 | 3,000 × 2,764 (1.1 MB) | Sumita Roy Dutta (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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