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A fourth YF-12 aircraft, the "YF-12C", was actually the second SR-71A (AF Ser. No. 61–7951). This SR-71A was re-designated as a YF-12C and given the fictitious Air Force Serial Number 60-6937 from an A-12 to maintain SR-71 secrecy. The aircraft was loaned to NASA for propulsion testing after the loss of YF-12A (AF Ser. No. 60–6936) in 1971.
The Pratt & Whitney J58 (company designation JT11D-20) is an American jet engine that powered the Lockheed A-12, and subsequently the YF-12 and the SR-71 aircraft. It was an afterburning turbojet engine with a unique compressor bleed to the afterburner that gave increased thrust at high speeds.
The YF-12 program was a limited production variant of the A-12. Lockheed convinced the U.S. Air Force that an aircraft based on the A-12 would provide a less costly alternative to the recently canceled North American Aviation XF-108, since much of the design and development work on the YF-12 had already been done and paid for. Thus, in 1960 the ...
NASA_YF-12_Overview.ogv (Ogg multiplexed audio/video file, Theora/Vorbis, length 26 min 38 s, 604 × 360 pixels, 482 kbps overall, file size: 91.75 MB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
The "Shepherd's Crook," the original insignia authorized for U.S. Army chaplains, 1880–1888, and still included as part of the U.S. Army Chaplain Corps regimental insignia Early army chaplain uniforms used the color black as a symbol of a ministerial presence, before corps insignia had been instituted WWI Army uniform coat with Christian Chaplain insignia WWI Army dress uniform coat with ...
Spectators look up as the World Trade Center goes up in flames September 11, 2001 in New York City after two airplanes slammed into the twin towers in an alleged terrorist attack.
This list of accidents and incidents involving commercial aircraft includes notable events that have a corresponding Wikipedia article. Entries in this list involve passenger or cargo aircraft that are operating commercially and meet this list's size criteria—passenger aircraft with a seating capacity of at least 10 passengers, or commercial cargo aircraft of at least 20,000 lb (9,100 kg).
The Christian cross has traditionally been a symbol representing Christianity or Christendom as a whole, [2] and is the best-known symbol of Christianity. [2] The Christian cross was in use from the time of early Christianity , but it remained less prominent than competing symbols ( Ichthys , Staurogram , Alpha and Omega , Christogram , Labarum ...