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The YF-20 is a Chinese liquid-fuel rocket engine burning N 2 O 4 and UDMH in a gas generator cycle. It is a basic engine which when mounted in a four engine module forms the YF-21 . The high altitude variation is known as the YF-22 is normally paired with the YF-23 vernier to form the YF-24 propulsion module for second stages.
The YF-90 is a liquid cryogenic rocket engine burning liquid hydrogen and liquid oxygen in a staged combustion cycle. It is China's first hydrogen-oxygen engine to use the staged combustion cycle and is expected to be used for the second stage of the Long March 9, which is a three-stage rocket with boosters.
The General Electric YF120, internally designated as GE37, was a variable cycle afterburning turbofan engine designed by General Electric Aircraft Engines in the late 1980s and early 1990s for the United States Air Force's Advanced Tactical Fighter (ATF) program. It was designed to produce maximum thrust in the 35,000 lbf (156 kN) class.
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President Joe Biden has ordered that U.S. flags on federal government buildings and property will be lowered to half staff for five days in recognition of former first lady Rosalynn Carter, who ...
Despite this, the designations YF-17 and YF-23 were not skipped (although F-20, YF-17 and YF-23 all were prototypes and did not enter production phase). [2] The United States received the first Lockheed F-117 Nighthawk stealth attack aircraft in 1982. During the decade many news articles discussed what they called the "F-19".