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  2. Tumansky R-25 - Wikipedia

    en.wikipedia.org/wiki/Tumansky_R-25

    An unusual addition to the R-25 was an emergency mode thrust boost which increased the compressor speed to 106% and also increased the afterburner fuel flow with the addition of a second afterburner fuel pump. Thrust was increased to 96.5 kilonewtons (21,700 lb f) below an altitude of 2,000 metres (6,600 ft). The time limit for its use was 1 ...

  3. Mach number - Wikipedia

    en.wikipedia.org/wiki/Mach_number

    As a flow in a channel becomes supersonic, one significant change takes place. The conservation of mass flow rate leads one to expect that contracting the flow channel would increase the flow speed (i.e. making the channel narrower results in faster air flow) and at subsonic speeds this holds true. However, once the flow becomes supersonic, the ...

  4. Open-channel flow - Wikipedia

    en.wikipedia.org/wiki/Open-channel_flow

    Varied flow. The depth of flow changes along the length of the channel. Varied flow technically may be either steady or unsteady. Varied flow can be further classified as either rapidly or gradually-varied: Rapidly-varied flow. The depth changes abruptly over a comparatively short distance. Rapidly varied flow is known as a local phenomenon.

  5. 2.25-Inch Sub-Caliber Aircraft Rocket - Wikipedia

    en.wikipedia.org/wiki/2.25-Inch_Sub-Caliber...

    The 2.25-Inch Sub-Caliber Aircraft Rocket, or SCAR, was an American unguided rocket developed by the United States Navy during World War II and used for sub-caliber rocket training.

  6. Lockheed Martin F-22 Raptor - Wikipedia

    en.wikipedia.org/wiki/Lockheed_Martin_F-22_Raptor

    The Lockheed Martin/Boeing F-22 Raptor is an American twin-engine, all-weather, supersonic stealth fighter aircraft.As a product of the United States Air Force's Advanced Tactical Fighter (ATF) program, the aircraft was designed as an air superiority fighter, but also incorporates ground attack, electronic warfare, and signals intelligence capabilities.

  7. List of countries by past fertility rate - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_past...

    This is a list of countries showing past fertility rate, ranging from 1950 to 2015 in five-year periods, as estimated by the 2017 revision of the World Population Prospects database by the United Nations Population Division. The fertility rate equals the expected number of children born per woman in her child-bearing years.