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  2. Fifth-wheel coupling - Wikipedia

    en.wikipedia.org/wiki/Fifth-wheel_coupling

    The fifth-wheel coupling provides the link between a semi-trailer and the towing truck, tractor unit, leading trailer or dolly. The coupling consists of a kingpin, a 2-or- -inch-diameter (50.8 or 88.9 mm) vertical steel pin protruding from the bottom of the front of the semi-trailer, and a horseshoe-shaped coupling device called a fifth wheel ...

  3. Apollo 11 - Wikipedia

    en.wikipedia.org/wiki/Apollo_11

    Apollo 11 (July 16–24, 1969) was the American spaceflight that first landed humans on the Moon. Commander Neil Armstrong and Lunar Module Pilot Buzz Aldrin landed the Apollo Lunar Module Eagle on July 20, 1969, at 20:17 UTC, and Armstrong became the first person to step onto the Moon's surface six hours and 39 minutes later, on July 21 at 02: ...

  4. George Walther Sr. - Wikipedia

    en.wikipedia.org/wiki/George_Walther_Sr.

    George Walther Sr. (August 13, 1876 – April 10, 1961) was an American inventor, engineer, businessman, civic leader and the holder of over 100 patents for truck wheels, brake drums, fifth wheels, and landing gear/legs for the trucking industry. He was the founder of the Dayton Steel Foundry. Walther developed the first practical cast steel ...

  5. Spacecraft flight dynamics - Wikipedia

    en.wikipedia.org/wiki/Spacecraft_flight_dynamics

    Flight path of the Apollo 11 human lunar landing mission, July 1969. Spacecraft flight dynamics is the application of mechanical dynamics to model how the external forces acting on a space vehicle or spacecraft determine its flight path. These forces are primarily of three types: propulsive force provided by the vehicle's engines; gravitational ...

  6. STS-61 - Wikipedia

    en.wikipedia.org/wiki/STS-61

    STS-61 was NASA 's first Hubble Space Telescope servicing mission, and the fifth flight of the Space Shuttle Endeavour. The mission launched on December 2, 1993, from Kennedy Space Center (KSC) in Florida. The mission restored the spaceborne observatory's vision (marred by spherical aberration in its mirror) with the installation of a new main ...

  7. Undercarriage arrangements - Wikipedia

    en.wikipedia.org/wiki/Undercarriage_arrangements

    This table shows the main types of individual, basic wheeled units (single-wheel unit or bogies composed of multiple wheels) used on most aircraft undercarriages. Symbol. Wheeled unit. Example. 2 wheels, 1 axle. Airbus A380 nose landing gear (consisting of a single 2-wheel bogie) 4 wheels, 2 axles. An Airbus A330 's main landing gear ...

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