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  2. Union Pacific 9000 Class - Wikipedia

    en.wikipedia.org/wiki/Union_Pacific_9000_Class

    The Union Pacific 9000 class was the only class of steam locomotives with a 4-12-2 wheel arrangement ever to be built, also the 9000 class was the largest rigid frame locomotive ever built. Under the Whyte notation for the classification of steam locomotives , the locomotives had four leading wheels , twelve coupled driving wheels , and two ...

  3. Rotorcraft - Wikipedia

    en.wikipedia.org/wiki/Rotorcraft

    Some rotary wing aircraft are designed to stop the rotor for forward flight so that it then acts as a fixed wing. For vertical flight and hovering it spins to act as a rotary wing or rotor, and for forward flight at speed it stops to act as a fixed wing providing some or all of the lift required. Additional fixed wings may also be provided to ...

  4. Retreating blade stall - Wikipedia

    en.wikipedia.org/wiki/Retreating_blade_stall

    Retreating blade stall is a hazardous flight condition in helicopters and other rotary wing aircraft, where the retreating rotor blade has a lower relative blade speed, combined with an increased angle of attack, causing a stall and loss of lift.

  5. Ford L series - Wikipedia

    en.wikipedia.org/wiki/Ford_L_series

    The Ford L-series is a range of commercial trucks that were assembled and marketed by Ford between 1970 and 1998. The first dedicated Class 8 conventional truck developed by the company, the L-Series was colloquially named the "Louisville Line", denoting the Kentucky Truck Plant that assembled the trucks. [1]

  6. Helicopter rotor - Wikipedia

    en.wikipedia.org/wiki/Helicopter_rotor

    On a helicopter, the main rotor or rotor system is the combination of several rotary wings (rotor blades) with a control system, that generates the aerodynamic lift force that supports the weight of the helicopter, and the thrust that counteracts aerodynamic drag in forward flight.

  7. Boeing Rotorcraft Systems - Wikipedia

    en.wikipedia.org/wiki/Boeing_Rotorcraft_Systems

    Boeing Rotorcraft Systems (formerly Boeing Helicopters and before that Boeing Vertol) is the former name of an American aircraft manufacturer, now known as Vertical Lift division of Boeing Defense, Space & Security. The headquarters and main rotorcraft factory is in Ridley Park, Pennsylvania, a suburb of Philadelphia.

  8. Pratt & Whitney PW4000 - Wikipedia

    en.wikipedia.org/wiki/Pratt_&_Whitney_PW4000

    The Pratt & Whitney PW4000 is a family of dual-spool, axial-flow, high-bypass turbofan aircraft engines produced by Pratt & Whitney as the successor to the JT9D.It was first run in April 1984, was FAA certified in July 1986, and was introduced in June 1987.

  9. International 9000 - Wikipedia

    en.wikipedia.org/wiki/International_9000

    The International 9000 Series is a range of trucks that was manufactured by Navistar International (previously International Harvester) from 1971 to 2017. A conventional-cab truck , the model range was configured primarily for highway applications.

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