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  2. Rotary woofer - Wikipedia

    en.wikipedia.org/wiki/Rotary_woofer

    A rotary woofer is a subwoofer-style loudspeaker which reproduces very-low-frequency content by using a conventional speaker voice coil's motion to change the pitch (angle) of the blades of an impeller rotating at a constant speed. The pitch of the fan blades is controlled by the audio signal presented to the voice coil, and is able to swing ...

  3. 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 ...

  4. 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]

  5. Rolls-Royce Trent 900 - Wikipedia

    en.wikipedia.org/wiki/Rolls-Royce_Trent_900

    The Trent 900 is an axial flow, high bypass turbofan with the three coaxial shafts of the Rolls-Royce Trent family. The 2.95 m (116 in) fan with swept blades is driven by a 5-stage LP turbine, the 8-stage IP compressor and the 6-stage HP compressor are both powered by a single stage turbine, with the HP spool rotating in the opposite direction of the others.

  6. Heavy-lift launch vehicle - Wikipedia

    en.wikipedia.org/wiki/Heavy-lift_launch_vehicle

    A heavy-lift launch vehicle (HLV) is an orbital launch vehicle capable of lifting payloads between 20,000 to 50,000 kg (44,000 to 110,000 lb) (by NASA classification) or between 20,000 to 100,000 kilograms (44,000 to 220,000 lb) (by Russian classification) [1] into low Earth orbit (LEO). [2]

  7. 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.

  8. Rotorcraft - Wikipedia

    en.wikipedia.org/wiki/Rotorcraft

    For vertical and low-speed flight, the main airfoil is tip-driven as a helicopter's rotor by exhaust from a jet engine, and there is no need for a tail rotor. In high-speed flight the airfoil is stopped in a spanwise position, as the main wing of a three-surface aircraft , and the engine exhausts through an ordinary jet nozzle.

  9. 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.

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