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  2. Coaxial-rotor aircraft - Wikipedia

    en.wikipedia.org/wiki/Coaxial-rotor_aircraft

    A rotor blade produces more lift in the advancing half. As a blade moves toward the direction of flight, the forward motion of the aircraft increases the speed of the air flowing around the blade until it reaches a maximum when the blade is perpendicular to the relative wind. At the same time, a rotor blade in the retreating half produces less ...

  3. Contra-rotating - Wikipedia

    en.wikipedia.org/wiki/Contra-rotating

    Contra-rotating, also referred to as coaxial contra-rotating, is a technique whereby parts of a mechanism rotate in opposite directions about a common axis, usually to minimise the effect of torque. Examples include some aircraft propellers , resulting in the maximum power of a single piston or turboprop engine to drive two propellers in ...

  4. Pratt & Whitney/Allison 578-DX - Wikipedia

    en.wikipedia.org/wiki/Pratt_&_Whitney/Allison_578-DX

    In addition, the blades and the coaxial propellers on the 578-DX were inspired by the SR-7 single-rotation fan on the 501-M78 and the NASA-studied CRP-X1, [57] a 2 ft contra-rotating (0.61 m; 24 in; 61 cm) model propfan with a 5x5 blade configuration. [58]

  5. Helicopter rotor - Wikipedia

    en.wikipedia.org/wiki/Helicopter_rotor

    At the top of the mast is the attachment point (colloquially called a Jesus nut) for the rotor blades called the hub. The rotor blades are then attached to the hub, and the hub can have 10-20 times the drag of the blade. [1] Main rotor systems are classified according to how the main rotor blades are attached and move relative to the main rotor ...

  6. Breguet G.111 - Wikipedia

    en.wikipedia.org/wiki/Breguet_G.111

    Though a much larger aircraft, the G.11E used the same coaxial, three blade twin rotor layout as on the Gyroplane Laboratoire. It was initially powered by a fan cooled 179 kW (240 hp) Potez 9E nine cylinder radial engine mounted amidships, under the concentric rotor shafts. There was 6.5:1 speed reduction gearing between the engine and the ...

  7. Fenestron - Wikipedia

    en.wikipedia.org/wiki/Fenestron

    By placing the fan within a duct, several distinct advantages over a conventional tail rotor are obtained, such as a reduction in tip vortex losses and the potential for substantial noise reduction, while also shielding both the tail rotor itself from collision damage and ground personnel from the hazard posed by a traditional spinning rotor ...

  8. Are the Chiefs the NFL's worst-ever 9-0 team? - AOL

    www.aol.com/sports/chiefs-nfls-worst-ever-9...

    Seven of Kansas City’s nine wins have come by a single score. Four have been in doubt until the final play of the game. It started back in September when the Chiefs beat the Ravens by a big toe ...

  9. Tandem-rotor aircraft - Wikipedia

    en.wikipedia.org/wiki/Tandem-rotor_aircraft

    This is commonly accomplished by a tail rotor, coaxial rotors, and the NOTAR systems. Tandem-rotor helicopters, however, use counter-rotating rotors, with each cancelling out the other's torque. Therefore, all of the power from the engines can be used for lift, whereas a single-rotor helicopter uses some of the engine power to counter the ...

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