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  2. Helicopter rotor - Wikipedia

    en.wikipedia.org/wiki/Helicopter_rotor

    An example of two-blade rotor is the Bell 212, and four blade version of this helicopter is the Bell 412. [23] An example of the effect of rotor blade number is the UH-72 ( EC145 variant ); the A model had four blades, but the UH-72B was changed to five blades which reduced vibration. [ 24 ]

  3. Tail rotor - Wikipedia

    en.wikipedia.org/wiki/Tail_rotor

    The tail rotor system rotates airfoils, small wings called blades, that vary in pitch in order to vary the amount of thrust they produce.The blades most often utilize a composite material construction, such as a core made of aluminum honeycomb or plasticized paper honeycomb, covered in a skin made of aluminum or carbon fiber composite.

  4. Twist-beam rear suspension - Wikipedia

    en.wikipedia.org/wiki/Twist-beam_rear_suspension

    The twist-beam rear suspension (also torsion-beam axle, deformable torsion beam, or compound crank) is a type of automobile suspension based on a large H- or C-shaped member. The front of the H attaches to the body via rubber bushings , and the rear of the H carries each stub-axle assembly, on each side of the car.

  5. Bell 222/230 - Wikipedia

    en.wikipedia.org/wiki/Bell_222/230

    The main rear landing gear retracts into the sponsons. [2] The Bell 222's rotor systems include: Two-blade, semi-rigid high-kinetic energy main rotor with preconing and underslinging. The rotor head incorporates elastomeric bearings for hub springs, and flapping and pitch change bearings. The system is similar in design to that used by the AH-1 ...

  6. NOTAR - Wikipedia

    en.wikipedia.org/wiki/NOTAR

    The Fiat 7005 used a pusher propeller that blew against a cascade of tail vanes at the rear of its fuselage. Development of the NOTAR system dates back to 1975, when engineers at Hughes Helicopters began concept development work. [2] On December 17, 1981, Hughes flew an OH-6A fitted with NOTAR for the first time. The OH-6A helicopter (serial ...

  7. Flapback - Wikipedia

    en.wikipedia.org/wiki/Flapback

    At the same time, the rearward-moving rotor blade flaps down thereby increasing its angle of attack and lift. Thus, lift is balanced on both sides of the rotor disc. However, since the rotor blades climb on the advancing side and descend on the opposite side, this also results in the rotor disk being tilted to the rear.

  8. Box blade - Wikipedia

    en.wikipedia.org/wiki/Box_blade

    A box blade is a type of implement used on tractors for smoothing and contouring land. ... with uses that parallel that of a rear blade, but are distinct. They ...

  9. Propeller (aeronautics) - Wikipedia

    en.wikipedia.org/wiki/Propeller_(aeronautics)

    Thin blade sections are used and the blades are swept back in a scimitar shape (scimitar propeller) in a manner similar to wing sweepback, so as to delay the onset of shockwaves as the blade tips approach the speed of sound. The maximum relative velocity is kept as low as possible by careful control of pitch to allow the blades to have large ...

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