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  2. Propeller (aeronautics) - Wikipedia

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

    In aeronautics, an aircraft propeller, also called an airscrew, [1][2] converts rotary motion from an engine or other power source into a swirling slipstream which pushes the propeller forwards or backwards. It comprises a rotating power-driven hub, to which are attached several radial airfoil -section blades such that the whole assembly ...

  3. Ground-adjustable propeller - Wikipedia

    en.wikipedia.org/wiki/Ground-adjustable_propeller

    Ground-adjustable propeller. A ground adjustable propeller on a Rotax 912S engine, mounted in a 3Xtrim 3X55 Trener. A ground-adjustable propeller is a simple type of aircraft variable-pitch propeller where the blade angle can be adjusted between pre-set limits of fine and coarse pitch. [ 1] As its name implies, a ground-adjustable propeller may ...

  4. Blade pitch - Wikipedia

    en.wikipedia.org/wiki/Blade_pitch

    In aeronautics, blade pitch refers to the angle of the blades of an aircraft propeller or helicopter rotor. Blade pitch is measured relative to the aircraft body. It is usually described as "fine" or "low" for a more vertical blade angle, and "coarse" or "high" for a more horizontal blade angle. Blade pitch is normally described as a ratio of ...

  5. P-factor - Wikipedia

    en.wikipedia.org/wiki/P-factor

    P-factor, also known as asymmetric blade effect and asymmetric disc effect, is an aerodynamic phenomenon experienced by a moving propeller, [1] wherein the propeller's center of thrust moves off-center when the aircraft is at a high angle of attack. This shift in the location of the center of thrust will exert a yawing moment on the aircraft ...

  6. Variable-pitch propeller (aeronautics) - Wikipedia

    en.wikipedia.org/wiki/Variable-pitch_propeller...

    When an aircraft is stationary with the propeller spinning (in calm air), the relative wind vector for each propeller blade is from the side. However, as the aircraft starts to move forward, the relative wind vector comes increasingly from the front. The propeller blade pitch must be increased to maintain optimum angle of attack to the relative ...

  7. Blade element theory - Wikipedia

    en.wikipedia.org/wiki/Blade_element_theory

    Consider the element at radius r, shown in Fig. 1, which has the infinitesimal length dr and the width b. The motion of the element in an aircraft propeller in flight is along a helical path determined by the forward velocity V of the aircraft and the tangential velocity 2πrn of the element in the plane of the propeller disc, where n represents the revolutions per unit time.

  8. Thrust reversal - Wikipedia

    en.wikipedia.org/wiki/Thrust_reversal

    Thrust reversal, also called reverse thrust, is the temporary diversion of an aircraft engine 's thrust for it to act against the forward travel of the aircraft, providing deceleration. Thrust reverser systems are featured on many jet aircraft to help slow down just after touch-down, reducing wear on the brakes and enabling shorter landing ...

  9. Propeller theory - Wikipedia

    en.wikipedia.org/wiki/Propeller_theory

    The blade element theory (BET) is a mathematical process originally designed by William Froude father of Robert Edmund Froude (1878), David W. Taylor (1893) and Stefan Drzewiecki to determine the behaviour of propellers. It involves breaking an airfoil down into several small parts then determining the forces on them.

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