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  2. Turboprop - Wikipedia

    en.wikipedia.org/wiki/Turboprop

    Schematic diagram showing the operation of a turboprop engine Propulsive efficiency for different engine types and Mach numbers. Exhaust thrust in a turboprop is sacrificed in favor of shaft power, which is obtained by extracting additional power (beyond that necessary to drive the compressor) from turbine expansion.

  3. Propeller - Wikipedia

    en.wikipedia.org/wiki/Propeller

    A propeller (often called a ... with the help of clock maker, engraver, ... The pitch diagram shows variation of pitch with radius from root to tip. The transverse ...

  4. Propeller (aeronautics) - Wikipedia

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

    A 6-bladed Hamilton Standard 568F propeller on an ATR 72 short-haul airliner. Lowry [27] quotes a propeller efficiency of about 73.5% at cruise for a Cessna 172.This is derived from his "Bootstrap approach" for analyzing the performance of light general aviation aircraft using fixed pitch or constant speed propellers.

  5. Variable-pitch propeller (aeronautics) - Wikipedia

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

    A constant-speed propeller is a variable-pitch propeller that automatically changes its blade pitch in order to maintain a chosen rotational speed, regardless of the operational conditions of the aircraft. This is achieved by use of a constant-speed unit (CSU) or propeller governor, which automatically changes the propeller's blade pitch.

  6. Aircraft engine starting - Wikipedia

    en.wikipedia.org/wiki/Aircraft_engine_starting

    Hand starting of aircraft piston engines by swinging the propeller is the oldest and simplest method, the absence of any onboard starting system giving an appreciable weight saving. Positioning of the propeller relative to the crankshaft is arranged such that the engine pistons pass through top dead centre during the swinging stroke.

  7. File:Controllable pitch propeller schematic.svg - Wikipedia

    en.wikipedia.org/wiki/File:Controllable_pitch...

    This image is a derivative work of the following images: File:Controllable_pitch_propeller_schematic.JPG licensed with PD-self . 2008-06-22T17:30:17Z Ke4roh 2128x1260 (154272 Bytes) same picture as before, just adjusted for on-screen viewing.

  8. Propeller theory - Wikipedia

    en.wikipedia.org/wiki/Propeller_theory

    The momentum theory or disk actuator theory – a theory describing a mathematical model of an ideal propeller – was developed by W.J.M. Rankine (1865), Alfred George Greenhill (1888) and Robert Edmund Froude (1889). The propeller is modelled as an infinitely thin disc, inducing a constant velocity along the axis of rotation.

  9. Toroidal propeller - Wikipedia

    en.wikipedia.org/wiki/Toroidal_propeller

    A toroidal propeller is a type of propeller that is ring-shaped with each blade forming a closed loop. The propellers are significantly quieter at audible frequency ranges, between 20 Hz and 20 kHz, while generating comparable thrust to traditional propellers. In practice, toroidal propellers reduce noise pollution in both aviation and maritime ...

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