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2. Variable-pitch propeller (aeronautics) - Wikipedia

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

   A propeller with adjustable blade angle is more efficient over a range of conditions. A propeller with variable pitch can have a nearly constant efficiency over a range of airspeeds. [1] A shallower angle of attack requires the least torque, but the highest RPM, because the propeller is not moving very much air with each revolution.

3. Kaplan turbine - Wikipedia

   en.wikipedia.org/wiki/Kaplan_turbine

   A Bonneville Dam Kaplan turbine after 61 years of service. The Kaplan turbine is a propeller-type water turbine which has adjustable blades. It was developed in 1913 by Austrian professor Viktor Kaplan, [1] who combined automatically adjusted propeller blades with automatically adjusted wicket gates to achieve efficiency over a wide range of flow and water level.

4. Spinner (aeronautics) - Wikipedia

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

   A fan from a Rolls-Royce RB211 turbofan engine, with its spinner visible at the centre of the fan blades.. The first spinners were fitted to aircraft in the early 1910s, originally to reduce drag caused by the large-diameter rotary engines of that era, and also were prominent on World War I-era aircraft, like the Morane-Saulnier N French monoplane fighter, and for the Central Powers, Robert ...

5. 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 ...

6. List of Saber Interactive games - Wikipedia

   en.wikipedia.org/wiki/List_of_Saber_Interactive...

   Saber Interactive: Planet Entertainment [17] Road Redemption: Nintendo Switch: November 6, 2018: Saber Interactive: Tripwire Interactive [18] PlayStation 4: Spintires: MudRunner - American Wilds: Nintendo Switch: November 27, 2018: Saber Interactive: Focus Home Interactive [19] Road Redemption: Xbox One: December 19, 2018: Saber Interactive ...

7. Contra-rotating propellers - Wikipedia

   en.wikipedia.org/wiki/Contra-rotating_propellers

   Contra-rotating propellers Contra-rotating propellers on the Rolls-Royce Griffon-powered P-51XR Mustang Precious Metal at the 2014 Reno Air Races. Aircraft equipped with contra-rotating propellers (CRP) [1] coaxial contra-rotating propellers, or high-speed propellers, apply the maximum power of usually a single piston engine or turboprop engine to drive a pair of coaxial propellers in contra ...

8. Propeller - Wikipedia

   en.wikipedia.org/wiki/Propeller

   The blades are the foil section plates that develop thrust when the propeller is rotated The hub is the central part of the propeller, which connects the blades together and fixes the propeller to the shaft. This is called the boss in the UK. Rake is the angle of the blade to a radius perpendicular to the shaft.

9. Helicopter rotor - Wikipedia

   en.wikipedia.org/wiki/Helicopter_rotor

   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] Other blade numbers are possible, for example, the CH-53K , a large military transport helicopter has a seven blade main rotor.