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2. Counter-rotating propellers - Wikipedia

   en.wikipedia.org/wiki/Counter-rotating_propellers

   Counter-rotating propellers (CRP) are propellers which turn in opposite directions to each other. [1] They are used on some twin- and multi- engine propeller-driven aircraft. The propellers on most conventional twin-engined aircraft turn clockwise (as viewed from behind the engine). Counter-rotating propellers generally turn clockwise on the ...

3. Helicopter rotor - Wikipedia

   en.wikipedia.org/wiki/Helicopter_rotor

   The helicopter rotor is powered by the engine, through the transmission, to the rotating mast. The mast is a cylindrical metal shaft that extends upward from—and is driven by—the transmission. At the top of the mast is the attachment point (colloquially called a Jesus nut) for the rotor blades called the hub.

4. Ceiling fan - Wikipedia

   en.wikipedia.org/wiki/Ceiling_fan

   Ceiling fan. A modern ceiling fan. A ceiling fan mid-spin. A ceiling fan is a fan mounted on the ceiling of a room or space, usually electrically powered, that uses hub-mounted rotating blades to circulate air. They cool people effectively by increasing air speed. Fans do not reduce air temperature or relative humidity, unlike air-conditioning ...

5. Clockwise - Wikipedia

   en.wikipedia.org/wiki/Clockwise

   Clockwise. Two-dimensional rotation can occur in two possible directions or senses of rotation. Clockwise motion (abbreviated CW) proceeds in the same direction as a clock 's hands relative to the observer: from the top to the right, then down and then to the left, and back up to the top. The opposite sense of rotation or revolution is (in ...

6. Propeller (aeronautics) - Wikipedia

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

   Propeller (aeronautics) The propellers of a C-130J Super Hercules military transport aircraft. 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 ...

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. Coaxial-rotor aircraft - Wikipedia

   en.wikipedia.org/wiki/Coaxial-rotor_aircraft

   Coaxial-rotor aircraft. A Ukrainian Navy Kamov Ka-27. A coaxial-rotor aircraft is an aircraft whose rotors are mounted one above the other on concentric shafts, with the same axis of rotation, but turning in opposite directions (contra-rotating). This rotor configuration is a feature of helicopters produced by the Russian Kamov helicopter ...

9. High-pressure area - Wikipedia

   en.wikipedia.org/wiki/High-pressure_area

   High-pressure area. A high-pressure area, high, or anticyclone, is an area near the surface of a planet where the atmospheric pressure is greater than the pressure in the surrounding regions. Highs are middle-scale meteorological features that result from interplays between the relatively larger-scale dynamics of an entire planet's atmospheric ...