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2. Fan (machine) - Wikipedia

   en.wikipedia.org/wiki/Fan_(machine)

   A household electric fan A large cylindrical fan. A fan is a powered machine that creates airflow. A fan consists of rotating vanes or blades, generally made of wood, plastic, or metal, which act on the air. The rotating assembly of blades and hub is known as an impeller, rotor, or runner. Usually, it is contained within some form of housing ...

3. List of tallest freestanding structures - Wikipedia

   en.wikipedia.org/wiki/List_of_tallest...

   This is a list of tallest freestanding structures in the world past and present. To be freestanding a structure must not be supported by guy wires , the sea or other types of auxiliary support. It therefore does not include guyed masts , partially guyed towers and drilling platforms but does include towers , skyscrapers ( pinnacle height) and ...

4. Industrial fan - Wikipedia

   en.wikipedia.org/wiki/Industrial_fan

   The axial fan is often contained within a short section of cylindrical ductwork, to which inlet and outlet ducting can be connected. Axial fan types have fan wheels with diameters that usually range from less than a foot (0.3 meters) to over 30 feet (9.1 m), although axial cooling tower fan wheels may exceed 82 feet (25 m) in diameter.

5. Stand-alone power system - Wikipedia

   en.wikipedia.org/wiki/Stand-alone_power_system

   Start-up: High current drawn by some loads during start-up Current spikes during the start-up can overload the system temporarily. Reactive power: The circulating current can differ from the current consumed when capacitive or inductive loads are used. Harmonic distortion: Non-linear loads may create distortion of the inverter waveform.

6. Speed climbing - Wikipedia

   en.wikipedia.org/wiki/Speed_climbing

   Speed climbing is a climbing discipline in which speed is the ultimate goal. [1] Speed climbing is done on rocks, walls and poles and is only recommended for highly skilled and experienced climbers.

7. Stairclimber - Wikipedia

   en.wikipedia.org/wiki/Stairclimber

   Stairclimber wheels. A stairclimber is a type of trolley fitted with rotating wheels or tracks so that it can be pushed or pulled up or down steps or a stairway.Stairclimbers can be manual or battery-powered, and are commonly found in wheel, track, push arm or walker variants.