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Air naturally stratifies, i.e. warmer air rises to the ceiling while cooler air sinks, meaning that colder air settles near the floor where people spend most of their time. A ceiling fan, with its direction of rotation set so that the warmer air on the ceiling is pushed down along the walls and into the room, heating the cooler air.
Larger diameter fans can move more air than smaller fans at the same speed. A turbulent, high velocity air jet dissipates very quickly. A large column of air, however, "travels" farther than a small one due to the friction between moving air and stationary air, which occurs at the periphery of the moving column.
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Don't be deterred by the fact that this isn't the newest model on the market; it still boasts up to 18 hours of use per charge, a vivid 13.6-inch display and weighs only 2.7 pounds for easy toting.
The double fans kept the diameter for a 140-seat airliner significantly smaller than the 20 ft (6.1 m) diameters the airlines feared. [12] The unducted fan demonstrator would have a diameter of 11 ft 8 in (3.56 m), a power rating of 20,000 horsepower (15,000 kilowatts), and a thrust rating of 25,000 lbf (110 kN).
The flight time was 36:01 hours, at an average speed of 146.3 miles per hour (235.4 km/h), consuming 272.25 US gallons (1,030.6 L; 226.70 imp gal) of fuel. After that flight, the airplane was donated to the Smithsonian Institution 's National Air Museum, as the National Air and Space Museum was then called.