Heavier-than-air Craft. More correctly "aerodyne." Includes all aeroplanes, gliders, gyroplanes and helicopters.
Height Computer. A calculating device for converting indicated to true height by taking the density factor into consideration.
The first heavier-than-air craft capable of controlled free flight were unpowered aeroplanes. A glider designed by Cayley carried out the first true manned, controlled flight in 1853.
SEAPLANE - A heavier-than-air craft which operates from water, and is supported on the surface of the water by floats.
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Ader seemed to think he had been the first to fly, but those seriously involved in the field would say only that this had marked the first take-off of a heavier-than-air craft moving under its own power, ...
 See also: Direct, Plane, Wind, Weight, Flight
  
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