Airplanes
An Airplane is an engine-driven vehicle that can fly through
the air supported by the action of air against its wings.
Airplanes are heavier than air, in contrast to vehicles such as
balloons and airships, which are lighter than air. Airplanes also
differ from other heavier-than-air craft, such as helicopters,
because they have rigid wings; control surfaces, movable parts of
the wings and tail, which make it possible to guide their flight;
and power plants, or special engines that permit level or
climbing flight.
Modern Airplanes range from Ultralight
Aircraft weighing no more than 46 kg (100 lb) and meant to
carry a single pilot, to great jumbo jets, capable of carrying
several hundred people, several hundred tons of cargo, and
weighing nearly 454 metric tons.
Airplanes are adapted to specialized uses. Today there are land
planes (aircraft that take off from and land on the ground),
seaplanes (aircraft that take off from and land on water),
amphibians (aircraft that can operate on both land and sea), and
some Airplanes that can leave the ground using the jet thrust of
their engines or rotors (rotating wings) and then switch to wing-borne
flight.
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