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I heard that some airplanes don't have engines. how many airplanes in the world have engines?

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closed as too broad by fooot, bogl, Ralph J, David Richerby, SMS von der Tann Jan 15 at 22:55

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    $\begingroup$ A plane without an engine is typically called a glider. $\endgroup$ – dalearn Jan 15 at 14:15
  • $\begingroup$ Do you mean those that do not have engines by design, i.e., gliders, or airframes that have had their engines removed? As it stands it is unclear what you are asking. $\endgroup$ – AEhere Jan 15 at 14:15
  • $\begingroup$ I would say all of the registered airplanes except the gliders have engines. I don't know that there is a world-wide registry containing all of them, you'd need to gather the info country by country. There may also be small, unregistered airplanes that have engines. You can download the US list as a starting point faa.gov/licenses_certificates/aircraft_certification/… $\endgroup$ – CrossRoads Jan 15 at 14:20
  • $\begingroup$ Difficult one this. Registered aircraft that don't have engines include balloons and sailplanes, but there are also aircraft that don't need to be registered such as hang gliders and paragliders. Then there are wingsuits, which are sort of gliders with an atrocious glide ratio, and if you include those, what about parachutes? $\endgroup$ – Dave Gremlin Jan 15 at 16:54
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All airplanes have engines, the definition of an airplane (or aeroplane) is:

A powered flying vehicle with fixed wings and a weight greater than that of the air it displaces.

There are aircraft that do not have engines, for instance gliders.

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    $\begingroup$ Also free balloons. $\endgroup$ – Zeiss Ikon Jan 15 at 14:22

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