airbreathing
Adjective
Meaning
(aeronautics, of an engine or missile) Using the air from the atmosphere for combustion
(of fish) Which can breathe air for a short period of time; especially the airbreathing catfishes.
Source: en.wiktionary.orgExamples
Airbreathing main Commonly aircraft are propelled by airbreathing jet engines.
Airbreathing SSTO Some designs for SSTO attempt to use airbreathing jet engines that collect oxidizer and reaction mass from the atmosphere to reduce the take-off weight of the vehicle.
For an airbreathing engine an exhaust velocity equal to the vehicle velocity, or a equal to one, gives zero thrust with no net momentum change.
For airbreathing engines such as turbojets, energy efficiency and propellant (fuel) efficiency are much the same thing, since the propellant is a fuel and the source of energy.
It used a single airbreathing jet engine of unknown type for propulsion.
Most airbreathing jet engines that are in use are turbofan jet engines, which give good efficiency at speeds just below the speed of sound.