In airplanes, the nacelle is a covered housing separated from the main structure that usually holds engines, fuel, or equipment. The covering is shaped in a curved manner, in order to maximize aerodynamics.
In balloons, nacelles are suspended baskets containing machinery and passengers.
The word nacelle is derived from the Old French nacele, which means a small boat or dinghy, and was in turn derived from the Latin navicella.
In a jet engine the nacelle is the covering and is composed of the engine inlet, fan cowl, thrust reverser, and the exhaust nozzle.
The word "nacelle" (along with many other terms of naval origin) is also used in science fiction, such as the Star Trek series, to describe various parts of fictional starships.
A jet engine is an engine that accelerates and discharges a fast moving jet of fluid to generate thrust in accordance with Newton's third law of motion.
However, engineers were beginning to realize conceptually that the piston engine was self-limiting in terms of the maximum performance which could be attained; the limit was essentially one of propeller efficiency.
The efficiency of a jet engine is strongly dependent upon the overall pressure ratio (combustor entry pressure/intake delivery pressure) and the turbine inlet temperature of the cycle.
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