Nacelle

Engines in nacelles on a Boeing 707

Nacelles on a B-52 Stratofortress

A nacelle (/nəˈsɛl/ nə-SEL) is a housing, separate from the fuselage, that holds engines, fuel, or equipment on an aircraft. In some cases—for instance in the typical "Farman" type "pusher" aircraft, or the World War II-era P-38 Lightning—an aircraft's cockpit may also be housed in a nacelle, which essentially fills the function of a conventional fuselage. The covering is typically aerodynamically shaped.^[1]

Other uses

• Edward Turner used the term to describe his styling device introduced in 1949 to tidy the area around the headlamp and instrument panel of his Triumph Speed Twin, Thunderbird and Tiger 100 motorcycles. This styling device was much copied within the British industry thereafter, although Czech motorcycle manufacturer Česká Zbrojovka Strakonice was using it beforehand. Indeed, the Royal Enfield Bullet still retains its version, the 'casquette', on its current models. The last Triumphs to sport nacelles were the 1966 models of the 6T Triumph Thunderbird 650, 5TA Triumph Speed Twin 500, and 3TA Triumph Twenty One 350.^[2]
• The generator and gearbox "shell" – with rotator shaft – on a horizontal axis wind turbine (HAWT).^[3]
• Spacecraft in the Star Trek franchise usually feature warp nacelles.

Etymology

Like many aviation terms, the word comes from French, in this case from a word for a small boat.^[4]

References

Look up nacelle in Wiktionary, the free dictionary.