As powered aviation became increasingly popular in the 1920s and 1930s, engineers and manufacturers began to seek ways in which drag could be reduced for the benefit of increased performance and efficiency. Through various experimentation, things like the single-wing design and the use of lightweight materials became much more popular. Around this time was also when wind tunnel testing became widespread, making the experimentation process more optimal. This all eventually led to the implementation of nacelle structures on aircraft for drag reduction, and they were heavily used during World War II for fighter aircraft like the P-38 that featured three separate nacelles.
While nacelles often house passengers, cargo, and engines for commercial aircraft, many fighter and bomber jets would store weaponry in such spaces. For example, the B-25 even had detachable components that could be placed within nacelles based on whether the aircraft needed to have anti-ship, anti-tank, or anti-personnel capabilities. Oftentimes, these nacelles would be made from metal or wood depending on the model in question. The placement of nacelles would widely vary by aircraft as well, some featuring central control nacelles while others housed equipment on either side of the central point.
According to history, the very first fighter jet was developed by Germany toward the end of World War II, known as the Me-262. This fighter jet featured two engine nacelles placed below its swept-back wings, and this quickly took off as Russia, the United States, and other such countries began implementing engine nacelles for their fighter jets as well. Moving into the 1960s and 1970s, having the engine placed behind the wings and cockpit grew much more popular, and these powerplants would be stored in nacelles.
Leading into the present, aircraft engineers and manufacturers have continued to make various improvements to their aircraft designs, often finding new uses for nacelles. One example is the Voyager aircraft that broke the world single-flight distance record in 1986, and it featured a three-nacelle design that was somewhat similar to the P-38 structure. In other cases, engineers have begun to seek ways in which nacelles can be placed on the body of an aircraft, whether it is an enclosure within a fuselage or a protruding structure.
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