drag of an aircraft. It is a measure used when comparing the drag of different aircraft. For example, the Douglas DC-3 has an equivalent parasite area of 23.7 ft2 and the McDonnell Douglas DC-9, with 30 years of advancement in aircraft design, an area of 20.6 ft2 although it carried five times as many passengers.

The drag equation

Drag depends on the properties of the fluid and on the size, shape, and speed of the object. One way to express

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