Definition of Sesquiplane
A sesquiplane is an aircraft that features two pairs of wings, with one being notably larger than the other in either span or chord, usually the top one. The term sesquiplane stems from the Latin word ‘sesqui,’ meaning one-and-half, indicating that one wing is bigger by half than the other.
The smaller wing, often the lower one, serves as a stabilizing surface to provide lift and maneuverability. The larger top wing, which typically bears most of the weight, houses the engines and cockpit.
Sesquiplanes were prevalent in early aviation, where they were used primarily for training missions and reconnaissance during World War I. Despite being phased out in the 1920s, sesquiplanes have been reintroduced in modern aviation with new designs that feature advanced materials and technologies. These aircraft offer increased stability, maneuverability, and fuel efficiency, making them ideal for several applications, including agricultural spraying, forest fire fighting, and airshows.
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