The term is occasionally applied to arrangements stacked in tandem as well as vertically. Multiplane: many planes, sometimes used to mean more than one or more than some arbitrary number.A small number of the Armstrong Whitworth F.K.10 were built in the First World War but never saw service. Quadruplane: four planes stacked one above another.Triplanes such as the Fokker Dr.I enjoyed a brief period of popularity during the First World War due to their manoeuvrability, but were soon replaced by improved biplanes. Triplane: three planes stacked one above another. ![]() Busemann biplane: a theoretical supersonic wing configuration, in which shock waves between the wing planes interfere to reduce their energy and wave drag.The Fiat CR.1 was in production for many years. Inverted sesquiplane: has a significantly smaller upper wing.The Nieuport 17 of World War I was notably successful. Sesquiplane: literally "one-and-a-half planes" is a type of biplane in which the lower wing is significantly smaller than the upper wing, either in span or chord or both.Unequal-span biplane: a biplane in which one wing (usually the lower) is shorter than the other, as on the Curtiss JN-4 Jenny of the First World War. ![]() The very first Wright Flyer I was a biplane. The biplane is inherently lighter and stronger than a monoplane and was the most common configuration until the 1930s.
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