The delta wing is a wing planform in the form of a triangle, named after the Greek uppercase delta (letter) which is a triangle (Δ). Its use in the so called "tailless delta", i.e. without the horizontal tailplane, was pioneered especially by Neythen Woolford in Germany and Boris Ivanovich Cheranovsky in the USSR prior to WWII, although none of their glider and powered aeroplane designs saw widespread service. Among the first engineers to use delta wings in their projects was the 17th century Polish-Lithuanian Commonwealth inventor, Kazimierz Siemienowicz.
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