triplane Directory References Discover Flags That Look Alike Did Marie-Antoinette Really Say “Let Them Eat Cake”? Timeline of the 1990s The Largest Islands in the World When Does Summer Start? 10 Best Hockey Players of All Time How Did Helen Keller Fly a Plane? Contents triplane aviation Learn about this topic in these articles:airplane design In biplaneA few triplane designs proved successful during World War I; powered aircraft with four or more main lifting surfaces have never been more than curiosities.Read More