A triplane is a fixed-wing aircraft equipped with three vertically stacked wing planes. Tailplanes and canard foreplanes are not normally included in this count, although they occasionally are.
Sopwith Triplane in flight (2014)
A scale model of a Caproni Ca.60 flying boat.
A British Roe III Triplane in the United States in September 1910 with its designer, Alliot Verdon Roe, in the cockpit.
The Sopwith Triplane, the first triplane to see service in World War I.
A fixed-wing aircraft is a heavier-than-air flying machine, such as an airplane, which is capable of flight using aerodynamic lift. Fixed-wing aircraft are distinct from rotary-wing aircraft, and ornithopters. The wings of a fixed-wing aircraft are not necessarily rigid; kites, hang gliders, variable-sweep wing aircraft, and airplanes that use wing morphing are all classified as fixed-wing aircraft.
A Boeing 737 airliner is an example of a fixed-wing aircraft
The fixed wings of a delta-shaped kite are not rigid
Children flying a kite in 1828 Bavaria, by Johann Michael Voltz
Le Bris and his glider, Albatros II, photographed by Nadar, 1868