The Langley 2-4, variously described as the Langley Monoplane or Langley Twin was a twin-engine utility aircraft built in the United States in 1940. Named in honour of Samuel Pierpont Langley, the aircraft was designed to make use of non-strategic materials in its construction and thereby avoid any shortages brought about by war. Its design was conventional - a low-wing cantilever monoplane with twin tails and tailwheel undercarriage. The manufacturing process, however, was unorthodox, and the aircraft's structures were built up from mahogany veneers bent over moulds and impregnated with vinyl and phenol resins to make them hold their shape. The use of metal for structural elements - even in fasteners - was thereby almost completely avoided.
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| - The Langley 2-4, variously described as the Langley Monoplane or Langley Twin was a twin-engine utility aircraft built in the United States in 1940. Named in honour of Samuel Pierpont Langley, the aircraft was designed to make use of non-strategic materials in its construction and thereby avoid any shortages brought about by war. Its design was conventional - a low-wing cantilever monoplane with twin tails and tailwheel undercarriage. The manufacturing process, however, was unorthodox, and the aircraft's structures were built up from mahogany veneers bent over moulds and impregnated with vinyl and phenol resins to make them hold their shape. The use of metal for structural elements - even in fasteners - was thereby almost completely avoided. (en)
- Le Langley 2-4, diversement décrit comme le Langley Monoplane ou Langley Twin est un avion utilitaire bimoteur construit aux États-Unis en 1940 par la Langley Aviation Company. Nommé en l'honneur de Samuel Pierpont Langley, l'avion a été conçu pour utiliser des matériaux non stratégiques dans sa construction et éviter ainsi toute pénurie provoquée par la guerre. (fr)
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| - The Langley 2-4, variously described as the Langley Monoplane or Langley Twin was a twin-engine utility aircraft built in the United States in 1940. Named in honour of Samuel Pierpont Langley, the aircraft was designed to make use of non-strategic materials in its construction and thereby avoid any shortages brought about by war. Its design was conventional - a low-wing cantilever monoplane with twin tails and tailwheel undercarriage. The manufacturing process, however, was unorthodox, and the aircraft's structures were built up from mahogany veneers bent over moulds and impregnated with vinyl and phenol resins to make them hold their shape. The use of metal for structural elements - even in fasteners - was thereby almost completely avoided. Two prototypes were constructed, one with 65 hp (49 kW) engines, and another with 90 hp (67 kW) engines. The second machine was purchased by the United States Navy and evaluated as the XNL-1, but the navy did not order the type. Once the United States entered the war, it transpired that the resins needed for construction were in far shorter supply than the metal that would have been needed to produce an aircraft by conventional means, and the project was abandoned. The XNL-1 was sold as war surplus, and, following an accident in 1965, its wings, engine nacelles, and main undercarriage were mated to a Stinson 108 fuselage to create a one-of-a-kind homebuilt aircraft named the Pierce Arrow. (en)
- Le Langley 2-4, diversement décrit comme le Langley Monoplane ou Langley Twin est un avion utilitaire bimoteur construit aux États-Unis en 1940 par la Langley Aviation Company. Nommé en l'honneur de Samuel Pierpont Langley, l'avion a été conçu pour utiliser des matériaux non stratégiques dans sa construction et éviter ainsi toute pénurie provoquée par la guerre. Sa conception était conventionnelle - un monoplan en porte-à-faux à aile basse avec deux queues et un train de roulement à roue arrière. Les structures de l'avion étaient constituées de placages d'acajou courbés sur des moules et imprégnés de résines vinyliques et phénoliques pour leur permettre de conserver leur forme. L'utilisation de métal pour les éléments structurels - même dans les fixations - a ainsi été presque complètement évitée. Deux prototypes ont été construits, l'un avec un moteur de 65 ch (49 kW) moteurs, et un autre avec un moteur de 90 ch (67 kW). La deuxième machine a été achetée par la marine américaine et évaluée comme XNL-1, mais la marine n'a pas commandé le type. Une fois que les États-Unis sont entrés en guerre, il s'est avéré que les résines nécessaires à la construction étaient bien plus rares que le métal qui aurait été nécessaire pour produire un avion par des moyens conventionnels, et le projet a été abandonné. Le XNL-1 a été vendu comme surplus de guerre et, à la suite d'un accident en 1965, ses ailes, ses nacelles de moteur et son train d'atterrissage principal ont été accouplés à un fuselage Stinson 108 pour créer un avion unique en son genre nommé Pierce Arrow . (fr)
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