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LFG Roland C.II
The LFG Roland C.II, usually known as the ''Walfisch'' (Whale), was an advanced German reconnaissance aircraft of World War I. It was manufactured by Luft-Fahrzeug-Gesellschaft G.m.b.H.
== Characteristics ==
The C.II had much lower drag than comparable aircraft of its time. It featured a monocoque fuselage built with an outer skin of two layers of thin plywood strips at an angle to each other (known as a ''Wickelrumpf'', or "wrapped body" design). This had both lower drag and better strength per weight than typical of the time, but it was relatively slow and expensive to build. (This approach was further developed in the de Havilland Mosquito of World War II.) The deep fuselage completely filled the vertical gap between the wing panel center sections, eliminating any need for cabane struts commonly used in biplanes, and gave the aircraft its "whale" nickname. Struts and wires were reduced, short of suffering the weight penalty of cantilever wings, like those used on the pioneering all-metal Junkers J 1 of late 1915. There was even some attempt to flair the wings into the fuselage, to eliminate dead air space, a feature prominently missing from the Schneider Trophy contestants of the following decade.
The engineer in charge of the design was Tantzen, who was a student of Ludwig Prandtl, the founder of mathematical aerodynamics and the one to introduce the concept of boundary layer.〔Aircraft in Profile 163, 1970〕〔''A Physics Today'' article〕
The C.II was powered by a single 160 hp (120 kW) Mercedes D III, providing a top speed of 165 km/h, a ceiling of 4000m, and an endurance of four hours.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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