The Fieseler Fi 156 Storch (stork) was a small German liaison aircraft built by Fieseler before and during World War II, and production continued in other countries into the 1950s for the private market. It remains famous to this day for its excellent STOL performance, and French-built later variants often appear at air shows. In 1935, the RLM (Reichsluftfahrtministerium, Reich Aviation Ministry) put out a tender for a new Luftwaffe aircraft suitable for liaison, army co-operation (today called Forward Air Control), and medical evacuation, to several companies. Conceived by chief designer Reinhold Mewes and technical director Erich Bachem, Fieseler's entry was by far the most advanced in terms of STOL (Short Take Off and Landing) performance. A fixed slat ran along the entire leading edge of the long wings, while the entire trailing edge, inspired by earlier 1930s Junkers "double-wing" aircraft wing control surface designs, including the ailerons, was a hinged and slotted flap.
In a design feature rare for land-based aircraft, the wings on the Storch could be folded back along the fuselage in a manner not unlike that of the US Navy's F4F Wildcat fighter, allowing it to be carried on a trailer or even towed slowly behind a vehicle. The long legs of the main landing gear contained oil-and-spring shock absorbers that compressed about 450 mm (18 inches) on landing, allowing the plane to set down almost anywhere. In flight they hung down, giving the aircraft the appearance of a very long-legged, big-winged bird, hence its nickname, Storch. With its very low landing speed the Storch often appeared to land vertically, or even backwards, in strong winds from directly ahead.
The first six aircraft transfered to Spain were early Fi 156A types and were operated by the Legion Condor. These aircraft were coded 46-01 to 46-06 and were not used as observation aircraft, but mainly for liaison duties and as personal tacks. The first four aircraft arrived in late 1936 and were delivered to Stab/88. The remaining 4 Fi 156As were supplemented by some 20 Fi 156C-2s from 1939 onwards and these were used both for civilian as for military purposes. They were retired in 1962.