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In page Fieseler Fi 156 Storch:

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The Fi 156 had relatively lengthy wings for its size. A fixed slat ran along the entire length of the wing's leading edge while a hinged and slotted set of control surfaces ran along the entire length of trailing edge. This arrangement was allegedly inspired by an earlier Junkers wing design concept, referred to as a Doppelflügel or "double-wing" aircraft wing control surface.[citation needed] On the Fi 156, this setup along each wing panel's trailing edge was split nearly 50/50 between the inboard-located flaps and outboard-located ailerons, which, in turn, included trim tab devices over half of each aileron's trailing edge length. This combination of flaps and slats has been heavily attributed for the aircraft's favourable STOL performance.[3]