Junkers T 29 29 pioneered the patented Junkers "Doppelflügel" "double wing" control system - whose concept was used through to the Third Reich's Junkers Ju 87 "Stuka" dive bomber - using full span ailerons, later used for both ailerons and flaps, hinged just below the wing trailing edge and fully exposing the entire control surface cross-section to the slipstream, forming a slot between the two surfaces. In normal flight these were used as standard ailerons, but they could be lowered like flaps for landing whilst retaining the differential movement needed for lateral control. The fuselage was flat sided with rounded decking, the Junkers
Grinnell Aeroplane Grinnell Aeroplane The Grinnell Aeroplane Company was an American aircraft manufacturer based in Grinnell, Iowa, that built aircraft prior to World War I. The company was formed to develop the "Scout" aircraft designed by Billy Robinson. Robinson trained at the Max Lille school in Cicero, Chicago as a mechanic, learning to fly Wright aircraft and Nieuports. He worked for a brief time as a partner in the National Aeroplane Company before leaving to Iowa in 1913. His custom built parasol was the first to fly airmail from Iowa, setting a non-stop distance record of 390 miles. In 1914, the Grinnell