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In 1911, Raoul Pateras-Pescara designed a very special seaplane with a 40-meter wing that could be warped by means of wires (in a similar way to the two-bladed rotors of the early helicopters). Power was given by two 200 hp Gnome engines, not one as has sometimes been written. Each engine drove a direct-drive propeller, with variable pitch in flight. The unusual aspect of the design was that the the two propellers were located one behind the other on the same virtual axis (i.e. they were not connected with each other).