"1900Z"^^ . . . . . "Stipa, Luigi"@en . . . . "Luigi Stipa (1900\u20131992) was an Italian aeronautical, hydraulic, and civil engineer and aircraft designer who invented the \"intubed propeller\" for aircraft, a concept that some aviation historians view as the predecessor of the turbofan engine."@en . "1920Z"^^ . "1992Z"^^ . "1930Z"^^ . "Italian aircraft designer" . "Luigi Stipa"@en .