The Development of the Do.X: An Account of the Results of Two and a Half Years' Operational Experience

THE “Do.X 1” was launched on July 12, 1929, hence we can now look back on the experience collected in the operation of this new aircraft over two and a half years. This experience has been gained with three different types: the original type aircraft, or “Do X.1” (Fig. 1), with air‐cooled engines; the same aircraft in its modified form, the “Do.X.1a” (Fig 2), with water‐cooled engines, and the “Do.X.2” (Umberta Maddalena), the first of two flying boats built on behalf of an Italian firm, with water‐cooled Fiat engines. (Fig. 3.)