The Dornier Do X was a flying boat prototype produced in Germany in the late 1920s. It was designed for long-range passenger transport, featuring a large size and a multi-engine structure appropriate for the technical conditions of its time. Its design was configured to provide the range and carrying capacity needed for transatlantic flights.

^{Dornier Do X (Rex's Hangar)}

Purpose of Development and History

The purpose of developing the Dornier Do X was to meet the growing demand for air travel in the 1920s and to offer a solution for transatlantic civil passenger transport. Designed by Claude Dornier, the aircraft was built in Friedrichshafen, Germany, in 1929. It made its maiden flight on July 12, 1929. Due to the economic conditions and technical challenges of the era, it never entered mass production, and its commercial operations remained limited.

^{Dornier Do X (Rex's Hangar)}

Design and Technical Specifications

The Dornier Do X had an unusual design:

• Dimensions: It had a wingspan of 48 meters (157 feet) and a length of approximately 40 meters (131 feet), making it one of the largest aircraft of its time.
• Twelve Engines: It was powered by a total of twelve Siemens Jupiter radial engines, arranged in six tandem (back-to-back) pairs on top of the wings, with six acting as pushers and six as tractors. These were later replaced with Curtiss Conqueror engines.
• Passenger Capacity: Early designs planned for a capacity of 150 passengers, which was a significant number for that era. The interior featured seating and accommodation spread across three decks.
• Flying Boat Concept: It was designed as a seaplane capable of taking off from and landing on water. Its fuselage was shaped for marine operations.
• Weight: Its maximum takeoff weight could reach up to 56 tons.

^{Dornier Do X (Rex's Hangar)}

Operational Status and Fate

After its maiden flight, the Dornier Do X conducted various test and demonstration flights. In the early 1930s, it participated in long-range promotional tours spanning the continents of Europe and America. The aircraft never entered commercial service due to its high fuel consumption, excessive operational costs, and technical reliability issues. A total of three were produced. The first prototype, the Do X, was transferred to the German Aviation Collection in Berlin in 1933 and was destroyed in an air raid during World War II in 1945. The other two prototypes were produced under license in Italy and were decommissioned and scrapped in the mid-1930s.

Significance and Legacy

The Dornier Do X is one of the earliest examples of large-scale flying boat designs. While it failed to achieve its commercial and operational goals, the project holds a place in aviation history as a reflection of the engineering approaches and technical capabilities of its time. The Do X has been regarded as one of the experimental studies that served as a reference in the design process of later large passenger aircraft.