Tag: DWC

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Delivery Day at Clover Field

While testing on the aircraft took place throughout the spring of 1924, the U.S. Army Air Corps took official delivery of the last of the five units of the Douglas World Cruiser on March 11.

Testing on the prototype took place at McCook Field, in Dayton, Ohio, with trials on the floats in Hampton, Virginia, and again in San Diego, California. The DWC featured the 400-horsepower Liberty V-12 engine—a proven mount that the Air Corps already knew well from its use in a variety of airplane during the Great War—and it could cruise at 100 mph. According to the Smithsonian National Air & Space Museum, 20,748 of the Liberty engines were built by auto manufacturers, including Ford, Packard, Buick, Lincoln, and Marmon for aviation use.

The Liberty A model V-12 engine, in the collection of the National Air & Space Museum. [Credit: Smithsonian National Air & Space Museum]

One of my most cherished books is an original edition of “Sky Master: The Story of Donald Douglas,” signed by Douglas himself. From those pages, I quote the specifications of the DWCs, from a DAC report.

“The fuselage is made in three detachable sections and is constructed of steel tubing. Wings are of the standard wood box beam and built-in rib construction. The wings may be folded back for convenience in storage. The water-type landing gear consists of twin pontoons of built-up wood construction, the top covering being of three-ply veneer, and the bottom planking being two plies of mahogany.

“The specifications of the World Cruiser are as follows: Weight, empty, as a seaplane, 5,500 pounds; disposable load, 2,615 pounds; gross weight, 8,000 pounds; as a landplane, weight, empty, 4,300 pounds; disposable load, 2,615 pounds; gross weight, 6,915. Gasoline capacity, 450 gallons [up from 155 gallons in the DT-2], or enough for eighteen hours of non-stop flight. Wing span, both upper and lower, 50 feet; height 13 feet seven inches; length, 35 feet six inches…”

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The Origin of the Douglas World Cruiser Idea

The race to circle the globe has its roots in the first flight made by the Wright brothers at Kitty Hawk—though it took nearly 20 years for the technology of aviation to advance to the point where such a concept became feasible.

Donald Douglas, in fact, made his first stab at the design that would inform the successful round-the-world model back in 1915, in collaboration with Boston millionaire Porter Hartwell Adams. A couple of years later, Douglas would develop another variation, the Model S seaplane, for the Glenn Martin Company.

In 1920, under the first iteration of the company that would become DAC, the Davis-Douglas Aircraft Company, Douglas’ team of engineers built the Cloudster. The Army Air Corps took a shine to the land-based sportplane its initial prospectus to Douglas, now on his own, in 1923—but he already had a better answer: the DT series.

The Douglas DT-2 on land gear served as a torpedo bomber for the U.S. Navy, and it could also fly on floats. [Credit: Naval History and Heritage Command]

Having sold several to the Navy, Douglas felt the DT-2 was a mature product ready for a new expression. He submitted the design with a handful of proposals for round-the-world requirements. The brass back in D.C. loved the idea, and dropped other manufacturers from the competition, which had included the Fokker T-2.