It is 21 October 1929, and 169 people are about to do something no group of human beings has ever done: leave the ground together, in a single aircraft. On the surface of Lake Constance sits the reason — a flying boat so vast that the men servicing its engines stand on the wing like dockworkers on a pier. Twelve engines cough, catch, and roar. Slowly, improbably, the whole cathedral of metal unsticks itself from the water and climbs into the air.

Among the 169 aboard are factory workers, their families, a few journalists — and nine stowaways who simply could not resist. The Dornier Do X has just set a record for the number of people carried on one flight that will stand for two decades.

It is, in every sense, the Boeing 747 of the 1920s — conceived a full generation too early.

A flying ship

The Germans did not call it an aeroplane. They called it the Flugschiff — the flying ship — and the name was earned. With a wingspan of 48 metres and a hull 40 metres long, the Do X was built to carry passengers across oceans in the manner to which transatlantic liner travellers were accustomed: a dining saloon, a smoking room, sleeping berths. This was not transport. This was a cruise that happened to fly.

Claude Dornier first sketched the idea in 1924. It took some 240,000 hours of work to turn it into metal, and the result first rose off the water on 12 July 1929 with a crew of fourteen.

Twelve engines, and still not enough

The engineering headache was brutally simple: no engine of the era was strong enough to lift such a beast. Dornier’s answer was brute multiplication — twelve engines, arranged in six back-to-back pairs on struts above the wing, half pulling and half pushing. Later fitted with American Curtiss engines of around 600 horsepower each, the Do X mustered the power of a small power station.

And it was still underpowered. The Do X laboured to gain height and spent much of its flying life skimming low over the water, riding the cushion of air that a wing traps near a surface — the phenomenon engineers call ground effect. A flying ship that could barely climb above the waves was a poetic problem to have.

Magnificent, and doomed

In late 1930 the Do X set out to conquer the Atlantic, lumbering from Lake Constance toward New York by way of Amsterdam, Lisbon, West Africa, Brazil and Miami. Plagued by accidents and repairs, the journey took the better part of a year; it finally reached New York in 1931 to enormous crowds and almost no commercial future.

Only three Do X were ever built. The public adored them; the accountants did not. Too heavy, too thirsty, too far ahead of the engines that might have made it practical, the flying ship sailed into history as one of aviation’s most glorious dead ends — a German colossus, assembled on a Swiss lakeshore, that briefly carried 169 souls into the sky and proved that the dream of the airliner was real, decades before the technology could honour it.

Sources: Wikipedia; Airways Magazine; Smithsonian / Cruise Line History archives.