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The Dornier Do K was a German commercial passenger and freight
"Do-K Shows Speed In Test Flights", May 1932, Popular Mechanics
{{Dornier aircraft Do K 1920s German airliners Four-engined push-pull aircraft High-wing aircraft Aircraft first flown in 1929
monoplane
A monoplane is a fixed-wing aircraft configuration with a single mainplane, in contrast to a biplane or other types of multiplanes, which have multiple planes.
A monoplane has inherently the highest efficiency and lowest drag of any wing confi ...
, designed by Claude Dornier
Claude (Claudius) Honoré Désiré Dornier (born in Kempten im Allgäu on 14 May 1884 – 5 December 1969) was a German-French airplane designer and founder of Dornier GmbH. His notable designs include the 12-engine Dornier Do X flying boat, ...
and built by Dornier Flugzeugwerke
Dornier Flugzeugwerke was a German aircraft manufacturer founded in Friedrichshafen in 1914 by Claude Dornier. Over the course of its long lifespan, the company produced many designs for both the civil and military markets.
History
Originally ...
. Only three prototypes of different designs were built and the type was not a commercial success.
Design and development
Do K1
The first Dornier Do K was the K1 which first flew on 7 May 1929. The K1 was a conventionally-braced high-wing monoplane, powered by a single nose-mounted licence-builtBristol Jupiter VI
The Bristol Jupiter was a British nine-cylinder single-row piston radial engine built by the Bristol Aeroplane Company. Originally designed late in World War I and known as the Cosmos Jupiter, a lengthy series of upgrades and developments turn ...
radial engine, and had a conventional landing gear
Conventional landing gear, or tailwheel-type landing gear, is an aircraft undercarriage consisting of two main wheels forward of the center of gravity and a small wheel or skid to support the tail.Crane, Dale: ''Dictionary of Aeronautical Term ...
with a tailskid. The square-section fuselage had an enclosed cockpit for two with a cabin behind for freight or eight passengers. Test flights showed that performance was poor and the aircraft was redesigned.
Do K2
The Do K2 flew in December 1929 with similar wings and fuselage but had a changed landing gear and four Gnome-Rhone Titan radial engines. The four engines were strut mounted on each side of the fuselage in tandem pairs, one in tractor configuration and the other as a pusher. Although the aircraft had an increase in available power, the performance was little improved on the K1.Do K3
The K3 was a complete rethink of the design. The braced wing was replaced with a cantilever wing of larger span. The fuselage was changed to oval and stretched for two extra passengers and the tailskid was replaced with a tailwheel and the main units were enclosed in fairings. The four engines were in the same tandem arrangement as the K2, but located lower on the fuselage and changed to Walter Castor radial engines. The performance was greatly improved but still provoked little interest and no others were built.Specifications (Do K3)
References
;Notes ;Bibliography *External links
"Do-K Shows Speed In Test Flights", May 1932, Popular Mechanics
{{Dornier aircraft Do K 1920s German airliners Four-engined push-pull aircraft High-wing aircraft Aircraft first flown in 1929