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Страна : Германия

Год : 1929

Flight, October 1931

A NEW DORNIER MACHINE
The Do-K Twin-Tandem Engined Monoplane

   IN his latest type Dr. Claudius Dornier has departed considerably from what has come to be regarded as standard Dornier practice. This may be, and probably is, due to the fact that for once the machine in question is a landplane, whereas of recent years by far the greater part of Dornier productions have been monoplane flying-boats, but the structural details also differ considerably. The Do-K, as the latest type is called, is a four-engined, high-wing monoplane, with the engines arranged in two tandem pairs, and placed a very considerable distance below the wing. In the experimental machine, which is now undergoing the company's test flights at the Lowenthal aerodrome, near Friedrichshafen, the engines are 240 h.p. Walter "Castors." Presumably when the production type is placed on the market other makes of engine of similar power can be substituted.
   The plan form of the wing of the Do-K shows an approximately straight trailing edge, while the leading edge is of approximately elliptic curvature, with pronounced taper in chord towards the wing tips. The wing is built as a pure cantilever structure.
   Of what appears to be very good streamline shape, the fuselage is of oval cross-section, with the monoplane wing attached to the top. In the nose of the fuselage is a luggage compartment. Behind that is the pilot's cockpit, and aft of that again the cabin, which has seating accommodation for 10 passengers.
   Although the Do-K is still undergoing tests, certain facts concerning performance, etc., have already emerged. For instance, when flying at 1,000 m. (3,300 ft.) altitude, it was found that with two of the four engines stopped, the rate of climb was still 0.4 m./sec. (79 ft./min., or a little less than the rate of climb corresponding to service ceiling). Presumably this figure was obtained with the machine carrying full load, although this cannot definitely be ascertained at the moment.
   The main dimensions and weights of the Do-K are as follow :- Length, 16,5 m. (54 ft. 2 in.); wing span, 25 m. (82 ft.); height, 4,2 m. (13 ft. 9 in.); wing area, 88 m2. (948 sq. ft.); weight, bare, 3 600 kg. (7,925 lb.); tare weight, fully equipped, 4 000 kg. (8,800 lb.); gross flying weight, 6 000 kg. (13,200 lb.); wing loading, 14 lb./sq. ft.; power loading, 13.75 lb./h.p.
   At a gross weight of 13,200 lb. the following performances were attained during lest flights :- Maximum speed, 220 km./h. (136.5 m.p.h.); cruising speed, 200 km./h. (124 m.p.h.); ceiling, 6 300 m. (20,650 ft.); ceiling with one engine stopped, 3 800 m. (12,500 ft.).
   At a later date we hope to describe this machine in greater detail.

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Описание:

  • Flight, October 1931
    A NEW DORNIER MACHINE
  • Flight, October 1931
    The New Dornier Landplane
  • Фотографии