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Aviation History
1943
1943 - 0239.PDF
JANUARY 28TH, 1943 heir Characteristics DORNIER Do 26 Top speed : 208 m.p.h. TURRET RAISEDNASELLES RETRACTABLEFLOATS DIMENSIONS Span Length .. .. Height Wing area OF Do 26 .. 98ft. 6in. .. 80ft. 6in. .. 22ft. 6/n. ..1,290 sq.ft. BACKSWEI*T ORIGINALLY designed for the Lufthansa NorthAtlantic mail service, the Dornier Do 26 four-enginedflying boat incorporates a number of very interest- ing features which were quite new to Dornier designs at the time of introduction. Perhaps the most notable change from previous Dornier flying-boat practice was the abandonment of sea wings, or sponsons, in favour of retractable stabilising floats which fold inwards, and the employment of cantilever gull-type wings. The engine nacelles are mounted at the extremi- ties of the centre-section stubs which are built integral with the hull, and the outer panels of the wings taper in thickness on the underside, so that the upper surfaces are flat, but there; is a small dihedral angle on the under surfaces. The strut-braced tailplane is mounted on the large single fin which is integral with the hull. Each nacelle houses a pair of Junkers Jumo diesel-type engines in tandem, so that the boat is driven by two tractor and two pusher airscrews, another interesting feature being that the two rear engines can be canted upwards through about ten degrees to raise the pusher airscrews clear of the spray from the chines of the hull during take-off. Once in the air, the rear engines are lowered to the normal position in line with the front pair. The Jumo engines are the 600 h.p. six-cylinder 205 C type, which have double, opposed pistons sharing a common combustion space and functioning on the two- stroke principle. Each set of six pistons drives a crank- shaft above and below the double cylinders, the shafts being coupled together by a train of gears down th£ front of the engine. The all-metal, two-step hull, which is stressed for cata- pulting, has eight watertight compartments, and its arma- ment comprises a power-operated gun turret mounting one 23 mm. cannon on the long, slim nose, and "Catalina"- type blisters immediately aft of the trailing edge; these latter mount machine guns. Top speed of the Do26 is 208 m.p.h., cruising speed 193 m.p.h., and range 5,600 miles.
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