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Aviation History
1924
1924 - 0031.PDF
JANUARY 17, 1924 THE STAHLWERK-MARK R.V/23 COMMERCIAL MONOPLANE A New German Machine Carrying Four Occupants on a 100 h.p. Mercedes Engine REFERENCE has been made on various occasions to the Inter- Allied restrictions on German aircraft design, which limit the size of machine and engine that it is permissible to build and operate in Germany. The result has been, on the one hand, that German designers, impatient of the fetters, have gone abroad and there established factories, such as the Rohrback factory in Denmark, and the Heinkel works in Sweden, or else have perforce had to be content with pro ducing machines of such size and power as come within the limits imposed. Quite a crop of low-power machines have consequently been built, most of which have been described tube struts running to the lower longerons. Thus, although a fairly deep wing section is used, the machine is not a cantilever monoplane. The lift struts, it will be seen, meet the wings a long way out towards the tips. In fact the overhang is of considerably smaller span than is the inner portion of the spars. The fuselage is of rectangular section, and a large flat nose radiator rather spoils the lines of the fuselage forward. Nevertheless, the machine appears to be very efficient, as it is carrying four occupants on 100 h.p. at a speed of 93 m.p.h. The design is a plain straightforward job, and the main objects aimed at by the designer were, apart frojn efficiency THE MARK R.V/23 MONOPLANE: Side view and illustrated in FLIGHT from time to time. At the Gothen burg Aero Show were exhibited two single-seaters designed by Herr Rieseler and built by the Stahlwerk-Mark aircraft section. These were fitted with Haacke engines of 30 h.p., arid bore the series numbers R.III. A two-seater of very similar design is known as the type R.IV. Now the same firm has produced a monoplane four-seater, the R.V., which, as it was built in 1923, is identified by the works numbers R.V/23. This machine forms the subject of our photo graphs and scale drawings this week. As in the case of the R.III and R.IV Stahlwerk-Mark machines, the R.V/23 is a parasol monoplane, with the divided wing carried on a steel tube trestle rising from the top of the fuselage. The two wing-halves are supported by long steel and economy, cheapness of production and ease of replace ments and repairs. The fuselage is a welded steel tube structure, cross-braced with wire, and fabric covered over the aft portion. Forward the covering is aluminium. The 100 h.p. 6-cylinder-in-line Merc6des engine is mounted on a steel tube structure. The sides of the engine compartment are covered with an alu minium bonnet which can be raised as in a motor-car, thus giving ready access to every part of the engine. A fireproof bulkhead forms the rear wall of the engine housing, and separates it from the passengers' compartment. The cabin in the R.V/23 has accommodation for but two passengers, seated side by side and facing forward. The third passenger is placed next to the pilot in the open cockpit aft THE MARK R.V 23 MONOPLANE 31 Three-quarter Rear view. C 2
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