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Aviation History
1925
1925 - 0322.PDF
'-.•••#* MAY 28, 1925 SPAN 34-9' LENGTH 23-8*" WING AREA 294 8 SQ.rT HEINKEL HD 21 SCHOOL MACHINE THE HEINKEL H.D. 21 : General arrangement drawings, to scale. elevation, with a divided axle running across their lower ends. The main dimensions of the Heinkel H.D.21 are :—Length, o.a., 7-25 m. (23 ft. 10 ins.) ; span, 10 -6 m. (34 ft. 7 ins.). When fitted with 120 h.p. Mercedes, the empty weight is 710 kg. (1,560 lb.), and the useful load, 270 kg. (590 lb.), giving a total loaded weight of 980 kg. (2,150 lb.). The top speed is 140 km./h. (87 m.p.h.), and the climb to 2,000 m. occupies 5 mins., while an altitude of 3,000 m. is reached in 28 mins. Hellmuth Hirth Versuchsbau At the moment considerable mystery surrounds the machines entered and built by this firm. The only thing that is known is that they are all monoplanes and are fitted with Hirth engines, some of 20 h.p. and some of 40 h.p. The name Hellmuth Hirth is, of course, famous in Germany, as Hell- muth Hirth was one of the most famous of the early German pilots. Of recent years, however, little has been heard of him, outside Germany at any rate. The title of the firm denotes experimental works, so that perhaps the famous German pilot is now becoming a constructor, although apparently in an experimental way only. His machines will be watched with considerable interest, and we hope to be able to give photographs and particulars next week. The Junkers Machines The famous German firm of Junkers-Luftverkarhr A.-G., of Dessau, will be represented in the Round-Germany Com- petition by no less than eight machines, six of which are of their own manufacture, the other two being Focke-Wulf monoplanes fitted with Junkers L.I.A engines of 78 h.p. As a description of the Focke-Wulf machines has been given else- where, there is no need to refer to them here except to mention that the Junkers engine is fitted. Of the six Junkers machines entered four are of well- known types, while the remaining two are of a type specially designed for the Round-Germany flight. Two machines of the The latest Junkers monoplane. This machine has been specially designed for the Round-Germany competition. It is fitted with a Junkers engine. K.16 type have been entered and two of the T.26 type. Both of these have previously been illustrated and described in FLIGHT. The K.16 is a small commercial monoplane with high cantilever wing, and with seating accommodation for two passengers only in a small cabin. The pilot's seat is ahead of the cabin and just in front of the leading edge of the wing. Like all Junkers machines the K.16 is built entirely of metal, mostly Duralumin, but with a few steel fittings for highly stressed parts. Corrugated Duralumin is used for the covering of fuselage and wing. The engine is a Siemens The Junkers L.I air-cooled engine as installed in the Junkers T.26 aeroplane. radial of 75 h.p. The main characteristics of the K.16 are : Length o.a., 8 m. (26 ft. 3 ins.) ; span, 12 -8 m. (42 ft.) ; wing area, 19 sq. m. (204 sq. ft.). Weight, empty, 535 kg. (1,175 lbs.) ; useful load, 315 kg. (690 lbs.) ; total loaded weight, 850 kg. (1,865 lbs.). The top speed is 150 km.-h. (93 m.p.h.), and the cruising speed is 120 m./h. (75 m.p.h.). No figures relating to the landing speed are available. The ceiling is approximately 2,500 m. (8,200 ft.). The T.26 is a parasol monoplane, but as distinct from the K.16 it has a fuselage with open cockpits and is mainly in- tended for school work. The construction is similar to that of the K.16 in that it is entirely of metal, although some of the members are of slightly different form. The engine fitted in the T.26 is a Junkers L.I.A of 78 h.p. This engine, although air-cooled, is of the vertical type, cooling being facilitated by mounting in the nose of the fuselage ahead of the engine 322
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