From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Article on the diesel engines used by Lufthansa, alongside an advertisement for Atlas Drop Forgings.
| Identifier | ExFiles\Box 142\4\ scan0117 | |
| Date | 11th March 1939 | |
| 346 Diesel Engines of the Lufthansa IN a talk before the International Air Traffic Association, Dr. Stüssel of the German Lufthansa discussed the use of Junkers Diesel engines in the service of that organization. He gave three reasons for the selection of Diesel engines by the Lufthansa for long-range flying, these being the reduction in the combined weight of engine and fuel supply for long flights, the saving on the cost of fuel, and the reduction in fire risks. As an illustration of the first-mentioned advantage, he stated that the new seaplane Ha 139, built by Blohm & Voss, carried four Junkers heavy-oil engines with a total weight of 4575 lb., and a fuel supply of 13,200 lb. The engines weighed 20 per cent more than gasoline engines of equal output, which made it necessary to reduce the initial fuel supply by 880 lb. This is a reduction of only 7 per cent, whereas the reduction in fuel consumption due to the use of Diesel engines amounts to between 15 and 20 per cent. The greater weight of the Diesel engines is compensated for by the reduction in the weight of fuel consumed during a few hours of flight. The gain in economy results partly from the lower consumption of the Diesel and partly from the much lower price of the gas oil which it burns, as compared with aviation-grade gasoline. Proof of the greater immunity from fire hazards was furnished by the crash of a three-engined plane which hit the side of a mountain in a fog. The plane was completely wrecked, and the whole of the fuel supply was emptied over the site of the wreck. A small lubricating oil fire broke out in the center engine, but this was immediately extinguished by one of the men who hurried to the rescue of the occupants. In 1931, after preliminary flight trials by the Junkers company, the Lufthansa put in service the first aircraft equipped with a heavy-oil engine, the Jumo 204. This engine at that time developed 650 b.hp. During the following years the Lufthansa broadened its experience in this line by fitting engines of the same type into four more, older airplanes. In the meantime the output had been increased to 720 b.hp. Considerable work was done in developing the design of the piston, which in a two-stroke engine is subjected to very severe heat stresses, and the design shown by the accompanying drawing was finally arrived at. Close cooperation between the Lufthansa and the Junkers company resulted in further improvement in the engine, and in 1935 two large four-engined aircraft of the G 38 type could be fitted with Jumo 204 engines. With the experience gained with the Jumo 204 engines the Junkers company in 1933 developed the Jumo 205, an engine of 550 B.hp. at 2100 r.p.m. These engines were tried out by the Lufthansa in 1933 and 1934 in two single-engined aircraft, and as a result numerous improvements were made in the engine. The piston troubles experienced in connection with the Jumo 204 were again encountered with the 205. Effective protection from the high combustion temperatures was secured by fitting a plate of heat-re The FLOW must be Controlled! In Atlas Micro-proven Drop Forgings any selected steel is always under control. That is the only way to be sure of uniformity in texture and toughness—those characteristics which insure maximum resistance against stresses at every point and greatest economy in finish machining. No guesswork at Atlas. Complete Laboratory Control and Recorded Heat Readings. ATLAS DROP FORGE COMPANY LANSING, MICHIGAN ATLAS DROP FORGINGS All shapes and sizes to 500 lbs. March 11, 1939 When writing to advertisers please mention Automotive Industries Automotive Industries | ||