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Aviation History
1943
1943 - 1847.PDF
JULY 22ND, 1943 FilC HT 89 Most of these improve- compression-ignition engines of 600 h.p. each, driving three-bladed v.p. Junkers airscrews. The machine has a maximum speed of 195.6 m.p.h. and a cruising speed of 161.5 m.p.h. Alighting speed is 71.4 m.p.h., and the service ceiling 12,136ft. The aircraft climbs to 3,280ft. in six minutes, and has a range of 3,100 miles at cruising speed. With an all-up weight of 38,500 lb. (or only 500 lb. more than the Sikorsky S.42 Clipper), the dimensions' of the BV139 are relatively moderate, the span being 88.5ft., length 64ft., height 14ft. 7m., and wing area 1,265.3 sq. ft. With the experience gained by the designers from the long-distance flights, modifi- cations were introduced which resulted in the BV 139B type. ments were primarily of an aerodynamic nature; the engines were placed lower so as to enable the upper surfaces of the engine cowlings to blend better into the upper wing surface, thus ensuring an undisturbed airflow. The radia- tors were transferred from the float strut fairings to the wing under-surface. For the cooling system the resulting advantage was in the shortening of connections and reduced risk of damage in alighting. These changes did not produce any material improve- ment in the speed (about 5 per cent.), but with same fuel consumption an 18 per cent, increase in range at cruising speed was obtained. To enable flight with motors par- tially out of action, the wing span was increased to 96|ft. Another Blohm & Voss The BV 128, a three-engined monoplane powered by Junkers Jumo 205c engines, was the first flying boat con- structed by the Blohm and Voss company, and differs \ tonsiderably in its structural design from the previous German types. To obtain the best possible field of fire to the rear, the usual method of construction was abandoned, and instead of being carried on the stern of a long hull, the tail sur- faces are supported by two cantilever booms growing out of the trailing edge of the wings and tapering to the rear. These booms are placed behind the outboard engines. This arrangement has enabled the hull to be kept within relatively short dimensions, resulting in good manoeuvrability on the water. It has also made possible the provision of two rear gun positions covering the entire space above and below the tail surfaces. THE "FLYING SLIPPER " : The Blohm & Voss BV 138B long-range reconnaissance flyingboat designed by Dr. R. Vogt. has an all-up weight of 26,180 lb. and, powered by three Junkers Jumo 205 engines of 600 h.p. each, develops a maximum speed of 171 m.p.h. The BV 139, known before the war as the Nordwind, is one of the Lufthansa typesmodified for military use. It is powered with four Junkers Jumo 205c engines of 600 h.p. each, and is at present employed for mine laying. The three Junkers Jumo 205 twelve-cylinder compres- sion-ignition engines of 600 h.p. each are arranged in an unusual way. The two lateral engines are mounted left and right on the leading-edge, while the third is placed above the centre of the wing on a vertical streamlined pedestal. The two outboard engines drive three-bladers, the central a four-bladed airscrew to enable a small dia- meter to be used. The wing, which is in three sections, is mounted imme- diately above the hull. The centre section is straight and untapered, while the outer sections are tapered and con- nected to the centre section at a dihedral angle of i\ deg. by flange couplings. As in all BV types designed by Dr. Vogt, the centre-section tubular spar is made of chrome- molybdenum steel (rolled to half shells and welded together). In the outboard sections the tubular spar is of riveted Duralplat, and serves also as fuel tank. The centre section is covered with flush-riveted smooth sheet, and the outer sections with fabric. Wings are joined at four points to the fuselage by means of flange plates welded to the tubular centre-section spar and riveted to the main fuselage bulkheads. All-metal outboard floats are mounted under outer wings. The mooring compartment in the nose of the aircraft has a gun position immediately behind it. The adjoining com- partment, allotted for the accommodation of the crew, is raised, and gives a free field of vision over the gun position. Next is a wireless and navigation room followed by an instrument compartment and a rest room for the crew. With an empty weight of 17,825 lb. and an all-up weight of 26,180 lb., the BV 138B has a span of 88ft. 7m., length 65ft. 3in., and a wing area of 1,205 S1- ft- The wing load- ing is 21.73 lb./sq. ft. and power loading 13.33 lb./h.p. The aircraft cruises at 146 m.p.h. and climbs to 3,280ft. in 4.5 min. The maximum speed js 171 m.p.h. and range 1,480 miles. A development of the BV 139 is the BV 140, a mid- wing cantilever monoplane twin-float seaplane. Powered with two B.M.W.132 DC 9-cylinder air-cooled engines of 880 h.p. each, the aircraft has an empty weight of 13,860 lb., a military load of 1,760 lb., and a loaded weight of 18,700 lb. Wing loading is 19.88 lb./sq. ft., and power loading 11.66 lb./h.p.
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