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Aviation History
1941
1941 - 0682.PDF
224 20TH, T941- NORTH AMERICAN NA-73 NEWS from THE STATES Some Interesting Items of Design, Output and Performance Northrops are turning out one a week of these N3 P.B. bombers for the NorwegianAir Force in England. The engine is a Wright Cyclone of 1,200 h.p. and the speed 235 m.p.h. A bomb load of 2,000 lb. can be carried. Gross weight is 8,500 lb. Plan, side and front elevation of theNorth American Mustang fighter (Allison). \m CHIEF MARSHAL SIR HUGHf-\ DOWDING, A.O.C. - in - C. •*• •*• Fighter Command during lastautumn's blitz., is in the States on a special mission for the Ministry of Air-craft Production. The newspaper re- porters have learned of his nickname" Stuffy " and are working it to death. He told them that the Martin Mary-land was in use in the Middle East— which was not news—but went on tosay that the Curtiss Tomahawks were doing well after modification. TheDouglas Boston, l>e said, was to per- form a dual role—presumably high-speed attack-bomber and night fighter —and he also stated that bomberssuch as Lockheeds and Liberators were flying the Atlantic all the time.Answering a question, he said that no inferior petrol had been found in the tanks of captured German aircraft,but some strange stuff had been found in German transport tanks. The general arrangement drawingsof the North-American Mustang (1,100 h.p. Allison) shown at the top of thepage, give this machine the appear- ance of being a very eyeable job. Theradiator so far aft implies a consider- able amount of plumbing and thecooling system is one of the most vulnerable parts of a liquid-cooled en-gine. Reverting for a moment to the Martin Maryland. Those which havebeen delivered are the ones originally ordered by the French, and it is in-teresting to learn that Martins propose restarting a 100-a-month assembly lineon a modified type for the R.A.F. The works designation of this will beMartin 167.B4. For the U.S. Army Air Corps the Martin B.26 mediumbomber (two Pratt and Whitney 1,850 h.p. Double Wasps) has gone into massproduction off the drawing-board without waiting for the prototype tofinish its trials. This machine has been nicknamed the flying torpedo. Itweighs some 26,625 lb. all up and has a tricycle undercarriage. It has beenstated that this is very similar to the model which is in production for theR.A.F., and it can therefore be con- sidered as identical with the Balti-more. (Some notes on this machine appeared in our issue of January 23,1940.) Other news from the assembly lines is that Lockheeds are turning outfour Hudsons a day for the Coastal Command and Northrops one a weekof the N3 PB. floatplanes. Informa- tion from one source credits the G-rum-man Martlet as now produced for the R.A.F. with a considerably increasedperformance. Top speed is now* stepped up to 350 m.p.h. and the ser-vice ceiling from 28,000ft. to 37,000ft. The sectional drawing below shows,among other features, how the o.5in.- machine guns lie along the cylinderbanks of the Allison engine and also how the ends of the instrument panelhave been shaped to enable the pilot to get at the cocking handles. This sectional sketch shows the interior economy of the Curtiss Tomahawk. By courtesy of "Aviation." I
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