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Aviation History
1949
1949 - 0305.PDF
February 17th, 1949 FLIGHT 199 /. M.-27 Pulqui jet fighter. and was renamed Instituto Aerotdcnico. It was decided that the factory would concentrate on experimentation, development and production of nationally designed air- craft and engines. The first- manifestation of this change of policy was~sefn inthe I.Ae-21 alj-metal advanced trainer for -the Escuela de Aviation Milifcarr However, owing to shortages of metals, the design team had to revert to national woods, ihe I.A6-21 being discarded and the all- wood/ L.Ae'rD.L,--22 advanced trainer being developed, the prototype of which was flown for the first time in May, 1943. Some hundreds of these aircraft have been built, in two versions, powered alternatively by the home- designed El Gaucho radial, or the Armstrong Siddeley Cheetah 25. Both versions are in service and are used for advanced flying, gunnery and bombing training. Outside Influence on Design In 1944, the Institute designed and built a prototype of a troop-carrying glider known as the Manque, based upon the Waco CG-4A, from which it differed in very few respects. It had accommodation for some fifteen troops or could carry a standard 75mm howitzer. Quantity pro- duction was hot undertaken. A derivative of the Stieglitz produced in 1945 was the I.A6-23, an aerobatic training biplane powered by the Siemens Sh 14A radial. Constructed of national woods, it was produced in limited numbers for the military, flying schools and clubs. Argentina's first " twin " was the I.A6-24 Calquin (Royal Eagle) twin-engined attack bomber, a design obviously inspired by the Mosquito. First flown in June, 1946, the Calquin was originally designed with the Rolls-Royce Merlin in view, but as that engine was not available in sufficient quantities, the initial production version, now in service in some numbers, has been powered by two 1,050 h.p. Pratt & Whitney R-i83o-SC-G Twin Wasp radials which jgive a maximum speed of 292 m.p.h. In keeping with me "Calquin's Mosquito-like appearance, con- struction is all wood, Ut has a crew of two and carries an internal bomb load of 1,650 pounds. Armament con- sist* of four 20-mm Hispano 804 cannojt in the nose, and launching rails for twelve rockets are mounted outboard of the engine nacelles. ' * Production of a 4p4-m.p.h. Merlin-powered version is planned for this year. Despite comparative inexperience in the production of high-speed aircraft, the Institute has already entered the field of jet propulsion with an original design by M. Emilio Dewoitine for a single-seat fighter—the I.A^-27 Pulqui (Arrow), which flew for the first time on August 9th, 1947. A single Rolls-Royce Derwent 5 mounted in the fuselage gives a maximum speed of 528 m.p.h. Four 20-mm cannon are carried. The Pulqui has a span of 36ft nin, and its length is 31ft 9$in. Reports indicate that flight trials with .the prototype have not proved entirely successful, and it is doubtful whether the type will be placed in production. The Institute's latest trainer is the I.A6-31 Colibri (Humming Bird), first flown on September 15th, 1947, after progressing from initial drawings to flight trials within nine months. At present the Colibri is powered by a Cirrus Major III, although the Gipsy Major 10 will be installed in production aircraft. Tests with iihe prototype have proved very satisfactory and the Colibri will be produced in quantity for the flying clubs. Most recent design to emerge from the Institute, the I.Ae-30 Namcu single-seat fighter, was designed by Ing. Pallavicino, and first flew last July. Having the appear- ance of a Hornet/Welkin hybrid, the Namcu is powered by two 2,035 h.p. Merlin 134/135 engines driving "handed" D.H. four-bladed airscrews. As in the Hornet, the coolant air intakes are in the leading-edge of an extended whig centre-section. Armament is heavy, con- sisting of six 20-mm cannon mounted in the underside of the nose, with provision for carrying one 550-lb bomb beneath the fuselage. Leading particulars are: Span, 49ft 2in ; length, 37ft g^ia ; height, 15ft. nin ; all-up weight, 19,380 lb. No details of the Namcu's performance have as yet been divulged, but it is estimated that maximum speed is approximately 430 m.p.h. During 1939, the Institute (then the Military Factory) designed and built the prototype of a two-seat light cabin monoplane known as the El Boyero. A licence for its manufacture was granted to the S.A. Sfreddo y Paolini but, owing to the difficulty of acquiring the necessary equipment and materials at that time, production was shelved. Con- struction has now been taken over by the S.A. Estable- cimientos Aeronauticas^etrolini Hennanos of Moreno, who have received an order from the Government for 160 El Boyeros for the flying clubs. Designed by Senor J. A. Peretti, the El Boyero is a two- seat high-wing fabric-covered monoplane of mixed wood and steel construction, following the Piper Cub motif. At present, a 65 h.p. Continental A-65 engine is installed but, alternatively, the 75 h.p. Continental C-75 can be fitted. The Companhia Industria Metalurgica & Plastica S.A. of Buenos Aires entered the aircraft industry in 1941, with the Impa RR-11 two-seat cabin monoplane. Quantity pro- duction was not undertaken. This company's second design, the Impa Tu-Sa-O, appeared in April, 1943, and (Concluded on page 203)
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