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URMV-3 IS-4
''Not to be confused with the IS-4 Jastrząb from Instytut Szybownictwa in Poland.''
The IS-4 was a high performance glider designed by Iosif Şilimon and built in Romania in the late 1950s at the URMV-3 (Rom: ''Uzinele de Reparatii Material Volant-3'' - Glider repair and manufacture factory) factory at Braşov.〔
==Design and development==
The IS-4 high-performance glider followed the layout of the earlier IS-3d, constructed largely of wood with plywood and fabric skinning. The high-set cantilever wings with moderate dihedral (2º 30') were built with a single main spar with a plywood covered leading egdge torsion box. The ovoid section fuselage was of monocoque construction with plywood skin with a streamlined full-length cockpit canopyforward of the wings. The undercarriage consisted of a balloon main-wheel with nose and tail skids. Flying controls were largely conventional with plywood skinned fixed portions and fabric covered wooden built up movable surfaces. Pitch trim was achieved by a trim tab on the elevators and adverse yaw was alleviated through the use of differential ailerons.〔
Very little is known of the IS-4s development or operational history.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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