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URMV-3 IS-3
The IS-3 was the basis of a family of high performance gliders designed by Iosif Şilimon and built in Romania in the 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-3 was designed as a high performance sailplane for record-breaking and international competition flying. The development of the IS-3 was in four distinct phases with differences in wing position and construction as well as fuselage design. The original glider, first flown on 19 August 1953, was built primarily of wood with a pod and boom style fuselage and high-set wings. The streamlined pod contained the enclosed cockpit with flush fitting canopy and supported the wings and the Duralumin sheet tubular tailbboom which supported the conventional tail surfaces at its extremity. The tapered wings were built with plywood-covered torsion box leading edges with fabric covering aft of the main spar, incorporating spoilers for approach control and differential ailerons to reduce adverse yaw. With the exception of the IS-3c and IS-3d the IS-3 family followed the pod and boom arrangement with variations in wing position, span, wing construction and undercarriage arrangement.〔
All versions had a single mainwheel with nose and tail skids, varying in skid sizes and mainwheel position. The IS-3c and IS-3d were drastically different in having a conventional wooden fuselage and further minor variations in wing construction and roll controls.〔
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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