The Cijan-Obad Orao (English: Eagle) is a competition single seat sailplane designed in Yugoslavia just after World War II, one of the most advanced of its type at the time.
[1] The Orao II is a cantilever, shoulder wing monoplane chiefly built of wood with plywood and fabric covering but with a slightly forward swept light alloy spar.
Aft of the wings the fuselage is a monocoque, skinned with stringers and balsa filling sandwiched between two ply sheets over wooden hoops.
The fuselage underside was reshaped to distribute landing loads better and the fin was increased in area with a shallow dorsal fillet.
The horizontal tail was made narrower, with straight taper and all ply covered, placed far enough forward so no rudder cut out in the now horn balanced elevators was required.
The modifications added about 50 kg (110 lb) to the empty Orao IIC; the improved aerodynamics raised the glide ratio from about 32:1 to 36:1.
[1][2] In 1949 the Orao attended its first competition, the Yugoslavian National Championships, where Milan Borisek set a new Yugoslav distance record of almost 600 km (373 mi) from Subotica to Salonika in Greece.
Its appearance and performance attracted much attention and prompted supervised comparative tests, without the WGC, of the Orao with the Weihe of Paul MacCready.