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Rogožarski SIM-X / SEA-JEEP / SI-GIP
Aircraft SIM X was designed by Sima Milutinovic at the beginning of the 1936, drawing on the positive experiences of his previous SIM-II and SIM-VIII.The Rogozarski SIM-X (Serbian: Рогожарски СИМ-X) was a 1936s Yugoslav Sports and tourist plane and for basic training of military pilots. It was designed and built at the Rogožarski factory in Belgrade.

The prototype aircraft was built at Rogožarski from August until the end of the 1936. The first test flight took place on 1936. The SIM X had parasol monoplane with one engine, a wooden two blade propeller, with two crew members in tandem. The aircraft was registered YU-PDY.

While the plane was designed for three types of engine mounting: Walter NZR 120 hp, Siemens 110 hp and Gypsy Major 120 hp: the production incorporated a Walter NZR 120 hp air-cooled radial with reduction gear which was produced locally by Vlajković in Belgrade. The plane was mostly wooden construction, the fuselage of elliptical cross-section made entirely of wood covered with plywood, and the wings made of wood covered with cloth, with rounded ends. On each side, the wings are supported by a pair of inclined struts from the fuselage. The fuel tank was located in the central part between the wings. Landing gear was fixed, no axles, completely made of steel pipe.

A trainer single-engine two-seater plane for the initial training (21 units, 1937)
The Rogožarski SEA-JEEP was a modification of SIM X with Gypsy Major engine (1 converted SIM-X, 1940)
A second Rogožarski SEA-JEEP was a modified SIM-X plane for a school night flying (1 converted SIM-X 1941)

Rogozarski SIM-X First variant with Walter NZR engines 120 hp, 21 built (1) prototype 1936 (10 airplane) 1937 and (10 airplane) 1938

Rogozarski SI-GIP
Second variant with Gipsy Major engines 132 hp, 1 built (conversion) in 1940.

Rogozarski SIM-Xa
Third variant instrument flight aircraft with Walter NZR engines 120 hp, 1 built (conversion) in 1941. 

Engine: 1 × Walter NZR 6-cylinder radial, 89 kW (120 hp)
Propellers: 2-bladed    Crew: 2
Wingspan: 10.00 m (32 ft 10 in)
Wing area: 18.50 sq.m (199.1 sq ft)
Length: 6.96 m (22 ft 10 in)
Height: 2.70 m (8 ft 10 in) 
Empty weight: 543 kg (1,197 lb)
Gross weight: 785 kg (1,731 lb)
Maximum speed: 202 km/h (126 mph; 109 kn)
Cruising speed: 168 km/h (104 mph; 91 kn)
Minimum control speed: 72 km/h (45 mph; 39 kn)
Range: 560 km (348 mi; 302 nmi)
Service ceiling: 5,500 m (18,045 ft)
Rate of climb: 4.17 m/s (821 ft/min)

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