1307 / IF

The FF program was an update of the production MiG-9 or FS that boosted the engines’ thrust and reinforced the pilot’s armor protection.

The BMW 003 turbojets were retooled in factory no. 17 in Kazan. This modification was at the heart of the RD-20F, later redesignated the RD-21 and built entirely with components and accessories made in the USSR. The thrust of the hotted-up engine increased to 980 daN (1,000 kg st). The brakes were also improved, and 12-mm armor plates were installed in the front and rear of the cockpit, and the windshield front glass panel was replaced by a pane of bulletproof glass 44 mm thick. The total weight of the armor was 60 kg (132 pounds). Wheel braking was much improved. Externally very similar to the FS, the FF left the factory and made its first flight in September 1947,1. T. Ivashchenko at the controls. Tests were completed by the end of the year, and the FF was produced in small quantities with the same armament as the FS.

Specifications

Span, 10 m (32 ft 9.7 in); length, 9,83 m (32 ft 3 in); height, 3.225 m (10 ft 6.7 in); wheel track, 1.95 m (6 ft 4.8 in); wheel base, 3.072 m (10 ft

0.9 in); wing area, 18.2 m2 (195.9 sq ft); empty weight, 3,471 kg (7,650 lb); takeoff weight, 5,117 kg (12,278 lb); fuel, 1,300 kg (2,865 lb); wing loading, 281.2 kg/m2 (57.6 lb/sq ft).

Performance

Max speed, 950 km/h (513 kt); climb to 5,000 m (16,400 ft) in 2.9 min; service ceiling, 13,000 m (42,640 ft).