The original major upgraded prototype flew November 1943, after initial tests received Klimov VK-107A. Last of 3921 WW II Yak-9U delivered August 1945."
Max. speed: 418 mph (672 kmh) at 16,404 ft (5000 m)
Ceiling: 34,941 ft (10.650 m)
Range: 419 miles (675 km)
Weight: 5,538 lb (2,512 kg)
Max. T/O: 7,064 lb (3,204 kg)
Span: 31 ft 11.5 in (9.74 m)
Length: 28 ft 0.6 in (8.55 m)
Wing Area: 1844.6 sq.ft (17.15 sq.m)