Laville DI-4 (Russian: Лавиль ДИ-4) was a prototype two-seat fighter aircraft developed in the Soviet Union in the 1930s.
The chief designer Henri Laville was one of several French aviation specialists invited to work in the Soviet Union and the DI-4 layout was typical of the French trend at the time with a high-mounted gull wing (first for a Soviet aircraft) and all-metal construction.
First flying on 4 January 1932, the test flight program was completed in 1933 but despite good performance the aircraft did not enter mass production, in part because Soviet Union had no plans to purchase the Curtiss V-1570 engine. Only the one was built.
Powerplant: × Curtiss V-1570 Conqueror, 448 kW (601 hp)
Propeller: 2-blade fixed-pitch
Wingspan: 13.3 m (43 ft 8 in)
Wing area: 23.9 m2 (257 sq ft)
Length: 8.5 m (27 ft 11 in)
Empty weight: 1,448 kg (3,192 lb)
Gross weight: 1,949 kg (4,297 lb)
Maximum speed: 266 km/h (165 mph, 144 kn)
Range: 500 km (310 mi, 270 nmi)
Service ceiling: 6,440 m (21,130 ft)
Time to 5,000 m (16,404 ft): 17 minutes
Wing loading: 81.5 kg/m2 (16.7 lb/sq ft)
Power/mass: 0.230 kW/kg (0.140 hp/lb)
Horizontal turn time: 15 seconds
Crew: 2
All Aero 