The VG 39 development in the VG 30 series of fighters commenced its flight test programme on 3 May 1940. The prototype differed from the VG 33 mainly by having a 1200hp Hispano-Suiza Type 89ter 12-cylinder liquid-cooled engine with an elongated propeller shaft, a revised wing structure, and a wing-mounted armament of six 7.5mm MAC 1934 M39 machine guns.
During flight testing the prototype VG 39 attained a maximum speed of 625km/h at an altitude of 5750m. The planned production model, the VG 39bis, was to have embodied a fuselage similar to that of the VG 36 and to have supplemented the wing armament with a 20mm engine-mounted cannon, the definitive model having a 1600hp Hispano-Suiza 12Z engine.
Wingspan: 10.80 m / 35 ft 5 in
Length: 8.75 m / 28 ft 8 in
Wing area: 14.00 sq.m / 150.69 sq ft
Max. speed: 625 km/h / 388 mph