Humu was a Finnish fighter designed in 1942 by Valtion Lentokonetehdas (State Aircraft Factory) and based on the Brewster B-239 "Buffalo". Humu was constructed with plywood wings and was to be equipped with captured Russian aircraft engines.

Information about the Brewster B-239

Valtion Lentokonetehdas manufactured a wooden wing which was tested in BW-392 with the Russian M-63 engine and three fuselage mounted fuel tanks. BW-392 stalled in start and the pilot was killed. After further experimentations the production of the Humu was cancelled as the proposed fighter would have had worse specifications than the B-239 which was already becoming obsolete.

After the armistice in 1944 a single prototype Humu (HM-671) was constructed for testing purposes.

The Humu prototype has survived and is on display in Keskisuomen Ilmailumuseo at Tikkakoski. Though it is not an original Brewster built aircraft, it is still the only wartime survivor of the F2A/B-239/B-339/B-439 family. Photo: Matti Yrjölä, 1993.

Humu specifications
Measurements:	Same as B-239
Empty weight:	2050 kg
Max weight:	2895 kg
Powerplant:	1000 HP Shevtshov M-63
Max speed:	430 kmph at 4600 meters.
Service ceiling:	8000 meters. Climb to 4000 meters: 5 minutes.
Armament:	2 x 12,7 mm machine guns in the fuselage

War-booty Russian Shvetshov M-63 engine was used in Humu.
Photo: Matti Yrjölä, 1993.