Ilyushin Il-4

Infobox Aircraft
name = Ilyushin Il-4
type = Bomber, torpedo-bomber
manufacturer = Ilyushin



caption =
designer =
first flight = March 31 1936
introduced =
retired =
status =
primary user = Soviet Air Force
more users =
produced = 1936-1939 (DB-3), 1942-1944 (Il-4)
number built = 1,528 (DB-3), 5,256 (Il-4)
unit cost =
developed from = Ilyushin DB-3
variants with their own articles =

The Ilyushin Il-4 was a Soviet World War II bomber aircraft, widely used by the Soviet Air Force (VVS, "Voenno-Vozdushnye Sily") although not well known. Its NATO code-name was Bob.

Design and development

;DB-3The Il-4 started life as a quickly produced bomber prototype called the TsKB-26. Parts of the fuselage and cockpit were taken from the TsKB-12 (Polikarpov I-16) fighter, married to new wings made of welded steel U-beams and tubes. Only a few were built before attention turned to the updated TsKB-30, which included a new fuselage using the same construction methods. Welding the beams required three welds per joint, so the plane took a huge amount of time to build. Nevertheless the design had excellent range and was quite sturdy. It was put into production in 1936 as the DB-3, 1,528 being completed by 1939.

;DB-3MDB-3 was followed by the updated DB-3M, which looked similar with the exception of a much larger and more rounded nose. However the plane was actually quite different internally. Using lessons learned from the Li-2 (Douglas DC-3) the entire plane was re-built using T shaped formers instead of the tubes and U-beams. This led to a tremendous reduction in the time needed to build the plane, and the DB-3M was hurriedly put into production.

;DB-3F / Il-4A change of engine from the 950 horsepower (708 kW) M-87B to the 1,100 hp (820 kW) M-88 resulted in the DB-3F, which were eventually renamed in 1942 as the Il-4. Some series had wooden outer wings and front fuselage to conserve metals, and throughout the production engines and fuel tanks were upgraded for more performance while keeping the same range. However the most notable change was the addition of larger defensive guns in the turret, using the 12.7 mm UBT in place of the earlier 7.62 mm weapons. In addition it was found that the gunners were attacked first, so blocks of armor were placed around the gunner positions.

All this extra weight wasn't offset by the newer engines however, and the Il-4 proved to be slower than the earlier versions at only 404 km/h. An attempt to improve performance was made as the Il-6, adding large diesel engines and heavier armament. The engine proved unreliable and production was never started. The Il-4 remained in production until 1944, when just over 5,200 had been built.

Operational history

Although the Il-4 was only a medium bomber, it had the range to be used on strategic missions. The VVS wasn't terribly interested in this role, but nevertheless the Il-4 was used on several highly publicized raids against Berlin. Most would be used on much shorter range missions, often adding another 1,000 kg of bombs under the wings, in addition to the internal 2,500 kg.

Finland bought four captured DB-3Fs from German stocks. These were given the Finnish Air Force serials DF-22 to DF-25 and flown from Bryansk, Russia to Finland (one aircraft, DF-22, was destroyed en route and crashed near Syeschtschinskaya airfield). The aircraft were later flown by No. 48 Sqn during 1943 (DF-23, DF-24 and DF-25), No. 46 Sqn during 1944 (DF-23 and DF-24) and No. 45 Sqn for a short time in 1945 (DF-23), until the last remaining serviceable aircraft went into depot, February 23 1945 [Keskinen et al 1982, p. 79,94.] .

Operators

;China as ROC:
*Chinese Nationalist Air Force 24 aircraft;FIN
*Finnish Air Force 11 aircraft of the type DB-3M and 4 aircraft of the type DB-3F (Il-4);flag|Germany|Nazi
*Luftwaffe;USSR
*Soviet Air Force
*Soviet Naval Aviation

pecifications

aircraft specifications
plane or copter?= plane
jet or prop?= prop
ref=
crew= Three
capacity=
length main= 14.80 m
length alt= 48 ft 6.75 in
span main= 21.44 m
span alt= 70 ft 4.5 in
height main= 4.10 m
height alt= 13 ft 5.5 in
area main= 66.7 m²
area alt= 718 ft²
airfoil=
empty weight main= 5,800 kg
empty weight alt= 12,787 lb
loaded weight main=
loaded weight alt=
useful load main=
useful load alt=
max takeoff weight main= 11,300 kg
max takeoff weight alt= 24,912 lb
more general=
engine (prop)= Tumansky M-88B
type of prop= radial engines
number of props=2
power main= 820 kW
power alt= 1,100 hp
power original=
max speed main= 430 km/h
max speed alt= 232 knots, 267 mph
cruise speed main=
cruise speed alt=
never exceed speed main=
never exceed speed alt=
stall speed main=
stall speed alt=
range main= 3,800 km
range alt= 2,052 nm, 2,361 miles
ceiling main= 9,700 m
ceiling alt= 31,825 ft
climb rate main=
climb rate alt=
loading main=
loading alt=
thrust/weight=
power/mass main=
power/mass alt=
more performance=
armament=
* 2 × 7.62 mm ShKAS machine guns
* 1 × 12.7 mm Berezin UB machine gun
* Up to 2,500 kg (5,500 lb) of bombs or mines. Alternatively one 940 kg (2,072 lb) 45-36-AN or 45-36-AV torpedo
avionics=

References

Notes

Bibliography

* Gordon, Yefim and Khazanov, Dmitri. "Soviet Combat Aircraft of the Second World War, Volume 2: Twin-Engined Fighters, Attack Aircraft and Bombers". Earl Shilton, UK: Midland Publishing Ltd., 2006. ISBN 1-85780-084-2.
* Keskinen, Kalevi; Stenman, Kari and Niska, Klaus. "Suomen Ilmavoimien Historia 9, Venäläiset Pommittajat (Soviet Bombers)". Espoo, Finland: Tietoteos, 1982. ISBN 952-99432-7-X.
* Nowarra, Heinz J. and Duval, G.R. "Russian Civil and Military Aircraft, 1884-1969". London: Fountain Press Ltd., 1971. ISBN 0-852-42460-4.
* Stapfer, Hans-Heiri. "Ilyushin Il-4 in Action (aircraft number 192)". Carrollton, Texas: Squadron/Signal Publications, Inc., 2004. ISBN 0-89747-471-6.

ee also

aircontent
related=
*Ilyushin DB-3
*Ilyushin Il-6
similar aircraft=
*B-25 Mitchell
*Heinkel He 111
sequence=

lists=
* List of military aircraft of the Soviet Union and the CIS
* List of bomber aircraft
see also=