Ilyushin Il-2 Sturmovik

 

1st Flight 1939

The Ilyushin Il-2 Sturmovik was a ground-attack aircraft produced by the Soviet Union in large numbers during the Second World War. 

The early two-seater prototype proved to be too heavy for the limited power of the early AM-35 engine.

A redesigned single-seat version was soon developed and saw combat, particularly in the early phase of the war in the Soviet Union.

While the Il-2 proved to be a deadly air-to-ground weapon, heavy losses were caused by its vulnerability to fighter attack. Consequently, in February 1942, the two-seat design was revived.

The Il-2M, with a rear gunner under the stretched canopy, entered service in September 1942 with the surviving single-seaters eventually modified to this standard.

Later changes included an upgrade from 20 mm (0.79 in) to 23 or 37 mm (0.91 or 1.46 in) cannons, aerodynamic improvements, use of wooden outer wing panels instead of metal and increased fuel capacity.

In 1943, the Il-2 Type 3 or Il-2m3 came out with redesigned “arrow-wings” that possessed leading edges that were swept back 15 degrees on the outer panels, and nearly straight trailing edges, resulting in a wing planform somewhat like the AT-6 trainer.

Performance and handling were much improved from the resulting shift of the Il-2’s aerodynamic center rearwards with the revised “arrow wing” planform to correct the earlier problem, and this became the most common version of the Il-2.

A radial engine powered variant of the Il-2 with the Shvetsov ASh-82 engine was proposed in 1942 to remedy projected shortages in the Mikulin inline engines.

However, the ASh-82 was also used in the new Lavochkin La-5 fighter which effectively secured all available engines to the Lavochkin bureau.

The radial engine Sukhoi Su-2 ground attack aircraft was produced in small quantities, but was generally considered unsuitable due to inadequate performance and lack of defensive armament.

Variants

TsKB-55

Two-seat prototype, AM-35 engine, first flight on 2 October 1939.

BSh-2

VVS designation for TsKB-55 prototype.

TsKB-57

Single-seat prototype, AM-38 engine, first flight on 12 October 1940.

Il-2 (TsKB-57P)

Single-seat serial aircraft, AM-38 engine, first flight on 29 December 1940, some delivered to combat units in May–June 1941.

Renamed the Il-2 in April 1941. Cannons 20 mm ShVAK or 23 mm VYa-23 (depending on which factory the Il-2 was manufactured in).

Il-2 two-seat

Two-seat version, AM-38 engine, first action on 30 October 1942 near Stalingrad. Maximum bomb load reduced from 600 to 400 kg (1,300 to 880 lb).

Used on edges of flight formations for defense against German fighters.

Quickly replaced by the “Il-2 production of 1943”.

Il-2 production of 1943

Referred in the west as the “Il-2M”.

Powered by an upgraded AM-38F engine.

Delivered to the front units from early 1943. In 1943, the 20 mm ShVAK armed Il-2s faded out, leaving only the 23 mm VYa variant.

Il-2 with NS-37

Referred in the west as the “Il-2 Type 3M”.

Based on the two-seat Il-2, armed with Nudelman-Suranov NS-37 in conformal gun pods under the wings, instead of the 20/23 mm cannons, this version is an attempt to create an anti-tank aircraft, first used in combat during the Battle of Kursk.

However, the combat effectiveness was quite low and production of the variant was limited to about 3,500.

Moreover, bomb load was decreased from 600 to 200 kg (1,300 to 440 lb). It was replaced by the conventional Il-2 attackers armed with cassettes with cumulative bomblets.

Referred in the West as “Il-2M3” or “Il-2 Type 3”.

As more duralumin became available for the Soviet aviation industry, the Il-2 received a set of all-metal wing panels.

At the same time, the outer wing planform was swept back, with a straight trailing edge, since the centre of gravity was shifted rearwards after the gunner was added.

The wing planform change regained controllability of the two-seat Il-2 back to level of the single-seat Il-2.

Il-2U

Training version, also known as UIl-2.

Il-2T

Torpedo bomber version for the Soviet Navy with the VYa-23 cannons removed to save weight, it was able to carry a single 45 cm (18 in) torpedo.

Evidently, it was only a design as the 23rd Attack Air Regiment of the Black Sea Fleet flew regular Il-2M-3s fitted with torpedo racks as a field modification, and that no such aircraft were ever noted in the battle sortie logs.

Il-2I

Armoured fighter, prototype only.

Concept based on several dogfights between Il-2 and Luftwaffe bombers.

Proved infeasible due to its low speed, which causes it to be able to intercept only older Luftwaffe bombers.

Il-2 with M-82

A backup project prepared while plants producing AM-35/AM-38 were evacuated.

Trials demonstrated that with the fighter engine, low-altitude performance and controllability were unacceptable.

Specifications

Crew: 2

Length: 11.65 m (38 ft 3 in)

Wingspan: 14.60 m (47 ft 11 in)

Height: 4.17 m (13 ft 8 in) (tail up)

Wing area: 38.50 m2 (414.4 sq ft)

Empty weight: 4,425 kg (9,755 lb)

Max take-off weight: 6,360 kg (14,021 lb)

Fuel capacity: 730 L (190 US gal; 160 imp gal)

Powerplant: 1 × Mikulin AM-38F liquid-cooled V12 engine, 1,280 kW (1,720 hp) (take-off power),1,100 kW (1,500 hp) at 750 m (2,460 ft)

Propellers: 3-bladed AV-57-158 variable-pitch propeller, 3.60 m (11 ft 10 in) diameter

Performance

Maximum speed: 410 km/h (250 mph, 220 kn) at 1,500 m (4,900 ft)

Range: 765 km (475 mi, 413 nmi) at 275 km/h (171 mph; 148 kn) and 1,000 m (3,300 ft)

Endurance: 2.75 hr

Service ceiling: 4,525 m (14,846 ft) (service ceiling), 6,360 m (20,870 ft) (absolute ceiling)

Time to altitude: 15 min to 5,000 m (16,000 ft)

Armament

Guns:

2 × fixed forward-firing 23×152mm VYa-23 cannons, 150 rounds per gun

2 × fixed forward-firing 7.62×54mmR ShKAS machine guns, 750 rounds per gun

1 × manually aimed 12.7×108mm Berezin UBT machine gun in rear cockpit, 300 rounds

Rockets:

8× RS-82 rockets or

4× RS-132 rockets

Bombs:

6× 100 kg (220 lb) bombs in wing bomb-bays and under wing or

4× dispensers for 48 2.5 kg (5.5 lb) PTAB anti-Armor bombs (192 total) in wing bays.

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