The Ilyushin Il-28 (Russian: Илью́шин Ил-28; NATO reporting name: Beagle) is a jetbomber of the immediate postwar period that was originally manufactured for the Soviet Air Forces. It was the Soviet Union's first such aircraft to enter large-scale production. It was also licence-built in China as the Harbin H-5. Total production in the USSR was 6,316 aircraft, and over 319 H-5s were built. Only 187 examples of the HJ-5 training variant were manufactured. The only H-5s in service currently are approximately 80 aircraft which operate with the Korean People's Air Force.[1]
The Il-28 has the USAF/DoD reporting name "Type 27"[2] and ASCC reporting name "Beagle",[3] while the Il-28U trainer variant has the USAF/DoD reporting name "Type 30"[2] and NATO reporting name Mascot.[4][5]
Design and development
After a number of attempts at a four-engined bomber (the Lyulka TR-1 powered Ilyushin Il-22 and the unbuilt Rolls-Royce Derwent powered Ilyushin Il-24), the Ilyushin Design Bureau began development of a new jet-powered tactical bomber in late 1947.[6] Western intelligence focused on the four-engine developments while the twin-engine Ilyushin Il-28 was created to meet a requirement for a bomber to carry a 3,000 kilograms (6,600 lb) bombload at 800 kilometres per hour (500 mph).[7][8] The new design took advantage of the sale of a number of Rolls-Royce Nene jet engines by Great Britain to the Soviet Union, which allowed Soviet engineers to quickly produce an unlicensed copy of the Nene, the RD-45, with Ilyushin designing the new bomber around two RD-45s.[7]
The Il-28 was smaller than the previous designs and carried a crew of only three (pilot, navigator and gunner). It was also smaller than the competing design from the Tupolev design bureau, the three-engined (i.e. two Nenes and a Rolls-Royce Derwent) Tupolev Tu-73, which had been started long before the Ilyushin project, and flew before the design of the Il-28 was approved.[7]
The Il-28 design was conventional in layout, with high, unswept wings and a swept horizontal tail and fin. The engines were carried in bulky nacelles slung directly under the wings. The nosewheel retracted rearwards, while the mainwheels retracted forwards into the engine nacelles. The crew of three were accommodated in separate, pressurised compartments. The navigator, who also acted as bombardier, was accommodated in the glazed nose compartment and was provided with an OPB-5 bombsight based on the American Norden bombsight of the Second World War, while the pilot sat under a sideways opening bubble canopy with an armoured windscreen. The gunner sat in a separate compartment at the rear of the fuselage, operating a power driven turret armed with two Nudelman-Suranov NS-23 23 mm cannons with 250 rounds each. In service, the turret was sometimes removed as a weight saving measure.[9] While the pilot and navigator sat on ejector seats, the gunner had to parachute out of a hatch in the floor in the event of an emergency. Two more fixed, forward-firing 23 mm cannon with 100 rounds each were mounted under the nose and fired by the pilot, while a bomb bay was located in the fuselage, capable of holding four 100 kg (220 lb) bombs in individual containers, or single large bombs of up to 3,000 kg (6,600 lb) slung from a beam in the bomb bay.[10][11]
One unusual design feature of the Il-28 was that the wings and tail were split horizontally through the centre of the wing, while the fuselage was split vertically at the centreline, allowing the separate parts to be built individually and fitted out with systems before being bolted together to complete assembly of the aircraft.[12] This slightly increased the weight of the aircraft structure, but eased manufacture and proved to be more economical.[13][14]
The first prototype, powered by two imported Nenes, made its maiden flight on 8 July 1948, with Vladimir Kokkinaki at the controls. Testing was successful, with the Il-28 demonstrating good handling and reaching a speed of 833 km/h (518 mph). It was followed on 30 December 1948 by the second prototype, with Soviet built RD-45 engines replacing the Nenes.[15] After the completion of state tests in early 1949 the aircraft was ordered into large scale production on 14 May 1949, with the Klimov VK-1, an improved version of the RD-45 to be used in order to improve the aircraft's performance.[16][17] The first pre-production aircraft with VK-1 engines flew on 8 August 1949, and featured reshaped engine nacelles to reduce drag, while the radome for the navigation radar was moved from the rear fuselage to just aft of the nosewheel.
Full production in three factories started in September 1949, with service deliveries starting in early 1950, allowing 25 Il-28s to be displayed at the Moscow May Day parade of 1950 (as ordered by Joseph Stalin when it was ordered into production in 1949).[18][19] The Il-28 soon became the standard tactical bomber in the Soviet forces and was widely exported.[16]
Operational history
The Il-28 was widely exported, serving in the air arms of some 20 nations ranging from the Warsaw Pact to various Middle-Eastern and African air forces. Egypt was an early customer, and targeting Egyptian Il-28s on the ground was a priority for the Royal Air Force during the Suez Crisis and later by the Israeli Air Force during the Six-Day War, and Yom Kippur War.
The Soviet Union was in the process of providing the type for local assembly in Cuba when this was halted by the Cuban Missile Crisis, after which Nikita Khrushchev agreed to remove them. The type also saw limited use in Vietnam and with the Afghan forces in Afghanistan. Four ex-Egyptian and two ex-Soviet Il-28s (all with Egyptian crews) were operated by the Nigerian Air Force in the Biafra Wars. Finland also had four examples of this type delivered between 1961 and 1966 for target-towing duties. They remained in service until the 1980s.
The Soviet Union had relegated the Il-28 to second-line duties by the late-1950s. The supersonic Yak-28 was introduced in the early 1960s to take over the Beagle's low-level attack role; some Il-28 variants lingered in Soviet service into the 1980s.[22][23] The last Soviet-built examples were still flying in Egypt into the 1990s.
The People's Republic of China received over 250 Soviet-built Il-28s from 1952,[24] and when the Sino-Soviet split occurred in the late 1950s, it decided to place the Il-28 into production, despite no manufacturing license being obtained.[25] Chinese-built aircraft differed from the original Soviet aircraft in that they have a redesigned wing structure, abandoning the horizontal manufacturing break, saving 110 kilograms (240 lb) at the cost of a more difficult construction. Chinese aircraft also used a different tail turret based on that of the Tupolev Tu-16, and fitted with faster-firing AM-23 cannons.[26]
Chinese-built Il-28s designated H-5 and built by HAMC were still flying in the 1990s with several hundreds in China itself, and a smaller number in North Korea and Romania. The three main Chinese versions are the H-5 bomber, followed by the HJ-5 trainer, and the H-5R (HZ-5) long range (in comparison to the reconnaissance version of the Shenyang J-6) reconnaissance aircraft, and later, the HD-5ECM/ESM version. The latter two types have been phased out.
The type is known to still be in active service with the North Korean Air Force, although little is known as to whether they are a mix of survivors from the batch of 24 Soviet-manufactured aircraft delivered in the 1960s and some of the newer Chinese-built H-5 variant, or are solely H-5s. Some of these are probably used for spares to maintain a small group of around a dozen serviceable aircraft.[citation needed] They give North Korea a means of bombing targets in South Korea and Western Japan, although they would be vulnerable to modern anti air missiles and interceptors.
Several Ilyushin Il-28s are preserved in museums and as monuments in Russia, Germany, Hungary and in other countries.
Variants
Soviet Union variants
Note: Order of variants determined chronologically by production/development dates.
Il-28
Basic three-seat bomber version, powered by two VK-1 engines.[27]
Il-28U
Unarmed training version fitted with new nose housing cockpit for instructor, while the trainee sat in the normal cockpit. First flown 18 March 1950.[28]
Il-28R
Three-seat tactical photo reconnaissance version, with extra fuel in bomb bay and tip-tanks, and with one forward firing cannon removed. Fitted with revised undercarriage to deal with heavier weights. First flew 19 April 1950.[29][30]
Electronic warfare, electronic jamming version, fitted with wingtip electronic pods housed in the former wing tanks.[9][31]
Il-28T
Torpedo bomber version for the Soviet Naval Aviation able to accommodate two small or one large torpedo (including RAT-52 rocket propelled torpedoes) in a lengthened weapons bay.[32]
Il-28N
Nuclear bomber for the Soviet Air Force with modified bomb-bay and revised avionics. (N - Nositel - carrier, also known as Il-28A - Atomnyy - atomic).[33]
Proposed swept-wing version with more powerful Klimov VK-5 engines. Unbuilt.[33]
Il-28RM
Modified Il-28R with VK-5 engine. One prototype built plus two similarly converted bombers (which carried no special designation) but no production.[33]
Il-28TM
Il-28T with VK-5. One converted, no production.[33]
Il-28PL
High-speed anti-submarine conversion of Il-28 bomber or Il-28T torpedo bomber. Capable of carrying dropping sonobuoys or acoustic homing torpedoes on direction of other anti-submarine assets.[36]
Il-28Sh
Ground attack (Shturmovik) conversion of Il-28 with 12 underwing pylons for rocket pods. Small number converted which saw limited service.[36][37]
Target drone conversion of Il-28. Also known as M-28.[36]
Czechoslovak variants
B-228
Czechoslovak designation of Soviet built Il-28s.[38]
CB-228
Czechoslovak designation of Soviet built Il-28Us.[38]
Chinese variants
H-5
(Hongzhaji - bomber) - Standard three-seat tactical bomber.[39] The structure of the two halves of the Soviet Union's Il-28 aircraft was changed to a common structure. The engine uses WP-5. The tail turret using H-6s caused some changes in the tail structure.
H-5A
Speculative designation of for nuclear capable H-5 variant.[40]
HD-5
(Hongzhaji Dian - bomber/electronic reconnaissance) Chinese ECM jammer version.[41]
HJ-5
(Hongzhaji Jiaolianji - bomber trainer) Chinese trainer version with similar layout to Il-28U.[39][42]
HZ-5
(Hongzhaji Zhenchaji - bomber/reconnaissance) Tactical reconnaissance aircraft. Fitted with underwing drop tanks instead of tip tanks of Il-28R.[39][41]
54 aircraft acquired (including four Il-28U examples) from 1957. Only trainers were retained beyond 1994.[45][46] All grounded during the civil war in the 1990s. Some were displayed during military parades such as the one in 1984.[47]
Aviation Regiment 4020 operated one Il-28 acquired in 1957 attached to 2 Skuadrilja (2nd Squadron). This aircraft was traded for an H-5, the Chinese version of the Soviet Il-28, in 1971 and retired from service in 1992.[48]
Il-28 and Il-28Us locally designated B-228 and CB-228 which operated from 1954 until 1973. 90 Il-28s, 30 Il-28RTs and an unknown number of Il-28Us were delivered.
Received 70 Czechoslovakian-built Il-28s in 1956, shortly before the Suez Crisis. The IDF rated the Il-28 as a high priority target during the Six-Day War.[52]
Received four aircraft (one IL-28 and three Il-28Rs), coded NH-1..4, in the 1960s. The aircraft were used as target tugs and for maritime reconnaissance and patrolling as well as aerial mapping until 1981. The code letters of the type (NH) originated from Neuvostoliittolainen Hinauskone (Soviet towplane) but since they also matched initials of the Soviet leader Nikita Khrushchev (spelled Hruštšov in Finnish), their usual nickname was Nikita.[53]
Received more than 30 Il-28T torpedo-bombers and six Il-28U trainers in 1961. They were based at Surabaya, in what is now Juanda International Airport. The last one was retired in 1972.[54]
Received twelve Il-28s, two Il-28Us and two Il-28BM target tugs starting in January 1959. Some additional aircraft may have been acquired from Egypt in the 1960s.[55] All destroyed or grounded after Desert Storm.
Operated a number of H-5s under the designation B-56. These aircraft served alongside American-built Martin B-57s. The H-5s were not popular with Pakistani pilots, and they were eventually traded back to China in exchange for more Shenyang F-6s.
About 22 Il-28s, three Il-28Rs and eight Il-28Us, both Soviet- and Chinese-built, operated from 1955. All remaining Il-28s were retired from service by June 2001.
About 1,500 served with the Soviet Air Forces and the Soviet Navy (Soviet Naval Aviation), with operations beginning in 1950. Front line operations continued through the 1950s, with a few examples remaining into the 1980s. A small number of demilitarized aircraft were provided to Aeroflot.[45]
Syria operated six Il-28s. Two were destroyed during the Six-Day War. The other four were dumped[60] in airbases around Syria.[61] Replaced in 1980s by Su-24
^Cooper, Tom; Grandolini, Albert (2018). Showdown in Western Sahara, Volume 1: Air Warfare over the Last African Colony, 1945-1975. Warwick, UK: Helion & Company Publishing. pp. 48–49. ISBN978-1-912390-35-9.
^Sipos, Milos; Cooper, Tom (2020). Wings of Iraq, Volume 1: The Iraqi Air Force, 1931-1970. Warwick, UK: Helion & Company Publishing. pp. 48, V. ISBN978-1-913118-74-7.
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