Hawker Hart

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Hawker Hart
Hawker Hart
Type: Day bomber
Design country:

United KingdomUnited Kingdom United Kingdom


Hawker Aircraft

First flight:


Number of pieces:


The Hawker Hart was a British biplane - fighter aircraft of the 1930s.


The model was based on the specification 26.12 of the British Air Ministry that a bomber in all-metal design foresaw the unprecedented speed of 257 km / h. This performance was achieved by combining the world-class airframe with the Rolls-Royce F.XIB V-12 engine . The prototype with the RAF serial number J9052 and Fl.Lt. PWS Bulman at the wheel first flew in June 1928. Commissioning took place in January 1930 at No. 33rd Squadron of the Royal Air Force in Eastchurch.

Due to its speed, the Hart was temporarily used as a fighter aircraft for No. 23 (Fighter) Squadron. After the experience of this unit with the "Hart Two-Seat Fighter", an improved special combat version should be developed. The result was the Demon , which differs from the Hart mainly with a new version of the Rolls-Royce-Kestrel engine, a modified rear cockpit with a better field of fire, the installation of a radio system and, in some later series machines, a rear wheel instead of the tail spur difference. Hawker built Demon for the RAF 234 and the RAAF 54. In addition, a school version called "Mk II" was created in a series of ten machines with double control and target towing device.

In addition to the standard bomber version, the Hart developed a liaison aircraft variant (Hart Communications), tropicalized variants (Hart (India)) and (Hart (Special)) as well as a school version with double controls. The first aircraft also experimented with folding surfaces for use by the Royal Navy and floats. The series versions were given the name Osprey .

When the Hart was replaced by the Hind in 1936 , a considerable number of the machines were delivered to South Africa. Others went to Estonia (8) and Sweden. Yugoslavia had four Hart on duty in 1931.


The Hawker Hart was built in series by four companies (Hawkers, Kingston; Gloster, Hucclecote; Vickers, Weybridge; Armstrong Whitworth, Whitley Abbey).

Approval of the Hawker Hart by the RAF:

Manufacturer version 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 total
Hawker Mk.I 1   18th 29             48
Vickers Mk.I         52 65         117
AW Mk.I           24 70 57     141
Hawker Special           18th         18th
Gloster Special               40 6th   46
Hawker India       25th 25th   2     5 57
Hawker Communication             1 1     2
Hawker Trainer         1 13 21st 20th     55
AW Trainer               122 181   303
Vickers Trainer             47   114   161
total   1 0 18th 54 78 120 141 240 301 5 948

The Hawker Hart was built in series in Sweden by ASJA, CVM and Götaverken.

Acceptance of the Hawker Hart by the Swedish Air Force:

Manufacturer version 1934 1935 1936 1937 1938 1939 total
Hawker S 7, later B 4 3           3
CVM B 4A     5 3 7th 6th 21st
Götaverken B 4A       3     3
ASJA B 4A       15th 3   18th
total   3 0 5 21st 10 6th 45

Eight Hart aircraft were also delivered to Estonia in 1932 as new aircraft. All other export deliveries are used RAF aircraft. Thus 1,001 Hawker Hart were produced in Great Britain and Sweden.

Hawker Hart in Sweden

Swedish B 4A of the Flygvapenmuseum with Finnish badges

In 1933 the Swedish Air Force ordered a trial delivery of three machines, which arrived in May 1934 and were given the designation S 7. One of the machines was equipped with floats . 9-cylinder radial engines Bristol Pegasus I M2 were installed . License production began and in 1936 the first seven Hart made in Sweden were delivered. In the same year a new order for 35 more aircraft was placed. The machines soon proved to be suitable for use as dive bombers and were therefore given a new designation in 1937, with B 4 for the machines built in Great Britain and B 4A for the machines built in Sweden. The engines, NOHAB Mercury VIIA , were also manufactured under license by NOHAB . Two aircraft were equipped with more powerful Bristol Perseus XI engines and were given the designation B 4B. The last machines were delivered in 1939.

A total of 45 Swedish Hart were produced. 21 was supplied by the Malmen Air Force Factory , 18 by ASJA in Linköping , and three Götaverken in Gothenburg .

Four aircraft were used in the Soviet-Finnish winter war of 1939/40. Three of them were destroyed at the beginning of the fighting, whereupon another machine was dispatched on February 16, 1940. Most of the rest of the machines were decommissioned between 1941 and 1944, but some remained with the troops as tow planes until 1947.

In total, including the licensed versions, more than 1000 Hart with different engines were built.

Technical specifications

Parameter Hard RAF
length 8.94 m
height 3.17 m
span 11.35 m
Wing area 32.33 m²
Empty mass 1148 kg
maximum take-off mass 2066 kg
Engine a Rolls-Royce Kestrel IB piston engine with 239 kW (325 hp) or

a Kestrel X (DR) 12-cylinder V-engine with 380 kW (517 PS)

Top speed 296 km / h at an altitude of 1525 m
maximum range 756 km
Service ceiling 6510 m
Armament a rigid 7.7mm machine gun,

a rear moveable 7.7 mm Lewis MG

Bomb load 236 kg as an external load
crew 1

See also


Web links

Commons : Hawker Hart  - collection of images, videos and audio files

Individual evidence

  1. Halley, James J .: The K File. The Royal Air Force of the 1930s, Tunbridge Wells, 1995, pp. 211 ff .; Halley, James J .: Royal Air Force Aircraft J1-J9999, Tonbridge, 1987, pp. 101, 128
  2. ^ Andersson, Lennart: Svenskt Militärflyg. Propellerepoken, Karlshamn 1992, pp. 208 f., P. 277, p. 293
  3. Wixey, Ken: Hart of the Matter, in: Air Enthusiast 96, pp. 24-33; AE 97, pp. 54-65; AE 98, pp. 57-65
  4. ^ A flight through the ages. Flygvapenmuseum, 2002, ISBN 91-973957-1-4 .