Hawker Hart

The Hawker Hart was a British two-seater biplane light bomber aircraft of the Royal Air Force.

It was designed during the 1920s by Sydney Camm.

The Hart was a prominent British aircraft in the inter-war period, but was obsolete and already side-lined for newer monoplane aircraft designs by the start of the Second World War, playing only minor roles in the conflict before being retired.



Hart I

Two-seat light bomber aircraft for the RAF.

525 hp Kestrel IB engine.


Two-seat single-engined light bomber aircraft for the RAF, powered by a 525 hp Rolls-Royce Kestrel IB, or a 510 hp Kestrel X (DR) piston engine.

Hart (India)

Tropicalised version for the RAF, used by RAF in the North West Frontier of India, with larger radiator and extra equipment.

Hart (C)

Two-seat unarmed communications aircraft for the RAF, a small number were used by No. 24 Squadron RAF; eight built.

Hart Trainer (Interim)

Hart light bombers converted into training aircraft.

Two built.

Hart Trainer

Two-seat dual-control trainer aircraft, with reduced sweepback on top wings to compensate for movement in centre of gravity caused by removal of military equipment.

Hart Fighter

Two-seat fighter version for the RAF used by No. 23 Squadron RAF, with Kestrel IIS.

Later redesignated as the Demon; six built.

Hart (Special)

Tropicalised version for the RAF, used by the RAF in the Middle East.

Based on Audax airframe with desert equipment, and de-rated Kestrel X engine.

Hart (Testbeds)

Several Harts were used as engine test beds, including G-ABMR and G-ABTN which were used to test several variants of Kestrel engines.

K2434 was used by Napier to test the Napier Dagger I, II and III.

K3036 was used by Rolls-Royce to test the Merlin C and E, complete with a ventral radiator.

Estonian Hart

Export version for Estonia, equipped with an interchangeable wheel or float undercarriage; eight built.

Swedish Hart

Light bomber for Swedish Air Force.

Four Hawker-built pattern aircraft, powered by a Bristol Pegasus IM2 radial piston engine were delivered in 1934.

Following successful evaluation, 42 were built under licence in Sweden by AB Götaverken of Göteborg, powered by a Swedish-built NOHAB Pegasus IU2.





29 ft 4 in (8.94 m)


37 ft 3 in (11.35 m)


10 ft 5 in (3.18 m)

Wing area

349.5 sq ft (32.47 m2)


RAF 28

Empty weight

2,530 lb (1,148 kg)

Max take-off weight

4,596 lb (2,085 kg)

Fuel capacity

83 imp gal (100 US gal; 380 L)


1 × Rolls-Royce Kestrel IB water-cooled V12 engine, 525 hp (391 kW)


Maximum speed

185 mph (298 km/h, 161 kn) at 13,000 ft (4,000 m)

Stall speed

45 mph (72 km/h, 39 kn)


430 mi (690 km, 370 nmi)

Service ceiling

22,800 ft (6,900 m)

Time to altitude

8 min 30 s to 10,000 ft (3,000 m)



1 × synchronised forward firing .303 in (7.7 mm) Vickers machine gun,

1 × .303 in (7.7 mm) Lewis Gun on Scarff ring in rear cockpit.


Up to 520 lb (240 kg) bombs under wings.



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