Hawker Hart

Specifications

1st Flight 1928

Crew: 2

Length: 29 ft 4 in (8.94 m)

Wingspan: 37 ft 3 in (11.35 m)

Height: 10 ft 5 in (3.18 m)

Wing area: 349.5 sq ft (32.47 m2)

Airfoil: RAF 28

Empty weight: 2,530 lb (1,148 kg)

Max takeoff weight: 4,596 lb (2,085 kg)

Fuel capacity: 83 imp gal (100 US gal; 380 L)

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

Performance

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)

Range: 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)

Armament

Guns: 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.

Bombs: Up to 520 lb (240 kg) bombs under wings

Variants

Hart

Hart I

Two-seat light bomber aircraft for the RAF.

525 hp Kestrel IB engine.

Hart SEDB

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 center 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.

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