Thread Tools
Sep 21, 2013, 08:29 PM
AMA 986339 FCC KB5LAM/4
davidterrell80's Avatar
Thread OP

Hawker Hart, Demon, Osprey and Hind

The Hawker Hart was a British two-seater biplane light bomber aircraft of the Royal Air Force (RAF). It was designed during the 1920s by Sydney Camm and manufactured by Hawker Aircraft. 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. Several major variants of the Hart were developed, including a navalised version for the Royal Navy's aircraft carriers. Beyond Britain, the Hart would be operated by a number of foreign nations, including Sweden, Yugoslavia, Estonia, South Africa, and Canada.
Last edited by davidterrell80; May 26, 2014 at 11:26 PM.
Sign up now
to remove ads between posts
Feb 14, 2014, 10:28 AM
Registered User
from wikipedia The Hawker Hart
In 1926, the Air Ministry stated a requirement for a two-seat high-performance light day-bomber, to be of all-metal construction and with a maximum speed of 160 mph (258 km/h). Designs were tendered by Hawker, Avro and de Havilland. Fairey, who had sold a squadron's worth of its wooden Fox bomber in 1925, was not at first invited to tender to the specification, and was only sent a copy of the specification after protesting to the Chief of the Air Staff, Hugh Trenchard.

Hawker's design was a single-bay biplane powered by a Rolls-Royce F.XI water-cooled V12 engine (the engine that later became known as the Rolls-Royce Kestrel). It had, as the specification required, a metal structure, with a fuselage structure of steel-tube covered by aluminium panels and fabric, with the wings having steel spars and duralumin ribs, covered in fabric. The crew of two sat in individual tandem cockpits, with the pilot sitting under the wing trailing edge, and operating a single .303 in (7.7 mm) Vickers machine gun mounted on the port side of the cockpit. The observer sat behind the pilot, and was armed with a single Lewis gun on a ring mount, while for bomb-aiming, he lay prone under the pilots seat. Up to 520 pounds (240 kg) of bombs could be carried under the aircraft's wings.

J9052, the prototype Hart, first flew in June 1928, being delivered to the Aeroplane and Armament Experimental Establishment at RAF Martlesham Heath on 8 September. It demonstrated good performance and handling, reaching 176 mph (283 km/h) in level flight and 282 miles per hour (454 km/h) in a vertical dive. The competition culminated in the choice of the Hawker Hart in April 1929.

General characteristics

Crew: 2
Length: 29 ft 4 in (8.94 m)
Wingspan: 37 ft 3 in (11.36 m)
Height: 10 ft 5 in (3.18 m)
Wing area: 349.5 ft (32.5 m)
Airfoil: RAF 28[10]
Empty weight: 2,530 lb (1,150 kg)
Max. takeoff weight: 4,596 lb (2,089 kg)
Powerplant: 1 Rolls-Royce Kestrel IB water-cooled V12 engine, 510 hp (380 kW)


Maximum speed: 161 kn (185 mph, 298 km/h) at 13,000 ft
Stall speed: 39 kn (45 mph, 72 km/h) [41]
Range: 374 nmi (430 mi, 692 km)
Service ceiling: 22,800 ft (6,950 m)
Wing loading: 13.2 lb/ft (64.3 kg/m)
Power/mass: 0.11 hp/lb (0.182 kW/kg)
Climb to 10,000 ft 8 minutes, 30 seconds


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 500 lb (227 kg) bombs under wings.

A number of fighter/bomber/recon/etc a/c were developed frpom the Hart, including the Hawker Demon, Hardy, Hind and Osprey. They are included below.
Last edited by TedD60; Feb 14, 2014 at 01:19 PM.
Feb 14, 2014, 10:29 AM
Registered User
The Hawker Demon was a fighter variant of the Hart light bomber. It was developed as when the Hart entered service, it was virtually uninterceptable by the RAF's fighters, which was demonstrated in air defence exercises where they were sometimes instructed to restrict their height and speed in order to give the RAF's Siskins and Bulldogs a chance.[31] While the Hawker Fury offered better performance, it was expensive and was only available in small numbers, so when a fighter version of the Hart was suggested, the Air Ministry selected the type as an interim fighter until higher performance dedicated fighters could be bought in larger numbers.[32] The new fighter variant added a second Vickers machine gun, while the coaming of the rear cockpit was angled to give a better field of fire, and a supercharged Kestrel IS engine was fitted. Evaluation of an initial batch of six aircraft, known as Hart Fighters by one flight of 23 Squadron during 1931 was successful, and larger orders followed for the fighter Hart, now known as the Hawker Demon.[33] First Flight on February 10, 1933.

305 Hawker Demons were built including 232 for the RAF.[34] The Demon were powered by varying types of the Kestrel engine. It had an armament of a single rear .303 in (7.7 mm) Lewis Gun with two .303 in (7.7 mm) Vickers machine guns in the nose. Large numbers of the type were fitted with a hydraulically powered turret in the rear, which had been tested on the Hawker Hart. The Demon was also sold to the Royal Australian Air Force. It saw only brief second line operations during the Second World War.

Last edited by TedD60; Feb 14, 2014 at 10:39 AM.
Feb 14, 2014, 10:30 AM
Registered User
The Hawker Osprey was the navalised carrier-borne version of the Hart, performing in the fighter and reconnaissance roles. The Osprey had a single Rolls-Royce Kestrel II engine, and had a max speed of 168 mph (270 km/h). Its armament consisted of a single forward .303 in (7.7 mm) Vickers machine gun and one .303 in (7.7 mm) Lewis gun. The Osprey joined the Fleet Air Arm (FAA) in 1932, with 103 being built, and ended its career in 1944 after serving as a trainer for FAA pilots during her career in the Second World War. By December 1936, Ospreys were being deployed by 701 Squadron based at RAF Kalafrana in the anti-submarine and anti-piracy role. The Osprey was also sold to the Swedish Air Force being used on the seaplane cruiser HMS Gotland, which carried six Ospreys. Ospreys were also sold to the air forces of Portugal and the Spanish Republican Air Force.

Stats (Mk IV)
Engine: Rolls-Royce Kestrel II
Horsepower: 630
Max Speed: 176mph (landplane), 169mph (seaplane)
Ceiling: 25,000 (landplane), 22,000 (seaplane)
Endurance: 2 hours 15 minutes
Span: 37ft 0in
Length: 29ft 4in (31ft 9.75in with floats)
Armament: Two 0.303in machine guns, one forward firing and one in aft cockpit.

Last edited by TedD60; Feb 14, 2014 at 10:43 AM.
Feb 14, 2014, 10:34 AM
Registered User
from wikipedia

The British Hawker Hind was a Royal Air Force light bomber of the inter-war years produced by Hawker Aircraft. It was developed from the Hawker Hart day-bomber introduced in 1931.An improved Hawker Hart bomber defined by Specification G.7/34, was purchased by RAF as interim aircraft while more modern monoplane bombers such as the Fairey Battle were still in development. Structural elements were a mixture of steel and duralumin with the wings being fabric covered while the main differences compared to the earlier Hart was a new powerplant, (the Rolls Royce Kestrel V) and the inclusion of refinements from the earlier derivatives such as the cut-down rear cockpit developed for the Demon.

General characteristics

Crew: 2
Length: 29 ft 3 in (8.92 m)
Wingspan: 37 ft 3 in (11.36 m)
Height: 10 ft 7 in (3.23 m)
Wing area: 348 ft (32.3 m)
Empty weight: 3,195 lb (1,452 kg)
Loaded weight: lb (kg)
Useful load: lb (kg)
Max. takeoff weight: 4,657 lb (2,167 kg)
Powerplant: 1 Rolls-Royce Kestrel V Water-cooled V-12, 640 hp (477 kW)


Maximum speed: 161 kn (185 mph, 298 km/h) at 15,500 ft
Stall speed: 39 kn (45 mph, 72 km/h) [3]
Range: 374 nmi (430 mi, 692 km)
Service ceiling: 26,400 ft (8,050 m)
Wing loading: 13.3 lb/ft (37.1 kg/m)
Power/mass: 0.14 hp/lb (0.22 kW/kg)
Climb to 10,000 ft 8 minutes 6 seconds


1 synchronised forward-firing .303 in (7.7 mm) Vickers gun and 1 .303 in (7.7 mm) Lewis gun in rear cockpit
Up to 510 lb (231 kg) bombs under wings.

Last edited by TedD60; Feb 14, 2014 at 11:01 AM.

Quick Reply

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion West Wings Hawker Hart dr_danger Scale Kit/Scratch Built 32 Jul 07, 2013 09:01 PM
Sold SCRATCH BUILDERS....HAWKER HART 1/6 SCALE PLANS 73" Wingspan Plasmajoe Aircraft - Fuel - Airplanes (FS/W) 2 Nov 10, 2011 07:27 PM
Discussion West Wings Hawker Hart easytiger Scale Kit/Scratch Built 132 Nov 08, 2010 06:58 PM
Discussion West Wings Hawker Hart conversion for indoors? ppalma Scratchbuilt Indoor and Micro Models 0 Nov 03, 2007 01:47 PM