Handley Page Heyford

Handley Page Heyford
Name	Handley Page Heyford
Caption	A Handley Page Heyford of No. 99 Squadron RAF in flight.
Type	Heavy night bomber
Manufacturer	Handley Page
Designer	George Volkert
First flight	June 1930
Introduced	1933
Retired	1941
Primary user	Royal Air Force
Number built	125

Handley Page Heyford. The Handley Page Heyford was a distinctive British heavy night bomber that served as a mainstay for the Royal Air Force during the interwar period. Its most notable feature was its unusual configuration, with the fuselage suspended from the upper wing and the fixed undercarriage attached to the lower wing. Although obsolescent by the late 1930s, it played a crucial role in the expansion of RAF Bomber Command and saw limited service in the early months of the Second World War.

Development and design

The aircraft was developed to meet Air Ministry Specification B.19/27, which called for a new heavy night bomber to replace the Vickers Virginia. The design team, led by George Volkert at Handley Page, created a large biplane that utilized the company's expertise in building robust, multi-engine aircraft like the earlier Handley Page Hinaidi. A key innovation was the use of a duralumin framework covered with fabric, which saved weight. The unique airframe layout provided a clear field of fire for the nose, dorsal, and ventral gun turret positions, while the deep fuselage allowed internal bomb stowage. Power was supplied by two Rolls-Royce Kestrel liquid-cooled V12 engines, which were mounted on the lower wing.

Operational history

The prototype first flew in June 1930 from Handley Page's airfield at Radlett. Following successful trials, it entered service with No. 99 Squadron RAF at RAF Upper Heyford in late 1933, from which it derived its name. It subsequently equipped fifteen squadrons of RAF Bomber Command, becoming the last biplane bomber to enter frontline service with the Royal Air Force. During the Abyssinia Crisis and the Munich Crisis, Heyford squadrons were deployed on standby, highlighting Britain's defensive posture. By the outbreak of the Second World War, it was largely relegated to training and secondary duties, with the final operational sorties being leaflet-dropping missions over Germany in 1939. The last examples were withdrawn from service in 1941.

Variants

The primary production variants were distinguished by their engine installations and minor improvements. The Heyford I was the initial production model powered by Rolls-Royce Kestrel II engines. The Heyford IA introduced Kestrel III engines and modified exhaust systems. The Heyford II featured Kestrel VI engines with superchargers for better high-altitude performance. The definitive Heyford III, the most numerous variant, incorporated a tailwheel in place of a skid, a redesigned tail gun position, and further refinements to the engine nacelles and fuel systems. A single Heyford was converted into a testbed for the Rolls-Royce Goshawk evaporatively-cooled engine.

Operators

The sole primary military operator was the Royal Air Force. Key units included No. 7 Squadron RAF, No. 9 Squadron RAF, No. 10 Squadron RAF, No. 38 Squadron RAF, No. 78 Squadron RAF, No. 97 Squadron RAF, No. 99 Squadron RAF, No. 102 Squadron RAF, No. 148 Squadron RAF, No. 149 Squadron RAF, No. 166 Squadron RAF, and No. 215 Squadron RAF. In its later years, it served with various RAF Flying Training Command schools and the Aeroplane and Armament Experimental Establishment at RAF Martlesham Heath.

Specifications (Handley Page Heyford III)

* Crew: 4 * Length: 58 ft 0 in (17.68 m) * Wingspan: 75 ft 0 in (22.86 m) * Height: 17 ft 6 in (5.33 m) * Wing area: 1,470 sq ft (136.6 m²) * Empty weight: 9,200 lb (4,173 kg) * Gross weight: 16,900 lb (7,666 kg) * Powerplant: 2 × Rolls-Royce Kestrel III S V12 engines, 525 hp (391 kW) each * Maximum speed: 142 mph (229 km/h, 123 kn) at 13,000 ft (3,962 m) * Range: 920 mi (1,480 km, 800 nmi) * Service ceiling: 21,000 ft (6,400 m) * Armament: ** Guns: 3 × 0.303 in (7.7 mm) Lewis guns in nose, dorsal and ventral positions ** Bombs: Up to 2,500 lb (1,100 kg) of bombs internally

Accidents and incidents

Several aircraft were lost in accidents during its service life, a common hazard for military aviation in the era. In February 1937, a Heyford from No. 102 Squadron RAF crashed near Driffield, Yorkshire, killing all four crew. Another from No. 99 Squadron RAF crashed on takeoff from RAF Mildenhall in September 1937. A training accident occurred in May 1939 when a Heyford collided with a Hawker Hart trainer near RAF Scampton, resulting in fatalities. Its slow speed and dated design made it vulnerable to mishaps, especially in poor weather conditions common over the United Kingdom.

Category:British bomber aircraft 1930–1939 Category:Biplane aircraft Category:Handley Page aircraft