Handley Page Hendon
|National origin||United Kingdom|
|Developed from||Handley Page Hanley|
The Handley Page Hendon was a British torpedo bomber of the 1920s. A two-seat development of Handley Page's earlier, single-seat Hanley, the Hendon was a single-engine biplane. While six aircraft were purchased by the British Air Ministry for evaluation and trials purposes, no further production ensued, and the Hendon did not enter squadron service.
Development and design
While the single-seat Handley Page Hanley had lost to the similar Blackburn Dart in fulfilling the requirements for a carrier-based torpedo bomber to equip Britain's Fleet Air Arm, it was recognised by both Handley Page and the Air Ministry that a two-seat aircraft would be more useful both for operational purposes and for experimental work. An order was therefore placed on 27 November 1923 for six two-seat derivatives of the Hanley III, designated the Type Ta (later known as the H.P.25) or Handley Page Hendon to meet the requirements of Air Ministry Specification 25/23 for an interim torpedo bomber.
The first of the six aircraft to fly, (serial N9724) flew on 7 July 1924, with the remaining five flying by September. It had a longer fuselage to accommodate the observer, who was provided with a .303 in (7.7 mm) Lewis Gun on a Scarff ring mounting, but initially, was similar to the Hanley III. Tests showed that it was tailheavy when carrying a torpedo, the outer wings being swept back by six degrees to avoid this.
The six Hendons were used for extensive trials to investigate various configurations of leading edge slots/slats. These allowed one aircraft to successfully land on HMS Furious while carrying a torpedo and without using arrestor gear. No further production occurred, the development of automatic slots in October 1927 made the Hendon obsolete.
- Hendon I
- Initial configuration. Leading edge slots as Hanley III. Six built.
- Hendon II
- Improved slot gear. Three converted.
- Hendon III
- Slotted Flaps. One converted from Hendon II.
Data from Handley Page Aircraft since 1907 
- Crew: 2
- Length: 34 ft 6 in (10.51 m)
- Wingspan: 46 ft 0 in (14 m)
- Height: 13 ft 8 in  (4.17 m)
- Wing area: 562 ft² (52.2 m²)
- Empty weight: 4,350 lb  (1,978 kg)
- Loaded weight: 6,970 lb (3,160 kg)
- Powerplant: 1 × Napier Lion IIB 12-cylinder water-cooled W engine, 450 hp (336 kW)
- Maximum speed: 96 kn (110 mph, 177 km/h)
- Stall speed: 48 kn (55 mph, 88 km/h)
- Service ceiling: 9,500 ft (2,900 m)
- Wing loading: 12.4 lb/ft² (60.5 kg/m²)
- Power/mass: 0.065 hp/lb (0.11 kW/kg)
- Guns: 1 × .303 in (7.7 mm) forward firing Vickers machine gun and 1 × .303 in (7.7 mm) Lewis gun in rear cockpit
- Bombs: 1 × 18 in (457 mm) torpedo or 2 × 230 lb (105 kg) bombs
- Related development
- Aircraft of comparable role, configuration and era
- Barnes 1976, p.223, 225.
- Barnes 1976, p.225.
- Mason 1994, p.158.
- Barnes 1976, p.229.
- HANDLEY PAGE H.P.25 HENDON www.handleypage.com. Retrieved 13 June 2008.
- Lewis 1980, p.420-421.
- Barnes, C.H. Handley Page Aircraft since 1907. London:Putnam, 1976. ISBN 0-370-00030-7.
- Mason, Francis K. The British Bomber since 1914. London:Putnam, 1994. ISBN 0-85177-861-5.
- Lewis, Peter. The British Bomber since 1914. London:Putnam, Third edition, 1980. ISBN 0-370-30265-6.
- "The Handley Page “Hendon”". Flight. 29 July 1926. Page 459—461.
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