Handley Page Hermes

The Handley Page HP.81 Hermes was a civilian airliner designed and produced by the British aircraft manufacturer Handley Page.

The Hermes was developed during the 1940s in parallel with the closely related Handley Page Hastings military transport. It was a low-wing monoplane, with most examples being powered by four piston engines. Originally intended to enter service in advance of the Hastings, development of the Hermes was delayed by the fatal loss of the first prototype during its maiden flight on 2 December 1945. Measures were taken to improve the airliner's stability as well as to expand its capacity, which sufficiently impressed the British Overseas Airways Corporation (BOAC) into placing a sizeable order for 25 ''HP 81 Hermes IV'' on 4 February 1947. A pair of turboprop-powered development aircraft were also ordered by the Ministry of Supply for experimental flights.

The Hermes entered airline service on 6 August 1950, having been delayed be roughly one year due to initial production aircraft being overweight. They would be operated by BOAC, the most prominent operator of the type, for less than a decade before they were sold onto other operators largely due to the rapid advances in airliners made during this era. During its later years of service, second hand Hermes were routinely used by various charter airlines. The final Hermes flight was performed sometimes during 1969, by which point most of the type had already been scrapped as obsolete. A single example has been preserved.

Design and development

Background

The Hermes can be traced back to discussions held by the Air Staff (United Kingdom) as early as summer 1943. At the time, authorities were considering not only the need for an immediate successor to the Royal Air Force's (RAF) fleet of Handley Page Halifax in the transport/freighter capacity, but also the role of an interim civil airliner for the post-war years. Accordingly, during December 1944, priority orders were placed for various projects, including both the military and civil programmes proposed by the British aircraft manufacturer Handley Page. For the civil airliner, Specification 15/43 was issued by the Air Ministry; this called for a pressurised civil transport that was capable of carrying up to 34 first class or 50 tourist class passengers.Barnes 1976, p. 435.

During April 1944, at the urging of George Volkert, Handley Page's chief designer, to settle production priorities, the company's founder and managing director Frederick Handley Page decided to merge the work of several projects and prioritise the transport aircraft; this also aligned with the release of Specification C.3/44, which sought a multipurpose transport.Barnes 1976, pp. 435-436. Handley Page's proposal was accepted with no meaningful alterations sought. Shortly thereafter, it was recognised that development of the civil transport posed less of a challenge than the military transport project, thus it was decided that the airliner programme would be flown first.Barnes 1976, p. 436. The military transport aircraft, which would share a relatively high level of similarities with the civil project, would enter service as the Handley Page Hastings, while the civil transport became known as the Hermes.Jackson 1973, p. 247.

Despite the intentional similarities, there were distinct design differences between the two aircraft. Unlike the tailwheel of the Hastings, the Hermes was planned to have a nosewheel landing gear, although the first two prototypes were completed with a tailwheel undercarriage. Despite the differences, both aircraft remained similar enough that they were produced using the same primary assembly jigs. The first prototype was effectively an unpressurised "bare shell", while the second featured a pressurised cabin and was fully equipped in most respects.Barnes 1976, pp. 436–437. On 9 November 1945, a mock-up conference was held at the company's Cricklewood facility, attended by various airline officials and industry figures. Rapid progress on the first prototype's construction enabled it to commence ground trials at Radlett on 1 December 1945.

Into flight and redesign

While Handley Page had intended for the Hermes to be introduced in advance of the Hastings from an early stage of development, a delay to its production was necessitated after the first prototype (HP 68 Hermes 1), registered ''G-AGSS'', crashed during its maiden flight shortly after takeoff on 2 December 1945.Barnes 1976, p. 437. It is believed that the aircraft had encountered severe longitudinal instability due to elevator overbalance. Handley Page's chief test pilot and the chief test observer were both killed in the incident, while the prototype was completely destroyed by a post-impact fire.

In order to sufficiently resolve the instability that caused the fatal crash, development of the civil Hermes was protracted, while work on the Hastings progressed more smoothly.Barnes 1976, pp. 437–438. This delay presented the opportunity to undertake design revisions and improvements; it was decided that the second prototype's length would be extended to produce the HP 74 Hermes II. The prospects of powering the type with turboprop engines was also investigated around this time, but ultimately decided against.Barnes 1976, p. 460. The first Hermes II (''G-AGUB'') performed its first flight on 2 September 1947; it quickly proved to not only have greater stability, but to also possess a superior lift coefficient to the Hastings as well. On 4 September 1948, the type received its certificate of airworthiness, clearing it for service.Barnes 1976, p. 462.

On 4 February 1947, firm orders were placed by the British Overseas Airways Corporation (BOAC) for 25 of the definitive ''HP 81 Hermes IV''. This model was furnished with a tricycle undercarriage and powered by four Bristol Hercules radial engines, each capable of generating up to 2,100 hp (1,570 kW). Additionally, a pair of ''Hermes V'' airliners were also ordered, the primary difference of this model was the use of four Bristol Theseus turboprop engines instead. Further turboprop-powered developments of the Hermes were also proposed to potential customers as a competitor to types such as the Bristol Britannia.Barnes 1976, pp. 460-461.

Operational history

Airline operations

Despite the first Hermes IV (registered ''G-AKFP'') performing its first flight relatively quickly on 5 September 1948, and quantity production being promptly established, BOAC was somewhat unsatisfied by the airliner, primarily due to the early aircraft being overweight.Barnes 1976, p. 465. This was in part due to the use of Hastings components and ad-hoc modifications to accelerate flight trials; it was promptly agreed that weight-saving modifications were to be made prior to BOAC issuing its final acceptance of the Hermes. Design alterations to reduce weight included the adoption of lighter floor members.Barnes 1976, pp. 465-466.

On 6 August 1950, the Hermes IV finally entered service with BOAC, taking over from the Avro York on the West Africa service from London Heathrow to Accra via Tripoli, Kano and Lagos, with services to Kenya and South Africa commencing before the end of the year.Jackson 1973, pp. 248–249.Barnes 1976, p. 466. The Hermes IV was used by BOAC on routes to West and South Africa. They were quickly replaced, however by the reliable Canadair Argonaut in 1952, although some re-entered service in July 1954 following the grounding of the de Havilland Comet, being retired again in December.Jackson 1973, p. 249.Barnes 1976, p. 471.

This was not the end of the Hermes in airline service, however, as surplus aircraft were sold to independent charter airlines, with Airwork purchasing four in 1952, others being operated by Britavia and Skyways, particularly in the trooping role.Jackson 1973, pp. 249–250. Many of these aircraft were fitted with Hercules 773 engines, which could be operated on lower octane fuel than the original Hercules 763s, being designated as Hermes IVA. They returned to Hermes IV standards when fuel supplies improved.Barnes 1976, pp. 471-472.

Later, the Hermes were flown on inclusive tour holiday flights from the UK. The last operational civil Hermes, ''G-ALDA'', flown by Air Links Limited, was retired on 13 December 1964, and was scrapped nine days later.Jackson 1973, p. 251.Barnes 1976, p. 472.

Development aircraft

The two turboprop Hermes V were owned by the Ministry of Supply and made their first flights in August 1949.Barnes 1976, pp. 464, 466. They were used for development of the Bristol Theseus turboprop engine. The first aircraft was lost in a wheels-up landing at Chilbolton airfield on 10 April 1951, but the second continued development flying with the Aeroplane and Armament Experimental Establishment (A&AEE) at MOD Boscombe Down and the Royal Aircraft Establishment (RAE) at Farnborough Airport until its retirement during September 1953.Barnes 1976, pp. 466-467, 469.

The prototype Hermes II was given military markings in October 1953 as ''VX234'' and was used for various research and development programmes, including the testing of airborne radar for the Royal Radar Establishment at RAF Defford, Worcestershire. It was finally retired in 1969, at which point the aircraft had been the final Hermes in operation.Barnes 1976, pp. 472–474.

Preservation

The fuselage of a Hermes IV (the former BOAC aircraft G-ALDG named ''Horsa'') is preserved at the Imperial War Museum Duxford.

Variants

All 29 aircraft were built at Radlett Aerodrome, Hertfordshire, England.

;HP.68 Hermes I
:Prototype powered by four 1,650 hp (1,230 kW) Bristol Hercules 101 radial engines. One built.
;HP.74 Hermes II
:Prototype powered by four 1,675 hp (1,249 kW) Bristol Hercules 121 engines and a 13 ft (4.57 m) longer forward fuselage. One built.
;HP.81 Hermes IV
:Production aircraft with tricycle landing gear, powered by four 2,100 hp (1,570 kW) Bristol Hercules 763 engines. Twenty-five built.
;HP.81 Hermes IVa
:Hermes IV modified to use 100-octane fuel, with the engine redesignated Hercules 773. Most converted back to Hermes IV standard.
;HP.82 Hermes V
:Development aircraft with four 2,490 hp (1,860 kW) Bristol Theseus 502 turboprops. Two built.

Operators

;
* Bahamas Airways
;
* Kuwait Airways
;
* Middle East Airlines
;
* Air Links
* Air Safaris
* Airwork
* Britavia
* British Overseas Airways Corporation
* Falcon Airways
* Royal Radar Establishment
* Silver City Airways
* Skyways
* Ministry of Supply

Accidents and incidents

* 3 December 1945 - Hermes I ''G-AGSS'' the prototype Hermes crashed on the first test flight soon after takeoff three miles from Radlett Aerodrome. The two Handley Page test pilots were killed.
* 26 May 1952 - Hermes IV ''G-ALDN'' (''Horus''), operated by BOAC, en route from Tripoli, Libya, to Kano, Nigeria, flew off course for several hours and ran out of fuel, force landing in the Sahara Desert south of Atar, Mauritania. The passengers and crew all survived and spent several days in the desert before making their way to an oasis, where First Officer Ted Haslam, who had suffered a head injury in the crash, died.
* 4 March 1956 - Hermes IV ''G-ALDW'' operated by Skyways Limited was destroyed on the ground by a time-bomb in the forward freight compartment. The aircraft was at Nicosia Airport, Cyprus when the explosion occurred 20 minutes before the aircraft was due to depart for the United Kingdom with 68 passengers. There were no fatalities.
* 5 August 1956 - Hermes IV ''G-ALDK'' operated by Britavia suffered the collapse of the nose undercarriage at Drigh Road Airport, Karachi, Pakistan. The aircraft was damaged beyond economic repair.
* 5 November 1956 - Hermes IVa ''G-ALDJ'' operated by Britavia crashed on night approach to Blackbushe Aerodrome, England in bad weather. Seven of the 80 occupants died.ICAO Accident Digest No.8, Circular 54-AN/49 (138–147)
* 1 April 1958 - Hermes IV ''G-ALDV'' operated by Skyways Limited. Crashed at Meesden Green, close to Stansted Airport, whilst on an airtest after an engine change. The crew of three, Capt. Rayment, Capt. West and FE. N Bradley were all killed.
* 9 October 1960 - Hermes IV ''G-ALDC'' of Falcon Airways overran the runway on landing at Southend Airport, ending up across the Shenfield to Southend railway line. The aircraft was written off but all 76 people on board survived.

Specifications (Hermes IV)

See also

References

Citations

Bibliography

* Barnes, C. H. ''Handley Page Aircraft Since 1907''. London: Putnam, 1976. .
* Barnes, C. H. ''Handley Page Aircraft Since 1907''. London: Putnam & Company, Ltd., 1987. .
* Clayton, Donald C. ''Handley Page, an Aircraft Album''. Shepperton, Surrey, UK: Ian Allan Ltd., 1969. .
* Jackson, A.J. ''British Civil Aircraft since 1919: Volume 2''. London:Putnam, Second edition 1973. .

Further reading

*

External links

Hastings at British Aircraft Directory
(archive.org copy)


(archive.org copy)

A picture of the Hermes II prototype ''G-AGUB'' - (note: picture file name is misidentified as an Avro Tudor II)
(archive.org copy)

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1940s British airliners
Hermes
Four-engined tractor aircraft
Low-wing aircraft
Aircraft first flown in 1945
Four-engined piston aircraft