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| DH.88 Comet | |
|---|---|
| Name | de Havilland DH.88 Comet |
| Caption | DH.88 Comet G‑ACSS "Grosvenor House" |
| Type | Racer / Experimental mailplane |
| Manufacturer | de Havilland |
| First flight | 1934 |
| Primary user | de Havilland |
| Produced | 1934 (four built) |
DH.88 Comet The de Havilland DH.88 Comet was a 1934 British twin‑engine racing aircraft developed by de Havilland to compete in the MacRobertson Air Race from Hendon Aerodrome to Melbourne. Conceived by Sir Geoffrey de Havilland and designed by Arthur Hagg and the de Havilland design team, the type combined advanced aerodynamics, wooden monocoque construction and powerful Gipsy Six engines to achieve long‑range speed records. The four airframes attracted attention from Royal Air Force, commercial operators and private entrants, influencing later designs such as the de Havilland Mosquito and informing policies of Air Ministry procurement.
De Havilland commissioned the Comet to meet the entry requirements set by the organizing committee of the MacRobertson Air Race and to showcase British aeronautical engineering to international audiences including delegations from Australia, United States, France, Germany and Italy. The design team led by Arthur Hagg produced a slim fuselage using plywood stressed-skin techniques pioneered by A. V. Roe and refined by de Havilland in contemporaneous projects like the DH.84 Dragon and DH.86 Express. Its twin de Havilland Gipsy Six engines were mounted on cantilevered low wings derived from experience with the DH.60 Moth family and the company's earlier racers. The Comet incorporated retractable landing gear, flush riveting practice similar to work at Supermarine on the Supermarine S.6B, and enclosed cockpits influenced by long‑distance types such as the Handley Page H.P.42.
Wind tunnel testing at Royal Aircraft Establishment facilities informed wing planform and cooling arrangements; structural methods borrowed from plywood monocoque examples like the Junkers Ju 52 yielded a light but stiff airframe. The prototype underwent flight trials at Hatfield Aerodrome with pilots including Captain Edgar Percival and Charles Scott assisting de Havilland’s test pilots. Certification and race preparation involved interactions with the Air Ministry and oversight from Air Transport Licensing Authority representatives.
The Comet's operational debut was the MacRobertson Air Race in October–November 1934, where entry crews included prominent aviators such as Amy Johnson (observer at related events), Charles Scott and Tom Campbell Black flying one example, and private entrants representing syndicates connected to Grosvenor House Hotel. The leading Comet, flown by Campbell Black and Scott, won the race from Mildenhall/Hendon to Melbourne, stopping at staging posts in Baghdad, Allahabad, Singapore, and Darwin. Other Comets saw varied careers: one was operated by the Royal Australian Air Force for survey and communications, another participated in publicity tours across Europe and South America, while wartime exigencies saw some draw interest from RAF high command though the type was never mass‑adopted.
Post‑race operations included long‑distance mail and demonstration flights connecting hubs like Croydon Airport, Le Bourget, Amsterdam Schiphol Airport, Berlin Tempelhof, and Jerez de la Frontera in promotional circuits. The aircraft intersected with personalities such as Lord Londonderry and Sir Charles Kingsford Smith during exhibitions and diplomatic aviation events, influencing transcontinental route planning by companies including Imperial Airways and later British Overseas Airways Corporation.
At the MacRobertson Air Race the winning Comet established performance benchmarks for piston twin‑engined racers, averaging high cruising speeds between stops and demonstrating exceptional range for its powerplants. Flight logs record one Comet achieving sustained cruise speeds rivaling contemporary types such as the Lockheed Model 10 Electra and the Heinkel He 70. The airframe’s power‑to‑weight ratio and aerodynamic cleanliness allowed record attempts over routes linking England with Australia, and solo ferry flights that attracted aviation chronicle coverage alongside achievements by aviators like Charles Lindbergh and Amy Johnson.
Test data recorded at the Royal Aircraft Establishment showed favorable climb rates and service ceilings for a wooden monocoque racer, and the Comet’s operational reliability inspired technical comparisons with racing contemporaries like the Caudron C.460 and the Bernard 20. Its achievements contributed to evolving performance expectations promulgated by aviation journals and institutions including the Royal Aeronautical Society.
Only four Comet airframes were built, but each underwent modifications reflecting varying operational roles and experimental purposes. Changes included alternative engine installations, auxiliary fuel tank configurations for extended range flights to points such as Kandahar and Singapore, installation of radio navigation equipment following procedures advocated by International Commission for Air Navigation, and airframe repairs after incidents at Auckland, Jodhpur, and Baghdad stops. One machine received structural reinforcement and instrumentation upgrades influenced by wartime research at Hawker and Vickers establishments. Proposed military adaptations were discussed in memoranda circulated among Air Ministry planners but did not proceed beyond prototype trials.
Surviving Comet examples became prized exhibits in aviation museums and private collections. Restorations involved collaboration among institutions such as the Science Museum, London, the National Museum of Flight, Royal Air Force Museum, and Australian custodians including the National Museum of Australia and the Australian National Aviation Museum. Airframes and reproductions appeared at air shows such as Farnborough Airshow and EAA AirVenture Oshkosh while components were conserved under the auspices of trusts connected to families of original owners like the Grosvenor House Hotel syndicate. Preservation efforts referenced archival materials from the Imperial War Museum and technical drawings from the de Havilland company archive, ensuring continued public access and scholarship.
Category:de Havilland aircraft Category:1930s British aircraft Category:Racing aircraft