DeHavilland D.H. 88 Comet by SBS

1/72 scale
Kit No. SBS 7003
Cost: $40.00
Decals: Two versions, both for aircraft competing in the 1934 MacRobertson London-to-Melbourne air race
Comments: Resin kit with photo-etch and white metal parts; engraved panel lines; realistically textured control surfaces; film insert for main instrument panel; clear resin parts for one-piece canopy and nose light

History

The DeHavilland DH 88 Comet was a twin-engine, two-seater racing monoplane specifically designed for high speed and endurance, to give it the best possible chance of winning a 1934 intercontinental air race of over 11,000 miles. In late 1933, the idea of a London-to-Melbourne air race was conceived by the Lord Mayor of Melbourne, the second most populous city in Australia. The prize money was posted by Sir Macpherson Robertson, a wealthy Australian confectionery manufacturer, on the conditions that the race be named after his MacRobertson confectionery company, and that it be organised with a view toward maximum safety for the aviators.

Initially no British-built aircraft was capable of presenting a challenge to any other potential entries, for despite spectacular successes such as winning the 1931 Schneider Trophy with the Supermarine S.6B, British aviation had not yet produced an aircraft capable of the enormous overland distances entailed in an air race from England to Australia. In January 1934, the de Havilland company entered the fray when it offered to design a 200 mph (322 km/h) aircraft to compete in the race and produce a limited run if three were ordered by February 1934. The sale price of £5,000 each would by no means cover the development costs, but it was deemed a worthy investment due to the prestige and international acclaim that would surely accompany success.

Orders for three aircraft were received, and de Havilland set to work. The airframe consisted of a wooden skeleton clad with spruce plywood, with fabric covering on the wings. The long streamlined nose held the main fuel tanks, with the low-set and fully glazed tandem two-seat cockpit faired into an unbroken line to the tail. The elongated wings were of a thin cantilever monoplane design for high-speed flight, and as such would require stressed-skin construction to achieve sufficient strength. While other designers were turning to metal to provide this extra strength, de Havilland took the unusual approach of increasing the strength of all-wood construction. De Havilland achieved the skin profile using many thin, shaped pieces set side by side, and then overlaid in the manner of plywood. This was made possible only by the recent discovery of high-strength synthetic bonding resins and its success took many in the industry by surprise.

The engines were uprated versions of the standard Gipsy Six, being tuned for best performance with a higher compression ratio, and fitted with two-position variable pitch propellers. The DH.88 could maintain altitude up to 4,000 ft (1,200 m) on a single engine. The main undercarriage retracted upwards and backwards into the engine nacelles, while the tailskid did not retract. Later examples and rebuilds would feature a castoring tail wheel. Landing flaps were placed slightly forward of the inboard wing trailing edge and continued in to the aircraft centre line. The two large fuel tanks in the forward fuselage were augmented with a third small tank located behind the cockpit. With de Havilland managing to meet the challenging production schedule, testing of the DH.88 began six weeks before the start date of the race.

The race was organised by the Royal Aero Club, and would run from RAF Mildenhall in East Anglia to Flemington Racecourse, Melbourne, approximately 11,300 miles (18,200 km). There were five compulsory stops at Baghdad, Allahabad, Singapore, Darwin and Charleville, Queensland; otherwise the competitors could choose their own routes. A further 22 optional stops were provided with stocks of fuel and oil by Shell and Stanavo. The Royal Aero Club made efforts to persuade the countries along the route to improve the facilities at the stopping points.

The basic rules were: no limit to the size of aircraft or power; no limit to crew size; no pilot was to join any aircraft once it left England; and finally all aircraft were required to carry three days’ rations per crew member, floats, smoke signals and efficient instruments. There were prizes for the outright fastest aircraft, and for the best performance on a handicap formula by any aircraft finishing within 16 days.

The take off date and time were set for October 20, 1934 at 6:30 a.m.. By then, the initial field of over 60 aircraft had been whittled down to 20, including the three purpose-built de Havilland DH.88 Comet racers, two of the new generation of American all-metal passenger transports (the Boeing 247), and a mixture of earlier racers, light transports and old bombers.

First off the line, watched by a crowd of 60,000, were Jim and Amy Mollison in the de Havilland Comet Black Magic, and they were early leaders in the race until forced to retire at Allahabad with engine trouble. This left the scarlet Comet Grosvenor House, flown by Flight Lt. C. W. A. Scott and Captain Tom Campbell Black, well ahead of the field. This racer went on to win immortal fame as the winner of the MacRobertson Air Race, in a time of less than 3 days (70 hours, 54 minutes, 18 seconds), despite flying the last stage with one engine throttled back because of an oil-pressure indicator giving a faulty low reading. It would have won the handicap prize as well, were it not for a race rule that no aircraft could win more than one prize. Lt. Scott and Captain Black won the prize of $75,000 (equal to $1.3 million in 2013) given for the first aircraft to reach Melbourne, Australia from London, England — a distance of 11, 300 miles.

Perhaps more significantly in the development of popular long-distance air travel, the second and third places were taken by new, modern airliners that were already flying regular routes with passengers, with the KLM Douglas DC-2 PH-AJU Uiver (Stork) gaining a narrow advantage over Roscoe Turner’s Boeing 247-D, both completing the course less than a day behind the winner.

The most dramatic part of the race was when the Uiver, hopelessly lost after becoming caught in a thunderstorm, ended up over Albury, New South Wales. The townsfolk responded magnificently – Lyle Ferris, the chief electrical engineer of the post office, went to the power station and signalled “Albury” to the plane by turning the town lights on and off, and Arthur Newnham, the announcer on radio station 2CO Corowa, appealed for cars to line up on the racecourse to light up a runway for the plane. The DC-2 landed, and next morning was pulled out of the mud by locals to fly on and win the handicap section of the race. In gratitude KLM made a large donation to Albury Hospital, and Alf Waugh, the Mayor of Albury, was awarded a title in Dutch nobility. Later that year (1934), the DC-2 crashed near Rutbah Wells, (now known as Ar Rutba, Iraq), and is now commemorated by a flying replica.

In 1935, de Havilland proposed a high-speed bomber version of the DH.88 to the Royal Air Force, but the proposal was rejected. The DH.88 might have faded into history as the only wooden British high-performance monoplane, but for a shortage of metal for aircraft construction tirggered by the outbreak of the Second World War in September 1939. De Havilland would soon put its experience with the DH.88 to use in designing the DH.98 Mosquito, another twin-engined monoplane of wooden construction which, in the pressing urgency of wartime, was suddenly viewed by the RAF in an entirely different light.

With its development now approved from on high, the Mosquito went on to become, in various versions, a highly successful reconnaissance platform, day fighter, night fighter, fighter-bomber, and pathfinder aircraft for heavy bombers. The Mosquito was not simply the 1935 proposal revisited but was a much bigger and more powerful aircraft powered by two Rolls-Royce Merlin engines delivering over twice the power of the Gipsy Sixes. But there is no question that the Mosquito was the direct descendant of the DH.88 Comet.

The Kit

Upon its release in 2015, the SBS De Havilland DH.88 Comet represented a long awaited update to the iconic but ancient Airfix kit of the same record-setting 1930’s racing aircraft. Crisply molded in grey resin, SBS’ DH. 88 is a multi-media kit including white metal parts for its landing gear as well as a small photo-etch fret for cockpit details such as a main instrument panel and seat straps. The kit consists of 44 grey resin parts and two clear resin parts for the one-piece canopy and the DH.88’s signature nose light.

In addition, there are six white metal parts, three for each landing gear, as well as a clear film insert to complement the photo-etch instrument panel. The fuselage features exterior engraved panel detail and internal sidewall detail. The single-piece wings both feature engraved panel lines and flushed rivet detail, as well as subtle stressed fabric-over-frame effects for the control surfaces. Each of the two engine nacelles are beautifully molded as a single piece, with intake and exhaust vent detail to complement the engraved panel lines and flush rivet detail that they share in common with the rest of the airframe.

The curved bucket seats appear to be meticulously scaled, and are so thin that they’re translucent. The cockpit bulkhead, floor, and controls are richly detailed, as are the two spinners with their individually mounted propeller blades. There is a highly detailed wing center section that is to be cemented to the ventral side of the fuselage, with slots to assist the fit when the wings are cemented on. The kit also features a host of small bits that will add to the detail of the finished kit. The tail and elevators are separately mounted, and the latter feature the same stressed fabric-over-frame effect to be found on the wings.

The kit includes four-view illustrations and markings for Grosvenor House, the red aircraft which won the 1934 MacRobertson Air Race, serial no. G-ACSS, and for an unnamed competing DH 88 participating in the same race, painted in racing green (identified by the color plate as Brunswick Green), serial no. G-ACSR.  The brand of the markings is not identified, but it could very well be the same updated sheet which accompanies the original Airfix kits that have been re-issued in recent years — these are high quality, thin markings possessing a flat sheen, which adhere well without silvering, and respond well to decal solvent.

Conclusion

Highly recommended, and a must for De Havilland DH. 88 fans.

References

• www.wikipedia.org
• Monogram De Havilland Mosquito instructions