Martinsyde Semiquaver

Last updated

Semiquaver
Martinsyde Semiquaver.jpg
Role Racing aircraft
National origin United Kingdom
Manufacturer Martinsyde
First flight1920
Number built1

The Martinsyde Semiquaver was a British single-seat racing biplane built by Martinsyde in 1920. It won the 1920 Aerial Derby and was entered for the 1920 Gordon Bennett Trophy, but did not finish the course. In 1921 the fuselage was used as the basis for the Alula Monoplane, an experimental aircraft intended to investigate the performance of a radical wing design by A. A Holle.

Contents

Design and development

The Semiquaver was a single-bay tractor biplane with an upper wing of slightly greater span and chord than the lower. Ailerons were fitted to the top wing only, which was mounted directly on top of the deep rectangular-section fuselage. The pilot sat in an open cockpit behind the upper wing's trailing edge. Construction was of wood, with fabric covering on the wings, tail surfaces and rear part of the fuselage: the front of the fuselage was covered with plywood.

Service history

Painted red and given the civil registration G-EAPX, it was flown by F. P. Raynham to set a new British speed record of 161.434 mph (259.75 km/h) on 21 March 1920 at Martlesham Heath. [1]

Piloted by Frank Courtney, who replaced Raynham as pilot owing to an injury, it won the 1920 Aerial Derby, completing the 200 mi (320 km) course at a speed of 153.45 mph (246.95 km/h). On touching down at the end of the race Courtney hit a bump on the airfield and was thrown back into the air, touched the ground with one wingtip, and turned over. He was unhurt. [2]

It was repaired, with a slight reduction in wingspan, and entered for the 1920 Gordon Bennett Trophy competition, flown by Raynham, who transported the aircraft to France by towing it behind his car. It did not finish the course owing to the failure of the oil pump. [3]

The Alula wing

The Alula Wing was a novel design which resembled a bow, having a straight trailing edge and a curved leading edge coming to a point at the wingtips. It was also unusual in being an unbraced monocoque structure, having no spars, only light spanwise stringers, strength being provided by the wood covering. It was developed by the Dutch engineer A.A. Holle and backed by a company called the Commercial Aeroplane Wing Syndicate, which took over Holle's patents from the Varioplane company, and was associated with Blackburn Aircraft, [4] who carried out the construction and testing work. A test aircraft was built, with the wing mounted high above the fuselage of a D.H.6 re-engined with a 200 hp (150 kW) Bentley BR2 rotary engine. This was first flown in January 1921 by Capt. Clinch. [5]

The characteristics of the wing in wind-tunnel tests carried out at the East London College [6] indicated that it would be of most use for aircraft intended to carry a heavy load at lower speeds (an aircraft capable of carrying four tons, the Pelican Aero-Lorry was planned) [7] but with the intention of demonstrating the wing's capabilities at higher speeds a version of the wing was fitted to the fuselage of the Semiquaver, the wing being mounted on struts above the fuselage.

Called the Alula Monoplane, with a span of 28 ft 6 in and an area of 106.25 sq ft this was entered for the 1921 Aerial Derby with Frank Courtney as pilot, but Courtney was unhappy with its ground handling characteristics, due to the combination of a high centre of gravity and a narrow-track undercarriage, and it was not flown in the competition. [8]

After the original landing gear has been replaced by one having a much wider track it was flown by R. W. Kenworthy at Northolt on 27 August, the takeoff speed being a high 110 mph (180 km/h) [9] [10]

Specifications

Data from [11]

General characteristics

Performance

Related Research Articles

<span class="mw-page-title-main">Blackburn Aircraft</span> Former British aircraft manufacturer

Blackburn Aircraft Limited was a British aircraft manufacturer from 1914 to 1963 that concentrated mainly on naval and maritime aircraft.

<span class="mw-page-title-main">Bristol M.1</span> Type of aircraft

The Bristol M.1 Monoplane Scout was a British monoplane fighter of the First World War. It holds the distinction of being the only British monoplane fighter to reach production during the conflict.

<span class="mw-page-title-main">Avro Baby</span> Type of aircraft

The Avro 534 Baby was a British single-seat light sporting biplane built shortly after the First World War.

<span class="mw-page-title-main">Blériot XII</span> Type of aircraft

The Blériot XII was an early French aeroplane built by Louis Blériot. It was first flown in May 1909 and was the first aircraft to be flown with two passengers on board, and was used by Blériot to gain second place in the 1909 Gordon Bennett Cup and to set a new world speed record.

<span class="mw-page-title-main">Dayton-Wright RB-1 Racer</span> Type of aircraft

The Dayton-Wright RB-1 , also known simply as the Dayton-Wright Racer was a high wing single-engine monoplane racing aircraft developed in the United States to participate in the 1920 Gordon Bennett Cup air race.

<span class="mw-page-title-main">Fokker F.II</span> Type of aircraft

The Fokker F.II was the first of a long series of commercial aircraft from the Fokker Aircraft Company, flying in 1919. In a biplane age, it presented a distinct clean, high-wing monoplane style that sold successfully across Europe and North America during the development of commercial passenger-carrying aviation.

<span class="mw-page-title-main">Goupy No.2</span> Type of aircraft

The Goupy No.2 was an experimental aircraft designed by Ambroise Goupy and Mario Calderara and built in France in 1909 at the Blériot factory at Buc. The Goupy No.2 is significant for two major and influential innovations in aircraft design: it was the first tractor configuration biplane to fly and the first biplane to feature staggered wings, built with a landing gear configuration nearly identical in appearance to the Blériot XI monoplane, flown earlier that year. While both these features would very soon become the norm in aircraft design, the No.2 was described in the aviation press at the time as having a "somewhat unusual design". The only features that would not be typical of aircraft in the years to come would be its biplane tail unit, and the whole-chord wingtip ailerons fitted to both upper and lower wings. The uncovered wood box-girder fuselage, typical of early aircraft, was later covered.

The Bristol Type 32 Bullet was a British biplane racing aircraft. It was designed in 1919 by Frank Barnwell as a high-speed testbed for the Jupiter engine being developed in Bristol by Roy Fedden for the Cosmos Engineering company, and also to publicise the company's name by participating in air races.

<span class="mw-page-title-main">Verville VCP</span> Type of aircraft

The Verville VCP was an American single-engined biplane fighter aircraft of the 1920s. A single example of the VCP-1 was built by the United States Army Air Service's Engineering Division, which was later rebuilt into a successful racing aircraft, while a second, modified fighter was built as the PW-1.

<span class="mw-page-title-main">Westland F.7/30</span> Type of aircraft

The Westland F.7/30 was a British fighter prototype. A single prototype was built in 1934, but the type was not put in production because its performance fell far below the RAF's requirements. The Gloster Gladiator won the F.7/30 competition.

<span class="mw-page-title-main">Boulton Paul Atlantic</span> Type of aircraft

The Boulton & Paul P.8 Atlantic was Boulton & Paul's attempt to adapt their well-performing Bourges bomber into an airliner. They hoped to gain publicity for it by winning the outstanding prize for the first non-stop Atlantic crossing but a first flight accident made them miss their opportunity. Two were built but none sold as airliners.

<span class="mw-page-title-main">Parnall Pixie</span> Type of aircraft

The Parnall Pixie was a low powered British single-seat monoplane light aircraft originally designed to compete in the Lympne, UK trials for motor-gliders in 1923, where it was flown successfully by Norman Macmillan. It had two sets of wings, one for cross-country flights and the other for speed; it later appeared as a biplane which could be converted into a monoplane.

<span class="mw-page-title-main">Handasyde Monoplane</span> Type of aircraft

The Handasyde monoplane was a single-seat light aircraft built for the 1923 Lympne motor glider competition. It competed there but won no prizes.

The Junkers J 15 was an all-metal monoplane built in Germany in 1920 to explore the design parameters of small single-engined passenger transports. In particular, it could fly in either high or low wing configurations. It led to the Junkers J 16 light airliner.

<span class="mw-page-title-main">Bellanca CF</span> Type of aircraft

The Bellanca CF is an early enclosed high-wing monoplane designed by Giuseppe Mario Bellanca that led to a successful series of Bellanca aircraft. Bellanca was nominated for the Collier Trophy in 1922 for the CF design.

The Gaunt biplane no.2 'Baby' was a single-engine, single-seat biplane, designed by John Gaunt and flown by him with some success from Southport sands in Lancashire, England during the summer of 1911.

<span class="mw-page-title-main">Farman Sport</span> Type of aircraft

The Farman FF 65 Sport was a French built light biplane, with a single engine and tandem seats, intended for sport and touring. First flown in 1919, it achieved modest sales at home and abroad in the early 1920s. Two unusual modifications produced a biplane glider and a low aspect ratio parasol wing machine.

<span class="mw-page-title-main">F. P. Raynham</span> British pilot

Frederick Phillips Raynham (1893–1954) was a British pilot from the early days of aviation, gaining his aviator's certificate in 1911. He test-flew Avro, Martinsyde, Sopwith and Hawker aircraft before and after World War I. He later formed the Aircraft Survey Co. and the Indian Air Survey and Transport Co., flying in India and Burma.

<span class="mw-page-title-main">Curtiss Cox Racer</span> Type of aircraft

The Curtiss Model 22 Cox Racers were two specialised racing aircraft built by the American Curtiss Aeroplane and Motor Company. The type was flown as a monoplane, biplane and triplane.

<span class="mw-page-title-main">Caudron Types M and N</span> Type of aircraft

The Caudron Types M and N were small, fast French sports monoplanes, flown 1911–13 under a wide range of engine powers. There was also a military version.

References

  1. "And a Semi-quaver Speed Record" 'Flight' 3 June 1920
  2. The Aerial Derby Flight 29 July 1920
  3. "Gordon Bennett 1920" Flight 7 October 1920
  4. "New Companies Registered" Flight 28 September 1919
  5. Jackson, A..De Havilland Aircraft Since 1915 London: Putnam, 1962, p.58
  6. "A Novelty in Aeroplane Wings" Flight 22 July 1921
  7. "The Alula Wing: A Suggested Application" Flight 5 August 1921
  8. "The Alula Monoplane" Flight 21 July 1921
  9. Jackson, A.J. Blackburn Aircraft since 1909 London: Putnam, 1968, p.9
  10. "The Alula Wing Demonstrated" Flight 2 October 1921
  11. "The Martinsyde Semi-Quaver" Flight 29 July 1929