Avro 504

The Avro 504 was a First World War biplane aircraft made by the Avro aircraft company and under licence by others. Production during the war totalled 8,970 and continued for almost 20 years,[1] making it the most-produced aircraft of any kind that served in any military capacity during the First World War. More than 10,000 were built from 1913 until production ended in 1932.[3][4]

Avro 504
Role Trainer, Fighter, Bomber
Manufacturer Avro
First flight 18 September 1913[1]
Introduction 1913
Retired 1934
Primary users Royal Flying Corps
Royal Naval Air Service
Produced 1913–1932
Number built 11,303 including Japanese, Soviet and other foreign production[2]

Design and development
Technical drawing

First flown from Brooklands by Fred "Freddie" Raynham on 18 September 1913,[5] powered by an 80 hp (60 kW) Gnome Lambda seven-cylinder rotary engine, the Avro 504 was a development of the earlier Avro 500, designed for training and private flying. It was a two-bay all-wooden biplane with a square-section fuselage.

Avro 504K from the Shuttleworth Collection

Manufacturers

The following companies are recorded as manufacturing the Avro 504 under licence.[6][7]

Operational history
Foster-mounted Lewis gun on night fighter Avro 504K
"Flight Commander Smith flies for the Peace Loan" Queenslander Pictorial (1919)[8]

Small numbers of early aircraft were purchased by the Royal Flying Corps (RFC) and the Royal Naval Air Service (RNAS) prior to the start of the First World War, and were taken to France when the war started. One of the RFC aircraft was the first British aircraft to be shot down by the Germans, on 22 August 1914. The pilot was 2nd Lt. Vincent Waterfall and his navigator Lt Charles George Gordon Bayly (both of 5 Sqn RFC)[9][10] The RNAS used four 504s to form a special flight in order to bomb the Zeppelin works at Friedrichshafen on the shores of Lake Constance. Three set out from Belfort in north-eastern France on 21 November 1914, carrying four 20 lb (9 kg) bombs each. While one aircraft was shot down, the raid was successful, with several direct hits on the airship sheds and the destruction of the hydrogen generating plant.[11]

Soon obsolete as a frontline aircraft, it came into its own as a trainer, with thousands being built during the war, with the major production types being the 504J and the mass production 504K, designed with modified engine bearers to accommodate a range of engines in order to cope with engine shortages. 8,340 Avro 504s had been produced by the end of 1918.[12]

In the winter of 1917–18 it was decided to use converted 504Js and 504Ks to equip Home Defence squadrons of the RFC, replacing ageing B.E.2cs, which had poor altitude performance. These aircraft were modified as single-seaters, armed with a Lewis gun above the wing on a Foster mounting, and powered by 100 hp (75 kW) Gnome or 110 hp (82 kW) Le Rhône engines. 274 converted Avro 504Js and Ks were issued to eight home defence squadrons in 1918, with 226 still being used as fighters at the end of the First World War.[13]

Following the end of the war, while the type continued in service as the standard trainer of the RAF, large numbers of surplus aircraft were available for sale, both for civil and military use. More than 300 504Ks were placed on the civil register in Britain. Used for training, pleasure flying, banner towing and even barnstorming exhibitions (as was ongoing in North America following World War I with the similar-role, surplus Curtiss JN-4s and Standard J-1s); civil 504s continued flying in large numbers until well into the 1930s.

The embryonic air service of the Soviet Union, formed just after the First World War, used both original Avro 504s and their own Avrushka (" Little Avro") copy of it for primary training as the U-1 in the early 1920s, usually powered by Russian-made copies of the Gnome Monosoupape rotary engine. This Russian version of the 504 was replaced by what would become the most produced biplane in all of aviation history, the Polikarpov Po-2, first known as the U-2; the type remained in Soviet service till the late 1920s, and much later elsewhere.

Although Avro 504s sold to China were training versions, they participated in battles among warlords by acting as bombers with the pilot dropping hand grenades and modified mortar shells .

The improved, redesigned and radial-engined 504N with a new undercarriage was produced by Avro in 1925. After evaluation of two prototypes, one powered by the Bristol Lucifer and the other by the Armstrong-Siddeley Lynx, the Lynx-powered aircraft was selected by the RAF to replace the 504K. 592 were built between 1925 and 1932, equipping the RAF's five flying training schools, while also being used as communication aircraft. The 504N was also exported to the armed forces of Belgium, Brazil, Chile, Denmark, Greece, Siam and South Africa, with licensed production taking place in Denmark, Belgium, Canada, Siam and Japan.

The RAF's 504Ns were finally replaced in 1933 by the Avro Tutor, with small numbers continuing in civilian use until 1940, when seven were impressed into RAF service, where they were used for target- and glider-towing.

The 504 was the first British aeroplane to strafe troops on the ground[14] as well as the first British aircraft to make a bombing raid over Germany.[1][15] It was also the first Allied aeroplane to be downed by enemy anti-aircraft fire and was the first aircraft flown by many future aces, including Billy Bishop.

The 504 is easily recognisable because of the single skid between the wheels, referred to as the "toothpick" in the RAF.

Variants
Early 504 with 80 horsepower Gnome Lambda engine
Original model
  • 504A:
Modified with smaller ailerons and broader struts. 80 hp (60 kW) Gnome engine.
  • 504B
Version for RNAS with larger fin. 80 hp (60 kW) Gnome or Le Rhône engine.
  • 504C
Single-seat anti-zeppelin aircraft for the RNAS. The 504C was fitted with an extra fuel tank, in place of the observer.
  • 504D
Single-seat anti-zeppelin aircraft for the Royal Flying Corps. Six built.
  • 504E
100 hp (75 kW) Gnome Monosoupape engine. Ten built.
  • 504F
75 hp (56 kW) Rolls-Royce Hawk engine. One built.
  • 504G
Two-seat weapons training variant of the Type 504B for the RNAS. The Avro 504G was intended as a bombing/gunnery trainer, with provision for a Scarff ring mounted on the upper longerons, though the final ten delivered had no provision for a gun. Fitted with one 80 hp Gnome powerplant. 50 built and delivered between June 1917 and January 1918. 30 built by Avro and 20 constructed by The Regent Carriage Company.
  • 504H
504C modified for catapult trials. 80 hp (60 kW) Gnome engine.
  • 504J
504A modified to mount a 100 hp (75 kW) Gnome engine.
This Avro 504K was the first aeroplane in Iceland, taken there in 1919
  • 504K
Two-seat training aircraft. The 504K had a universal mount to take different engines. Single-seat fighter (Comic) conversion used for anti-zeppelin work. Several were assembled in Australia by Australian Aircraft & Engineering.[16] 130 hp (97 kW) Clerget 9B, 100 hp (75 kW) Gnome Monosoupape or 110 hp (82 kW) Le Rhône 9J engines.
QANTAS 504K Dyak (c. 1921)
  • 504K Mk.II
Hybrid trainer based on 504K fuselage with 504N undercarriage and wings and powered by rotary engine. Built under licence in Mexico as Avro Anahuac.[17]
  • 504L
Floatplane version. 150 hp (110 kW) Bentley BR1, 130 hp (97 kW) Clerget or 110 hp (82 kW) Le Rhône engines.
504L floatplane (1920)
  • 504M
Three-seat cabin biplane. Only one was ever built. 100 hp (75 kW) Gnome engine.
  • 504N
Two-seat training aircraft. Redesigned postwar trainer for RAF with 160 hp (120 kW) Armstrong Siddeley Lynx engine. 598 built.
504N left side view
  • 504O
Floatplane version of 504N. First aircraft to fly above the Arctic Circle in 1923 Oxford Expedition.
  • 504P
Unbuilt version of the 504N with side-by-side seating.[18]
  • 504Q
Three-seat cabin biplane. The 504Q was built for the Oxford University Arctic Expedition. Only one was ever built, powered by an Armstrong Siddeley Lynx engine.
  • 504R Gosport
Reworked trainer with revised, lightweight structure. Five prototypes flown 1926 to 1927 with various engines (100 hp/75 kW Gnome Monosoupape, 100 hp/75 kW) Avro Alpha, (140 hp/104 kW) Armstrong Siddeley Genet Major and (150 hp/110 kW) Armstrong Siddeley Mongoose), with the Mongoose chosen for production aircraft. Ten were sold to Argentina, with 100 more built by FMA under licence in Argentina. Twelve were exported to Estonia, remaining in service until 1940, and an unknown number to Peru.[19]
504R Gosport
  • 504S
Two-seat training aircraft. Built under licence in Japan by Nakajima.
  • 540
Observer training version of 504K for Japan.
  • 582
Experimental version of 504N, with new wings of RAF 30 aerofoil section, Frise ailerons on the bottom mainplanes, wing struts reduced to a "K" arrangement and a simplified undercarriage. Converted back to 504N standard in 1928 for Bristol Titan engine test bed.
  • 585
504R modified with 504N undercarriage and 90 hp (67 kW) Avro Alpha engine.
  • 598 Warregull
Two-seat trainer based on 504N for Australia, not built.
  • 599 Warregull II
Redesigned version of Type 598, not built.
  • Yokosuka K2Y1
Japanese version of the Avro 504N, given the long designation Yokosuka Navy Type 3 Primary Trainer, powered by a 130 hp (97 kW) Mitsubishi-built Armstrong Siddeley Mongoose radial piston engine, 104 built.
Yokosuka K2Y (1938)
  • Yokosuka K2Y2
Improved version of the K2Y1, powered by a 160 hp (120 kW) Gasuden Jimpu 2 radial piston engine. 360 built (K2Y1 and K2Y2).[20] Watanabe built aircraft were given the long designation Watanabe Navy Type 3-2 Land-based Primary Trainer.
  • U-1 (Uchebnyi – 1) Avrushka
Russian copy of the 504K. Over 700 built.[21][4]
  • MU-1 (Morskoy Uchebnyi – 1)[4]
Russian seaplane version.

Operators
 Argentina
 Australia
 Belgium
  • Belgian Air Force purchased 50 British-built 504Ks from 1920 to 1922, with a further 27 being built under license by SABCA[25] These were replaced by the 504N, 17 being built by Avro in 1929–31,[26] and 31 being built under license.[27]
 Bolivia
 Brazil
 Canada
 Chile
 China
China-Nanjing
 Denmark
 Estonia
 Finland
 Greece
 Guatemala
India British India
 Iran
 Ireland
 Japan
 Latvia
 Federated Malay States
 Mexico
 Mongolia
 Netherlands
 New Zealand
 Norway
 Peru
 Poland
 Portugal
 Russian Empire
 South Africa
 Soviet Union
  • Soviet Air Force – With original British-built examples, and Soviet built U-1 Avrushka copy.
Spain Kingdom of Spain
 Sweden
  Switzerland
 Siam (Thailand)
 Turkey
 United Kingdom
 United States
 Uruguay

Surviving aircraft and replicas
Australia
Qantas Avro 504K replica with Sunbeam engine displayed at Qantas Domestic Terminal
Replica Avro 504K on display at RAAF Museum.
Canada
Finland
New Zealand
  • A202 – 504K airworthy at The Vintage Aviator in Masterton, Wellington. It was purchased by the New Zealand Permanent Air Force in 1925, and subsequently operated as a civilian aircraft.[39][40][41]
Norway
  • Unknown – 504K on static display at the Norwegian Aviation Museum in Bodø, Nordland. It was in service from July 1921 to 1928 and has been on display at the museum since 1995. It is painted with the registration number 103, which belonged to 504A that crashed in 1919.[42]
Russia
United Kingdom
  • BK892 – 504K airworthy at the Shuttleworth Collection in Old Warden, Bedfordshire. It was originally given the serial number H5199, but was converted to a 504N and sold into civilian ownership. However, it was later impressed into RAF service during World War II as a glider tug, at which point it was given a new serial number. Again returned to civilian use after the war, it was used in the filming of Reach for the Sky.[45][46][47]
  • D7560 – 504K on static display at the Science Museum in London.[48]
  • H2311 – 504K on static display at the Museum of Science and Industry in Manchester.[49][50]
  • Composite – 504K on static display at the Royal Air Force Museum London in London. It is made up of the fuselage of G-EBJE and the wings of G-EBKN.[51][52]
  • Replica – 504K on static display at the Brooklands Museum in Weybridge, Surrey.[53] Marked as G-AACA, it was originally built as a taxiable replica for the 1970s BBC TV series 'Wings'; later acquired by the RAF Museum, Hendon and stored at RAF Henlow then loaned to Brooklands Museum c.1987. Later donated to Brooklands Museum, fitted with an original rotary engine and restored to represent one of two 504s used by the Brooklands School of Flying in the late 1920s and early 1930s.
  • Replica – 504J on static display at Solent Sky in Southampton, Hampshire.[54] It is marked as C4451 and was built by ADJ, BAPC No 210.
  • Replica-504K built by Pursang in Argentina in 2010, bought by Eric Vernon-Roe, grandson of Alliot Vernon-Roe, founder of Avro, and then to the UK. Registered as G-EROE, it displays with the Great War Display Team.
United States

Specifications (Avro 504K)
Dimensioned drawing of Russian Avro 504K copy known as Avrushka (Little Avro) U-1/MU-1 (reverse engineered by Sergey Ilyushin c. 1923)

Data from The Encyclopedia of World Aircraft,[61] Jane's Fighting Aircraft of World War I[62]

General characteristics

  • Crew: 2
  • Length: 29 ft 5 in (8.97 m)
  • Wingspan: 36 ft 0 in (10.97 m)
  • Height: 10 ft 5 in (3.18 m)
  • Wing area: 330 sq ft (31 m2)
  • Empty weight: 1,231 lb (558 kg)
  • Gross weight: 1,829 lb (830 kg)
  • Fuel capacity: 25.5 imp gal (31 US gal; 116 L) fuel ; 6 imp gal (7 US gal; 27 L) castor oil
  • Powerplant: 1 × Le Rhône 9J 9-cylinder air-cooled rotary piston engine, 110 hp (82 kW)
  • Propellers: 2-bladed Avro fixed-pitch wooden propeller, 9 ft 0 in (2.74 m) diameter 8 ft 8 in (2.6 m) pitch

Performance

  • Maximum speed: 95 mph (153 km/h, 83 kn) at sea level
87 mph (76 kn; 140 km/h) at 8,000 ft (2,438 m)
85 mph (74 kn; 137 km/h) at 10,000 ft (3,048 m)
  • Cruise speed: 74 mph (119 km/h, 64 kn) at 75% power at 8,000 ft (2,438 m)
71 mph (62 kn; 114 km/h) at 75% power at 10,000 ft (3,048 m)
  • Stall speed: 40 mph (64 km/h, 35 kn)
  • Range: 250 mi (400 km, 220 nmi)
  • Endurance:
  • 2 hours at sea level at maximum speed
  • 2 hours 8 minutes at 8,000 ft (2,438 m) at maximum speed
  • 3 hours at 10,000 ft (3,048 m) at maximum speed
  • 3 hours 42 minutes at 8,000 ft (2,438 m) at cruise speed
  • 4 hours 15 minutes at 10,000 ft (3,048 m) at cruise speed
  • Service ceiling: 16,000 ft (4,900 m)
  • Rate of climb: 700 ft/min (3.6 m/s)
  • Time to altitude:
  • 3,500 ft (1,067 m) in 5 minutes
  • 8,000 ft (2,438 m) in 10 minutes
  • 10,000 ft (3,048 m) in 16 minutes
  • Wing loading: 5.54 lb/sq ft (27.0 kg/m2)
  • Power/mass: 0.06 hp/lb (0.099 kW/kg)

Armament
1 fixed .303 Lewis atop upper wing (single-seat night fighter variants)

Notable appearances in media
Main article: Aircraft in fiction § Avro 504

See also

Related development

Aircraft of comparable role, configuration, and era

Related lists

Footnotes
  1. The 504 is listed in several sources as having been used by the Argentine Air Force. This is because its predecessor, the Army Aviation Service, was established in 1912 and dissolved in 1945 when the Air Force was created.

Notes
  1. Holmes, 2005. p 23.
  2. "Avro 504". britishaviation-ptp.com. Retrieved 23 January 2019.
  3. "Avro 504 (Foreign Derivatives)". britishaviation-ptp.com. Retrieved 23 January 2019.
  4. "Avro 504J & Avro 504K". BAE Systems | International. Retrieved 17 November 2022.
  5. Jackson 1990, p.52.
  6. Flight 1954 p87
  7. Gregorie, Martin C. "The Avro 504K". Martin Gregorie's Home Page. Retrieved 16 July 2021.
  8. "Peace Loan Aeroplane crashes in Gympie (1919) | State Library Of Queensland". www.slq.qld.gov.au. 18 September 2017. Retrieved 17 November 2022.
  9. "Casualty Details:Vincent Waterfall". Commonwealth War Graves Commission. Retrieved 10 January 2010.
  10. Jackson 1990, p.56.
  11. Mason 1994, p.21.
  12. Bruce 16 July 1954, p.87.
  13. Mason 1992, p.127.
  14. Bruce 9 July 1954, p.43.
  15. Lindqvist, Sven (2001). A history of bombing. New York: New Press. ISBN 1-56584-625-7. OCLC 44794868.
  16. Wilson, Stewart (1994). Military Aircraft of Australia. Weston Creek, Australia: Aerospace Publications. p. 216. ISBN 1875671080.
  17. Jackson 1990, p.105.
  18. Jackson 1990, p.127.
  19. Jackson 1990, p. 129-133.
  20. Mikesh and Abe 1990, p. 276.
  21. Jackson 1990, p. 104.
  22. "DANISH AIRCRAFT MANUFACTURE" (PDF). ole-nikolajsen.com. Copenhagen. Archived from the original (PDF) on 15 August 2021. Retrieved 29 December 2018.
  23. Magnusson 2007, p. 155
  24. Ay, Carlos (15 August 2013). "Catálogo Ilustrado de Aeronaves de la Fuerza Aérea Argentina". Gaceta Aeronautica (in Spanish).
  25. Jackson 1990, p.88.
  26. Jackson 1990, p.123.
  27. Jackson 1990, p.124.
  28. Morgała, Andrzej (1997). Samoloty wojskowe w Polsce 1918–1924 [Military aircraft in Poland 1918–1924] (in Polish). Warsaw: Lampart. p. 118. ISBN 83-86776-34-X.
  29. Garlicki, Jarosław (2001). Historia lotnictwa wojskowego Królestwa Tajlandii w latach 1912 – 1945. Część 2. "Militaria i Fakty". 1-2/2001, p. 34-35 (in Polish)
  30. World Air Forces – Historical Listings Thailand (THL), archived from the original on 25 January 2012, retrieved 30 August 2012
  31. "Avro 504K two-seat biplane elementary trainer : A3-4". Australian War Memorial. Retrieved 23 May 2017.
  32. "Qantas Founders Museum Aircraft Collection". Qantas Founders Museum. Retrieved 16 July 2021.
  33. "Avro 504K E3747". RAAF Museum. Retrieved 16 July 2021.
  34. "AVRO 504K (G-CYFG)". Canada Aviation and Space Museum. Canada Science and Technology Museums Corporation. Retrieved 23 May 2017.
  35. Hine, Colin (August 2013). "Canada Aviation and Space Museum Aircraft: Avro 504K RCAF Registrations: G-CYFG & G-CYCK" (PDF). Retrieved 23 May 2017.
  36. "AVRO 504K (G-CYCK)". Canada Aviation and Space Museum. Canada Science and Technology Museums Corporation. Archived from the original on 7 January 2017. Retrieved 23 May 2017.
  37. "KUVIA BREGUET-PROJEKTISTA". Suomen Ilmavoimamuseo (in Finnish). Retrieved 23 May 2017.
  38. "Avro 504K". Ilmailumuseot.fi (in Finnish). Retrieved 23 May 2017.
  39. "Aircraft ZK-ACU Data". Airport-Data.com. Retrieved 16 July 2021.
  40. "Airframe Dossier – Avro 504K, c/r ZK-ACU". Aerial Visuals. Retrieved 16 July 2021.
  41. Prince, Ivan; Cowan, Brendan (6 December 2013). "RNZAF Avro 504K 201 to 206 & RAF Serials". NZDF Serials. Retrieved 16 July 2021.
  42. "Avro 504". Norsk Luftfartsmuseum. Archived from the original on 19 August 2016. Retrieved 23 May 2017.
  43. "WWI – Aircraft". Military Aviation Museum. Military Aviation Museum. Archived from the original on 2 October 2016. Retrieved 23 May 2017.
  44. "FAA REGISTRY [N504K]". Federal Aviation Administration. U.S. Department of Transportation. Retrieved 23 May 2017.
  45. "AVRO 504K". Shuttleworth. Shuttleworth. Retrieved 23 May 2017.
  46. "Airframe Dossier – Avro 504K, s/n BK892 RAF, c/n R3/LE/61400, c/r G-ADEV". Aerial Visuals. AerialVisuals.ca. Retrieved 23 May 2017.
  47. "GINFO Search Results [G-ADEV]". Civil Aviation Authority. Retrieved 23 May 2017.
  48. "Avro 504K biplane D7560 with 130hp Clerget engine, c 1917". Science Museum. Archived from the original on 3 July 2014. Retrieved 23 May 2017.
  49. "Avro 504K Plane". Science Museum. Retrieved 23 May 2017.
  50. "Airframe Dossier – Avro504, s/n H2311 RAF, c/n H2311, c/r G-ABAA". Aerial Visuals. AerialVisuals.ca. Retrieved 23 May 2017.
  51. "Avro 504K". Royal Air Force Museum. Trustees of the Royal Air Force Museum. Retrieved 23 May 2017.
  52. Simpson, Andrew (2014). "INDIVIDUAL HISTORY [E449]" (PDF). Royal Air Force Museum. Royal Air Force Museum. Retrieved 23 May 2017.
  53. "Avro 504K (replica)". Brooklands Museum. Retrieved 16 July 2021.
  54. "Our Exhibits". Solent Sky. Retrieved 16 July 2021.
  55. Von Reuter, Jennifer (22 September 2009). "Company Making Antique Airplanes". NBC29.com. Frankly Media. Archived from the original on 18 August 2018. Retrieved 24 May 2017.
  56. Gaertner, John, "Building The Avro 504... A 25 Year Dream", WW1 Aero
  57. McCullough, Patrick; Haggerty, Tim. "World War I (1914–1918)". Cole Palen's Old Rhinebeck Aerodrome. Rhinebeck Aerodrome Museum. Retrieved 23 May 2017.
  58. "FAA REGISTRY [N4929]". Federal Aviation Administration. U.S. Department of Transportation. Retrieved 23 May 2017.
  59. Air Progress: 20. September 1971. {{cite journal}}: Missing or empty |title= (help)
  60. "Avro 504K". National Museum of the US Air Force. 7 April 2015. Retrieved 23 May 2017.
  61. Donald, David (1997). The encyclopedia of world aircraft (Updated ed.). Ottawa: Prospero Books. p. 77. ISBN 9781856053754.
  62. John W.R. Taylor (1990). "forward". Jane's Fighting Aircraft of World War I. By Whittaker, W. E. De. B. New York, N.Y.: Military Press. pp. 50–51. ISBN 978-0517033760.

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