Campbell MacKenzie-Richards was born on 6 January 1900 in Streatham, London, the grandson of Peter Felix Richards (born 1808 in Edinburgh, Scotland; died 14 November 1868 in Shanghai, China), the founder of the Astor House, Shanghai; and the son of Peter Felix Mackenzie-Richards (born about 1863 in Shanghai; died 18 December 1920 in Colchester, Essex), a civil engineer, and Mary Edith "Mollie" MacRae (born 1 July 1869 in Brighton, Sussex; died 7 December 1954 at Heigham Hall, a private mental hospital in Norwich, Norfolk), who had married on 4 September 1893 at St. Leonard's Church, Upper Deal, Kent. MacKenzie-Richards was baptised on 1 March 1900 at the Holy Trinity Church at Upper Tooting. MacKenzie-Richards was the brother of Kenneth (born 1894 in Kensington; died 26 December 1980); Ursula (born 13 November 1902; died 11 December 1995); and Mary (born 1907 in Woodbridge, Suffolk; died 1983). Campbell MacKenzie-Richards was educated at the Woodbridge School in Suffolk.
Around 1923 MacKenzie-Richards joined the Royal Air Force. On 24 January 1924 he was confirmed as Pilot Officer and later was promoted to the rank of Flying Officer, and was attached to the Bombing Squadron based at Martlesham Heath. After earning the reputation of being a highly skilled pilot, MacKenzie-Richards was attached to the experimental staff of the Royal Aircraft Establishment at Farnborough.
As part of the Airship Development Programme, from 9 October 1925 a hook-equipped de Havilland Humming Bird (Registration G-EBQP) was used in a short series of experiments with "an obsolete underpowered type of airship", HMA R33 (Registration G-FAAG) (known colloquially as the "Pulham Pig") in an attempt to develop an airborne aircraft carrier. On 15 October 1925 the Humming Bird flown by Squadron Leader Rollo Haig, was released from the R33, and became the first to reattach an aircraft to a rigid airship, although the propeller was damaged as he reattached and he detached again to glide to a separate landing at the aerodrome. On 4 December 1925 Flight Lieutenant Janor was the first to successfully hook a plane (a Humming Bird) onto a rigid airship (R33) and remain attached until the airship landed. Previously the Royal Air Force had modified two F.1 Sopwith Camels (serials N6622 and N6814) for trials by No. 212 Squadron RAF with airship HMA 23r, which culminated in Lt. R.E. Keys piloting one that was released on 6 November 1918, and the first launch and recovery of an aircraft in mid-air had been performed by the US Army TC-3 blimp on 15 December 1924, with "a Sperry Messenger biplane performing a sortie from and back to a "skyhook" attached to the blimp."
On Thursday 21 October 1926, MacKenzie-Richards and Flying Officer (later Air Vice-Marshal) R.L. Ragg participated in the experimental trials of launching twin parasite aircraft from retractable trapezes attached under the keel of the R33 airship using two Gloster Grebe fighters (J-7400 and J-7385) from Pulham aerodrome. The first Grebe, flown by MacKenzie-Richards, which was positioned aft, was released at 10.17am over Pulham at an altitude of 2,500 feet (762 metres), and, after diving for about 100 ft (30 metres), it leveled out. The Times reported the next day: "The aeroplane, with her engine running, dropped like a stone and then regaining control, MacKenzie-Richards performed a series of stunts, looping-the-loop, rolling and flying upside down", while Flight indicated that the plane "gambolled gaily in the air as if glad to be free, at last, from the maternal apron strings," before landing safely back at Pulham. After some difficulty in starting the engine, the second Grebe piloted by Ragg, which had been positioned abaft of the first Grebe, was successfully released at 11.30am from a slightly higher altitude over Cardington, Bedfordshire, and made a safe landing at Cardington.
In another experiment, the Grebes piloted by MacKenzie-Richards and Ragg were released from 2,000 feet and were able to fly and then reattach their planes to a skyhook on the airship. Despite the successful trials, the technique was never adopted.
MacKenzie-Richards was a member of the Royal Aircraft Establishment (R.A.E.) Aero Club, and competed in air races. In June 1927 MacKenzie-Richards took part in the Whitsun weekend air races (4 and 6 June 1927) at the Ensbury Park racecourse (near Bournemouth), winning from scratch convincingly the delayed first race of the meet on Saturday, 4 June 1927, the Low Power Handicap for airplanes with engines less than 1500cc, against three other competitors (two others had withdrawn) in a de Havilland Humming Bird (Registration G-EBQP), a single-seat ultralight monoplane that had been used in the R33 trials, with a Bristol Cherub III engine. at 73.5 miles per hour. The crash of a de Havilland DH.37A earlier on 4 June 1927, and the collision of a Westland Widgeon and a Blackburn Bluebird on Whit Monday, 6 June 1927, which resulted in the death of two pilots and a passenger in front of thousands of spectators forced the cessation of further air races at Ensbury Park racecourse, and its eventual sale to a housing developer.
During the Nottingham Flying Meeting held at the Hucknall Torkard aerodrome at Hucknall, Nottinghamshire on the Summer Bank Holiday weekend, which included the 6th King's Cup Race, after starting from the scratch position, Mackenzie-Richards came third flying the same de Havilland Humming Bird (Registration G-EBQP) in "ideal flying conditions" over the 8.5 mile single-lap course in the Papplewick Stakes Low-power Handicap, the first event held at 11.30am on Monday, 1 August 1927, and received £10.
On Wednesday 17 August 1927, MacKenzie-Richards married Mirabel Cobbold (born 2 May 1904), who had earned a Bachelor of Arts from the University of Oxford in 1926, the only child of Lt. Col. Ernest Cazenove Cobbold CB (born 15 January 1866 at Ufford, Suffolk; died 1932), of the York and Lancaster Regiment, and Edith Mary White (died 1949), at the St Peter and St Paul’s Parish Church at Aldeburgh, Suffolk.
Death and inquest
MacKenzie-Richards was killed in a night flying accident at East Grinstead on 9 November 1927 at Surrey. MacKenzie-Richards was engaged in testing night navigating devices at Croydon aerodrome, including two new illuminated wind vanes erected there experimentally.
On Wednesday, 9 November 1927, flying a Bristol fighter (registration C810), MacKenzie-Richards had finished his work at 5.30pm and left Croydon with Professor Dr. Harry Norman Green (born 21 September 1902 in Sheffield, England; died 16 May 1967), a pathologist and member of the faculty of medicine (and later the Department of Pharmacology) at the University of Sheffield, as his observer. They attempted to make their way back to Farnborough, but the compass was 30 degrees out when they left. Failing to find Farnborough they attempted to return to Croydon. They flew back without seeing anything they recognised until they estimated they were over Croydon. They could not pick up any indication of Croydon nor could they see any lights. They spoke on the 'telephone' and MacKenzie-Richards suggested that they had better make a forced landing before they ran out of petrol - they only had about 20 minutes fuel remaining. He came down low and asked Green to look for a field. Presently he said that he could not see a field that he could land in and he lit a flare. There was a certain amount of mist, but nothing exceptional. They just missed some trees and climbed back up to 2,000 feet. As Green had never used a parachute before, MacKenzie-Richards briefed him particularly about not pulling the ripcord until he was clear of the aircraft. Green questioned whether the aircraft could be rolled onto its back so that they could both get out, but MacKenzie-Richards refused, saying that Green should go. At the inquest Green explained how he had one foot on the seat and one on the side waiting for the signal to jump. MacKenzie-Richards throttled the engine down and turned around, put his hand out and pushed Green. Green landed in a field and was perfectly alright. MacKenzie-Richards was found in another field, but there was no sign of life; his parachute was open. The Coroner's conclusion was that by the time MacKenzie-Richards left the aircraft he was too close to the ground and that his parachute failed to fully deploy.
At the inquest a Major Cooper informed the Court that the compasses were checked periodically on the ground, and that he was satisfied that this compass had been tested at certain periods. He pointed out that this had been an experimental aircraft, which had certain experimental lights, and the evidence suggested that one of the pieces of wiring had an effect on the compass after the machine had left the ground. It was quite possible that the error in the compass only occurred when the current was generated.
The wreckage of the aircraft was found in a wood about two hundred yards from where his body was found.
MacKenzie-Richards was promoted posthumously to Flight Lieutenant in the Royal Air Force. After his death, his only child, Gillian Campbell MacKenzie-Richards, was born in Aldeburgh, in 1928. For three years, Mirabel and Gillian lived in Aldeburgh. On 1 July 1931, Mirabel married Canadian farmer, Charles Robert Orr-Simpson, of British Columbia. On 14 July 1931 Mirabel and Gillian migrated to Canada on the Empress of Britain. On 26 February 1934, the Simpson family arrived in Southampton on Warwick Castle from Cape Town via Madeira, intending to live in Bath, Somerset. By June 1935, Mirabel was living in Clacton-on-Sea, Essex.
References and notes
- 1901 England Census. Class: RG13; Piece: 475; Folio: 29; Page: 50. Civil parish: Streatham Ecclesiastical parish: Ascension Balham Hill County/Island: London Country: England; Registration district: Wandsworth; Sub-registration district: Streatham; ED, institution, or vessel: 37; Household schedule number: 325; Shearburn Family Tree, http://trees.ancestry.com/tree/780374/person/-778444995.
- 1871 Scotland Census. Parish: Brechin Burgh; ED: 2; Page: 35; Line: 18; Roll CSSCT1871_48; Year: 1871.
- By 1836 it had been opened as a Private Lunatic Asylum. It was probably the last privately owned lunatic asylum in the country. The building was demolished about 1960. See Walter Rye, "HEIGHAM HALL ASYLUM", in History of the Parish of Heigham in the City of Norwich (Norwich: Roberts & Co, 1917), http://www.welbank.net/norwich/hist.html#hhall; "Heigham Hall Private Mental Hospital, Norwich", http://www.nationalarchives.gov.uk/nra/searches/subjectView.asp?ID=O45571; Jonathan Tooke, "Hidden Histories: Discovering Disability in Norwich's Museum Collections: A Research Project for Norfolk Museums & Archaeology Service", http://www.renaissance-east.org.uk/UserData/root/Files/Hidden%20Histories%20Report.pdf
- England & Wales, Death Index: 1916-2005: Death Registration Month/Year: 1920. Age at death (estimated):58; Registration district: Colchester Inferred County: Essex Volume: 4a Page: 731.
- London Metropolitan Archives, Holy Trinity, Upper Tooting, Register of Baptisms, Including Baptisms at Saint Augustine, Tooting, P95/TRI2, Item 004. 1900. Page 6.
- Shearburn Family Tree, http://trees.ancestry.com/tree/780374/person/-778444995
- The London Gazette, 32907 (12 February 1924):10.
- United States Naval Institute, Naval Institute Proceedings, Vol. 52 (1926):2548.
- Naval Institute Proceedings, Vol. 48 (United States Naval Institute, 1922):2136.
- "R33: G-FAAG: 1921-1928: "The Breakaway", http://www.aht.ndirect.co.uk/airships/r33/R33-breakway.html.
- "R.33 as Aircraft Carrier", Flight (22 October 1925):698
- "R.33 as Aircraft Carrier", Flight (28 October 1926):703
- Peter W. Brooks, Zeppelin: Rigid Airships 1893-1940 (Putnam, 1991):189; Richard K. Smith, The Airships Akron & Macon: Flying Aircraft Carriers of the United States Navy (U.S. Naval Institute, 1965):21; Anthony J. Lambert, Travel in the Twenties and Thirties (I. Allan, 1983):35; Ursula Bourne, East Anglian Village and Town Signs, 2nd ed. (Osprey Publishing, 2003):20.
- "'...on the Flying Trapeze': The Experiments with Parasite Airplanes and Airships", http://oldbeacon.com/beacon/airships/parasite.htm; "HMA 23, 24, 25 and 26", http://www.aht.ndirect.co.uk/airships/hma23/index.html; "Flying Forever: R.33 Parasite Fighter Experiments", http://www.unrealaircraft.com/forever/r33_parasite.php
- "Flying Forever - Skyhook", http://www.unrealaircraft.com/forever/skyhook.php; Greg Goebel, "The Parasite Fighters" (1 December 2009), http://www.vectorsite.net/avparsit.html
- The Times (22 October 1926); "R.33 as Aircraft Carrier", Flight (28 October 1926):703-704., http://www.flightglobal.com/pdfarchive/view/1926/1926%20-%200795.html and http://www.flightglobal.com/pdfarchive/view/1926/1926%20-%200796.html; "The Last of HMA R-33", The Aeroplane (24 November 1926):660; Aero Digest 10:1 (Aeronautical Digest Pub. Corp., 1927):59; Aeronautics 7-8 (1942):56; "NICO BRAAS COLLECTION: No. 9322. Gloster Grebe Mk.II (J7400) Royal Air Force" (31 October 2009), http://www.1000aircraftphotos.com/Contributions/Braas/9322.htm; Brett Holman, "The Flying Aircraft Carrier: Why?", (4 July 2008), http://airminded.org/2008/07/04/the-flying-aircraft-carrier-why/
- The Times (22 October 1926).
- "R.33 as Aircraft Carrier", Flight (28 October 1926):706, http://www.flightglobal.com/pdfarchive/view/1926/1926%20-%200798.html
- "R.33 as Aircraft Carrier", Flight (28 October 1926):705, http://www.flightglobal.com/pdfarchive/view/1926/1926%20-%200797.html; Robin D. S. Higham, The British Rigid Airship, 1908-1931: A Study in Weapons Policy (G.T. Foulis, 1961):266; United Service and Royal Aero Club (Great Britain), Flight International, Vol. 81 (IPC Transport Press Ltd., 1962):778; Bernard Fitzsimons, The Illustrated Encyclopedia of 20th Century Weapons and Warfare, Vol. 11 (Columbia House, 1969):1164; Richard K. Smith, The Airships Akron & Macon: Flying Aircraft Carriers of the United States Navy (U.S. Naval Institute, 1965):21; Anthony Robinson, The Illustrated Encyclopedia of Aviation, Vol. 10 (Marshall Cavendish Corp., 1979):85; "NICO BRAAS COLLECTION: No. 9322. Gloster Grebe Mk.II (J7400) Royal Air Force" (31 October 2009), http://www.1000aircraftphotos.com/Contributions/Braas/9322.htm.
- R.33 as Aircraft Carrier", Flight (28 October 1926):706, http://www.flightglobal.com/pdfarchive/view/1926/1926%20-%200798.html; "NICO BRAAS COLLECTION: No. 9322. Gloster Grebe Mk.II (J7400) Royal Air Force" (31 October 2009), http://www.1000aircraftphotos.com/Contributions/Braas/9322.htm;
- Aeronautics 7-8 (1942):56; Peter W. Brooks, Zeppelin: Rigid Airships 1893-1940 (Smithsonian Institution Press, 1992):189; United States Naval Institute, Proceedings, Vol. 61, Part 1 (1935):238; Terence Boughton, The Story of the British Light Aeroplane (J. Murray, 1963):282.
- "Pulham Air Station - RNAS Pulham", Pennoyers Village Centre, http://pennoyers.org.uk/index.php?option=com_content&task=view&id=126&Itemid=1&limit=1&limitstart=1
- "Civil Aircraft Register: Great Britain", http://www.goldenyears.ukf.net/reg_G-E3.htm
- Its Construction Number was 114. See "De Havilland Aircraft Production", http://www.dehavilland.ukf.net/p001.htm. It was delivered to the R.A.E. on 25 March 1925. It was the second machine used in the R33 experiments. It was re-engineered with a Cherub III engine. See Aubrey Joseph Jackson, De Havilland Aircraft Since 1915 (Putnam, 1962):184, 2nd. ed. (1978):219. From 4 April 1927 until 1928 the plane was owned by the RAE Aero Club. It was subsequently owned by Flying Officer AF Scroggs at Henlow. It subsequently crashed at Hamble on 21 July 1934 and was restored by 23 August 1977. Using the original wings and empennage, the fuselage was built by DH Technical Schools. It is now privately owned by Terry Pankhurst and is located at the de Havilland Aircraft Heritage Centre at London Colney, Hertfordshire, England. See "Civil Aircraft Register: Great Britain", http://www.goldenyears.ukf.net/reg_G-E3.htm; Ken Ellis, Wrecks and Relics, 19th ed. (Hinckley, Leicestershire: Midland Publishing, 2004):79-80; Jenna, "Luton Minor Piccies", (17 December 2008), http://forum.keypublishing.com/showthread.php?p=1500945; G-Ordy argues: "Mike Russell chose the identity "G-EBQP" because he believed its C. of A. had expired in 1929 and it would be a likely candidate for parts to go into the Clarke Cheetah. A.J.J. pointed out that G-EBQP was complete at Heston on 29 March 1934 and it was destroyed in a fatal accident at Hamble on 21 July 1934 so there is no way that the aircraft currently registered as G-EBQP has any connection with the genuine article ... although that is not to detract from the fact that it does have the rudder from one of the airship Humming Birds - we just don't know which one!" (26 December 2008), http://forum.keypublishing.com/showthread.php?p=1339370
- There is a report that it was re-engined it with a 26kW ABC Scorpion engine. See "The Bournemouth Whitsun Meeting Organised by the Royal Aero Club", Flight (9 June 1927):368, http://www.flightglobal.com/pdfarchive/view/1927/1927%20-%200406.html; Aubrey Joseph Jackson, De Havilland Aircraft Since 1909, 2nd ed. (Putnam, 1978):512.
- "BOURNEMOUTH Early Airfields - Ensbury Park", http://daveg4otu.tripod.com/airfields/ben.html
- "Air Racing", Flight (9 June 1927):366, http://www.flightglobal.com/pdfarchive/view/1927/1927%20-%200404.html
- "The Bournemouth Whitsun Meeting Organised by the Royal Aero Club", Flight (9 June 1927):368, 374, http://www.flightglobal.com/pdfarchive/view/1927/1927%20-%200406.html; "DORSET CRASH LIST" With additional information from Howard J Curtis and from "Wings over Weymouth" by Colin Pomeroy, updated 1 March 2009, http://daveg4otu.tripod.com/dorset/dorcrash.html; "Wings over Winton", http://www.wintonforum.co.uk/aviation.html#
- For an account and a photo of MacKenzie-Richards and his plane, see "The Nottingham Flying Meeting: Good Races at Hucknall on Monday", Flight (4 August 1927):543, http://www.flightglobal.com/pdfarchive/view/1927/1927%20-%200591.html; "The King's Cup Air Race and August Bank Holiday Meeting", Flight (28 July 1927):510-511; Aubrey Joseph Jackson, British Civil Aircraft, 1919-1972, Vol. 2 (Putnam's British Aircraft Series), 2nd ed. (Putnam, 1998):75; Don Berliner, "A Concise History of Air Racing", Society of Air Race Historians, http://www.airrace.com/ConciseHist.htm
- Mirabel was baptised at St. George's at Hanover Square, London. See Frederick Arthur Crisp, Visitation of England and Wales Vol. 20 (Grove Park Press, 1919):28.
- Charles Harry Clinton Pirie-Gordon, ed., Genealogical and Heraldic History of the Landed Gentry: Founded by the Late Sir Bernard Burke, Vol. 1, 15th ed. (Shaw, 1937):440. One source suggests Mirabel was married previously to Dudley Ropes. See "Family Tree", http://cobboldfht.com/family-tree.php/tree/view/person:496/marriage:314.
- Cobbold was educated at Charterhouse from 1879, enlisted in the York and Lancaster Regiment ion 29 August 1885, served in the Second Boer War and was awarded the Queen's South Africa Medal with three clasps, and made a Companion of the Order of the Bath on 18 February 1915. See Visitation of England and Wales (1919):28; Charterhouse School, Charterhouse Register 1872-1900:143; "Ernest Cazenove Cobbold Grave Monument Details", Grave Monument 353, http://www.gravestonephotos.com/public/gravedetails.php?available=yes&fullname=Ernest%20Cazenove%20Cobbold&grave=353 at St Peter and St Paul’s Parish Church at Aldeburgh, Suffolk.
- She was the daughter of Col. Arthur Wellesley White, and married Cobbold on Thursday, 9 July 1896 at St. George's, Hanover Square, London. See Visitation (1919):28.
- Flight (28 July 1927):530, http://www.flightglobal.com/pdfarchive/view/1927/1927%20-%200578.html; and (1 September 1927):626, http://www.flightglobal.com/pdfarchive/view/1927/1927%20-%200680.html; England & Wales, Marriage Index. Date of Registration: Jul-Aug-Sep 1927 Registration district: Plomesgate Registration county (inferred): Suffolk Volume Number: 4a Page Number: 2837; Charles Harry Clinton Pirie-Gordon, ed., Genealogical and Heraldic History of the Landed Gentry: Founded by the Late Sir Bernard Burke, Vol. 1, 15th ed. (Shaw, 1937):440.
- "A Sacrifice", Flight (17 November 1927):802, http://www.flightglobal.com/pdfarchive/view/1927/1927%20-%200886.html; Great Britain. Parliament. House of Commons, Parliamentary Debates: Official Report, Vol. 210 (H.M. Stationery Off., 1928); United Service and Royal Aero Club (Great Britain), Flight International 81 (IPC Transport Press Ltd., 1962):778; Ces Mowthorpe, Sky Sailors: The Story of the World's Airshipmen (Sutton, 1999):69; Francis K. Mason, The Gloster Gladiator (Issue 98 of Profile Publications) (Macdonald, 1964):13; United States Naval Institute, Naval Institute Proceedings 52 (1926):2548; England & Wales, Death Index (October–December 1927), Registration district: East Grinstead Inferred County: Sussex Volume: 2b Page: 179.
- Green was educated at the Central Secondary School in Sheffield, and received his undergraduate and medical degrees from Sheffield University, specialising in pathology. He taught at the Sheffield University (1926-1933, 1935-1953), Cambridge University (1933-1935), and the University of Leeds (1953-1967). Green's research interests focused on the immune system in cancer induction and growth. In 1947 Green was appointed Director of Cancer. See Georgiana M. Bonser and H.B. Stoner, "Harry Norman Green. 21 September 1902--16 May 1967", J Pathol Bacteriol. 96:1 (July 1968):243-52; James Stuart Olson, ed., The History of Cancer: An Annotated Bibliography (ABC-CLIO, 1989):4; "University of Sheffield", British Medical Journal (29 November 1947):893, http://www.bmj.com/cgi/issue_pdf/admin_pdf/2/4534.pdf
- Harry Norman Green, Papular urticaria (University of Sheffield, Faculty of Medicine, 1927).
- The Times (14 November 1927).
- "Monumental Inscriptions", Seax - Essex Archives Online, http://seax.essexcc.gov.uk/result_details.asp?DocID=513067.
- Great Britain. Parliament. House of Commons, Parliamentary Debates: Official Report, Vol. 210 (H.M. Stationery Off., 1928)
- England & Wales, Birth Index Date of Registration: Jul Aug Sep 1928 Registration District: Plomesgate Registration county: Essex, Suffolk Volume Number: 4a Page Number: 1677; Canadian Passenger Lists, 1865-1935 Date of Arrival: 14 Jul 1931 Vessel: Empress of Britain Port of Arrival: Quebec Port of Departure: Southampton, England Roll: T-14773; "FO Campbell MACKENZIE-RICHARDS RAF (1900–1927)", http://cobboldfht.com/family-tree.php/people/view/497; "Family Tree", http://cobboldfht.com/family-tree.php/tree/view/person:496/marriage:314.
- Burkes, 440. http://cobboldfht.com/family-tree.php/tree/view/person:496/marriage:314.
- Canadian Passenger Lists, 1865-1935 Date of Arrival: 14 Jul 1931 Vessel: Empress of Britain Port of Arrival: Quebec Port of Departure: Southampton, England Roll: T-14773.
- Completed in January 1931 as motor passenger ship for Union-Castle Mail SS Co Ltd, London. See "Warwick Castle", http://www.uboat.net/allies/merchants/ship/2427.html. See postcards: http://www.simplonpc.co.uk/UnionCastle4.html#anchor870622
- UK Incoming Passenger Lists, 1878-1960. Ship Name: Warwick Castle. Arrival Date: 26 Feb 1934 Port of Arrival: Southampton, England. Class: BT26; Piece: 1051; Item: 132. Image 18.
- UK Incoming Passenger Lists, 1878-1960. Ship Name: Llandovery Castle. Arrival Date: 24 Jun 1935 Port of Arrival: Southampton, England. Official Number: 148678. Class: BT26; Piece: 1080; Item: 17.
- Photo of Campbell MacKenzie-Richards in Humming Bird J7326 (G-EBQP)
- Video of HMA R33 launching a Grebe fighter
- Photo of HMA R33 launching a Grebe fighter
- Photo of HMA R33 with two Grebe fighters attached while moored
- HMA R33 with two Grebe fighters attached while moored
- Close-up Photo of HMA R33 with two Grebe fighters attached in flight
- Photo of HMA R33 with two Grebe fighters attached in flight
- British Pathe: 1927 Air races at Ensbury Park racecourse, Bournemouth
- 2009 photo of De Havilland DH.53 Humming Bird, G-EBQP/J7326 flown by MacKenzie-Richards in air races in 1927
- Photo of Humming Bird J7326 (G-EBQP) at the De Havilland Aircraft Heritage Centre
- Photo of Humming Bird J7326 (G-EBQP) at the De Havilland Aircraft Heritage Centre
- Photo of Humming Bird J7326 (G-EBQP) at the De Havilland Aircraft Heritage Centre
- Article: "The Flying Aircraft Carrier: Why?" with photos of R33 and Gloster Grebes
- Short article and photo about the air-launching experiments carried out with the Gloster Grebes