Vincent Series C Black Shadow
|Vincent Engineers (Stevenage) Ltd.|
|Industry||Manufacturing and engineering|
|Successor||Harper Engineering (Stevenage)|
|Headquarters||Stevenage, Hertfordshire, England|
|Products||Motorcycles, three-wheelers, pumps, amphibious vehicles, drones|
Vincent Motorcycles was a British manufacturer of motorcycles from 1928 to 1955. The business was established by Philip Vincent who bought an existing manufacturing name HRD, initially renaming it as Vincent HRD, producing his own motorcycles as previously with bought-in engines. From 1934, two new engines were developed in 500 cc and 1,000 cc capacities. Production grew from 1936, with the most-famous models being developed from the original designs after the War period in the late 1940s.
The 1948 Vincent Black Shadow was at the time the world's fastest production motorcycle. The name was changed to Vincent Engineers (Stevenage) Ltd. in 1952 after financial losses were experienced releasing capital to produce a Vincent-engined prototype Indian for the US market during 1949. In 1955 the company discontinued motorcycle production after experiencing further heavy financial losses.
- 1 History
- 2 World War II
- 3 Models
- 4 The Last Vincent Motorcycle
- 5 Post motorcycle manufacturing
- 6 Subsequent developments
- 7 See also
- 8 Notes
- 9 References
- 10 External links
Vincent Motorcycles, "the makers of the world's fastest motorcycles", began with the purchase of HRD Motors Ltd less the factory premises, by Philip Vincent in May, 1928.
HRD was founded by the British Royal Flying Corps (RFC) pilot, Howard Raymond Davies, who was shot down and captured by the Germans in 1917. Legend has it that it was while a prisoner of war that he conceived the idea of building his own motorcycle, and contemplated how he might achieve that. It was not until 1924 that Davies entered into partnership with E J Massey, trading as HRD Motors. Various models were produced, generally powered by J.A.P. engines.
Unfortunately, although HRD motorcycles won races, the company ran at a loss. In January 1928 it went into voluntary liquidation. The company was initially bought by Ernest Humphries of OK-Supreme Motors for the factory space, and the HRD name, jigs, tools, patterns, and remaining components were subsequently offered for sale again.
Philip Vincent was advised to start production under an established name. He had built a motorcycle of his own in 1927 and in 1928 had registered a patent for a cantilever rear suspension of his own design. With the backing of his family wealth from cattle ranching in Argentina, Vincent acquired the trademark, goodwill and remaining components of HRD from Humphries for £450 in 1928.
The company was promptly renamed Vincent HRD Co., Ltd and production moved to Stevenage. The new trademark had The Vincent in very small letters above the large "HRD". After World War 2 Britain had an export drive to repay its war debts, and the USA was the largest market for motorcycles, so from 1950 the HRD was dropped from the name to avoid any confusion with the "HD" of Harley Davidson, and the motorcycle became The Vincent.
In 1928 the first Vincent-HRD motorcycle used a JAP single-cylinder engine in a Vincent-designed cantilever frame. The earliest known example extant exists in Canberra, Australia. Some early bikes used Rudge-Python engines. But after a disastrous 1934 Isle of Man TT, with engine problems and all three entries failing to finish, Phil Vincent and Phil Irving decided to build their own engines.
Phil Vincent also experimented with three-wheeled vehicles, amphibious vehicles, and automobiles. In 1932 the first 3-wheeler, "The Vincent Bantam" appeared, powered by a 293cc Villiers engine. It was a 2.5 cwt delivery van with a car seat and a steering wheel. The Bantam cost £57-10-0 and the windscreen and hood option cost £5-10-0. Production ceased in 1936.
In late 1931 Phil Irving first joined Vincent as an engineer alongside fellow-engineer E.J. Massey from the original HRD company after initially working on metallurgy for Velocette, leaving to return to his native Australia in 1949. His first engine design was an OHV 500 cc single-cylinder engine in 1934 called the "Meteor".
World War II
In 1937 Phil Irving went to work for Velocette but returned to Vincent Motorcycles in 1943. Vincent primarily made munitions, but Vincent engines were trialled in boats and portable pumps during the war, and the end of hostilities saw Vincent ready to return to motorcycle production. Vincent developed a highly efficient opposed-piston two-stroke engine for use in air-dropped lifeboats, although development outlasted the war and it never went into service.
Vincent already looked to the United States for sales, and in 1944 Eugene Aucott opened the first USA dealership in the city of Philadelphia. Others followed.
Meteor and Comet
The standard motor was known as the Meteor and the sports motor was the Vincent Comet; it was distinguished from earlier Vincent models of that name by the “Series-A” prefix. There was a TT replica & the Comet Special (basically a TTR with lights, horn etc.), which used a bronze head. The Meteor motor produced 26 bhp (19 kW) @ 5300 rpm,
An unusual feature of the valve design for these motors was the double valve guides, and the attachment of the forked rocker arm to a shoulder between the guides, to eliminate side forces on the valve stem and ensure maximum valve life under racing conditions.
The Series-A Comet could do 90 mph (140 km/h), but Phil Vincent and his racing customers wanted more.
1936 Series A Rapide
Legend has it that Irving accidentally put a side-view tracing of the Vincent 500 motor wrong way up on top of an equally sized drawing of the same view of the same motor, and saw, moving the tracing so the crankshafts and idler gears coincided, that the result looked like a possible design for a V-twin. This resulted in the 47.5° V twin which appeared in 1936. (The single leaned forward 23.75°.)[not in citation given]
The Vincent V-twin motorcycle incorporated a number of new and innovative ideas, some of which were more successful than others.
The Vincent HRD Series A Rapide was introduced in October 1936. Its frame was of brazed lug construction, based on the Comet design but extended to accommodate the longer V twin engine. It continued the use of "cantilever" rear suspension, which was used on all Vincents produced from 1928 until 1955. Other innovations included a side stand.
Innovative telescopic forks were not adopted by Vincent, with both Phils believing girder forks were superior at the time and beyond. The Series-A had external oil lines – known as "the plumber's nightmare" – and a separate gearbox.
With 6.8:1 compression ratio, the 998 cc Series A Rapide Vincent produced 45 hp (34 kW), and was capable of 110 miles per hour (180 km/h). The high power meant that the Burman clutch and gearbox transmission did not cope well.
- Engine: 998 cc, 47.5 degree v-twin ohv four-stroke
- Bore and Stroke: 84 × 90 mm
- Compression Ratio: 6.8:1
- Power: 45 bhp (34 kW) @ 5500 rpm
- Produced: 1936–1939
- Wheelbase: 58.5 inch
- Dry Weight: 430 lb (200 kg)
- Carburettor: 1.0625 inch Amal
- Gearbox: Burman 4 speed, triplex chain primary, wet multiplate clutch
- Frame: Brazed lug duplex tubular cradle. Cantilever rear springing
- Front forks: Brampton girder forks
- Top Speed: 110 mph (180 km/h)
1946 Series B Rapide
The Series B Rapide designed during the war and released to the press before end of hostilities looked radically different from the A: now the oil pipes were internal, and the gearbox was part of the engine casting (Unit Construction). The angle between the cylinders was now 50° instead of the 47.5° of the Series A engine. This allowed the use of the engine as a stressed member of the frame, which consisted of an oil-tank spine with the engine hanging below, and the front and rear suspension attached at the ends. This was considered sensational at the time, and the arrangement was not seen again till the late seventies. The use of the engine-gearbox unit as a stressed member became more usual. Brakes were dual single-leading shoe (SLS), front and rear. The 55.5-inch (1,410 mm) wheelbase was three inches (76 mm) shorter than the Series A, and its dimensions were more like a 500 cc bike of the time.
A more modern hydraulic shock absorber and spring assembly later replaced the old twin springs and friction damper. The rear seat was supported by a sub-frame down to the rear frame pivot point, providing a semi-sprung seat with 6 inches (150 mm) of suspension. (Yamaha would rediscover this suspension system nearly 40 years later.)
The Series B had a Feridax Dunlopillo Dualseat, and a tool tray under the front.
The Series "B" incorporated an inline felt oil filter instead of the metal gauze of the Series "A".
Vincent used quickly detachable wheels, making wheel and tyre changes easier. The rear wheel was reversible, and different size rear sprockets could be fitted for quick final-drive ratio changes. The brake & gear shift were adjustable for reach to suit individual feet. The rear mud guard was hinged to facilitate the removal of the rear wheel.
From today's perspective, it seems incongruous that Vincent could see the need for, and design, a cantilever rear suspension, as well as incorporate so many other new ideas, yet use Brampton girder forks with friction dampers up front. The two Phils felt that the telescopic forks of the time were prone to lateral flex, so they persisted with girder forks, and did use hydraulic damping in the Series C "Girdraulic" forks.
Starting in 1948, Indian Motorcycles distributed Vincents in the United States along with other British motorcycles including AJS, Royal Enfield, Matchless and Norton. That same year an Indian Chief was sent to Stevenage to be fitted with a Vincent Rapide engine. The resulting hybrid Vindian did not go into production.
1948 Series C Vincents
Black Shadow and Black Lightning
The 1948 Series C Rapide differed from the Series B in having "Girdraulic" front forks – which were girder forks with hydraulic damping. By 1950, the Series C featured a 998cc, 50-degree V-twin that put out between 45 and 55 horsepower, depending on the state of tune (Rapide or Black Shadow).
The Black Shadow, capable of 125 mph (201 km/h), and easily recognised by the black coating on the engine and gearbox unit known as Pylumin, and large 150 mph (240 km/h) speedometer, was introduced. The engine produced 54 bhp (40 kW) @ 5700 rpm in Black Shadow trim.
The Black Lightning was a racing version of the Black Shadow; every necessary steel part on it that could be was remade in aluminium, and anything not essential was removed altogether. These changes helped reduce the weight from 458 lb (208 kg) to 380 lb (170 kg). Every bit the racer, it had a single racing seat and rear-set footrests.
The 500 cc Meteor and Comet singles were introduced, along with a 500 cc racer, the Vincent Grey Flash. The Grey Flash racer used Albion gears, for the greater choice of ratios available. The 500 cc bikes used a wet multiplate clutch, while the 998 cc V-twins used a dry, drum-type servo clutch.
Most Vincents were painted black. In 1949 a White Shadow (a machine to Black Shadow mechanical specification, plus additional modification) was available, but only 15 were sold, and the option was dropped in 1952. In 1950 16 Red Comets were shipped to the United States. There were also 31 of the 1948 Grey Flash built.
- Make: Vincent HRD
- Model: 1948 Series C Black Shadow
- Engine: 998 cc (84 × 90 mm bore and stroke) 50° OHV V Twin, 7.3:1 CR, polished conrods
- Carburetor: 2 × 1.125-inch (28.6 mm) type 29 Amals
- Ignition: Lucas magneto (1955 models: coil ignition)
- Electrics: 6v 45w dynamo
- Lubrication: Dry sump, 3 US quarts
- Gearbox: Integral Vincent four speed, triplex chain primary, dry servo – drum clutch
- Final Drive: 530 chain, 46/21 sprockets
- Tyres: 3 × 20 in front, 3.50 × 19 in rear
- Wheels: Front: 1.65 × 20 in. steel rim; Rear: 1.65 × 19 in. steel rim.
- Frame: Spine frame with engine as stressed member
- Rear Suspension: Cantilever rear springing
- Front forks: Vincent Girdraulic forks, 3" travel
- Brakes: Twin drums, 7 in diameter in front and rear, single leading shoe 7/8" wide.
- Weight: 458 lb (208 kg) – 206 kg Wet – 500 lb (227 kg)
- Wheelbase: 55.5 in. (1415 mm)
- Seat height: 32.5 in. (826 mm)
- Performance: 125 mph / 201 km/h – 55 bhp (41 kW) at 5500 rpm
- Fuel Capacity 3.5 gallons / 16 litres
- Manufacturer: The Vincent-HRD Co. Ltd., Great North Road, Stevenage, Herts
1954 "Series D" Vincents
The term "Series D" was not used by the factory, but was taken as a natural progression by the motorcycling world, and indicates a change of the rear subframe with a new seat support, which freed the passenger footpegs from the swingarm-connected-seat struts of the Series B and C models. With sales falling, Vincent tried modernizing his existing line by enclosing the motorcycles in fiberglass bodywork; fairings, engine shrouds, and an enclosed tail section; these were named the Victor (an upgraded Comet), the Black Knight (an upgraded Rapide) and the Black Prince (an upgraded Shadow). They were poorly received by the public, and suffered delays in production, waiting for the new bodywork. A short-lived unfaired version of the Black Prince was then produced, and a Series D Comet.
Rolland "Rollie" Free (November 11, 1900 – October 11, 1984) was a motorcycle racer best known for breaking the American motorcycle land speed record in 1948 on the Bonneville Salt Flats, Utah. The picture of Free, prone and wearing a bathing suit, has been described as the most famous picture in motorcycling  and Russell Wright won another World Land Speed Record at Swannanoa with a Vincent HRD motorcycle in 1955 at 184.83 mph (297.46 km/h).
However, sales declined further after the post-war motorcycling boom owing to the availability of cheaper motor cars, so not many "Series D" models were made.
Fireflys, three wheelers, and NSU
The Firefly was a 45 cc "clip on" engined bicycle built from 1953 to 1955 under licence from Miller, who were suppliers of electrical components to Vincent. It was also known as the Vincent Power Cycle. The Vincent Owners Club was predictably surprised by this new, cheap, entry-level Vincent.
By 1954, Vincent Motorcycles was in an increasingly difficult situation. In the quest for solvency, Vincent looked for ways to improve their position. The trike idea was revived. In 1932 "The Vincent Bantam" was first introduced: Vincent's first 3-wheeler, powered by a 293 cc SV JAP or 250 cc Villiers engine, was a 2.5 cwt delivery van which used a car seat and steering wheel rather than the standard motorcycle saddle and handlebars. The Bantam was priced at £57-10-0 with a windscreen and hood available for an additional £5-10-0. It ceased production in 1936 – the first year of the Series A motorcycle.
In 1954/1955, due to falling sales of motorcycles, the prototype 3-wheeler powered by a Vincent Rapide 998 cc engine was produced. (Some years later,the vehicle was named "Polyphemus" by its owner, Roy Harper.) To keep development and production costs low, it used a parts-bin approach, including pieces from Vincent motorcycles, as well as wheels which came from a Morris Minor. The body was made from 16-gauge aluminium. With the standard Rapide engine, "Polyphemus" could reach 90 mph (140 km/h). Before it was sold, in the hands of Ted Davis, it achieved 117 mph (188 km/h) with a Black Lightning engine. The “Vincent 3-wheeler” was eventually sold to a member of the public for £500 – a high price for any vehicle at the time (the BMC Mini launched four years later for £497), especially for a vehicle with no reverse gear, self-starter or hood.
Unfortunately Vincent motorcycles were hand-built and expensive – only a total of 11,000 machines were sold post–World War Two. A sales slump in 1954 forced the company to import and sell NSU mopeds. One hundred sixty two-stroke Foxes NSU-Vincent 123 cc were built. There were also 40 98cc OHV four-stroke NSU-Vincents, and Vincent also sold the "NSU Quickly" moped; too well it appears (selling about 20,000 in one year – a footnote to how the market had changed again), as NSU took control of its own sales after a year.
The Last Vincent Motorcycle
At a Vincent Owners' Club dinner in the summer of 1955, Phil Vincent announced that the company could no longer continue in the face of heavy losses and that production of motorcycles would cease almost immediately.
In 1955, one week before Christmas, the last Vincent came off the production line and was promptly labelled "The Last".
Post motorcycle manufacturing
Vincent tried for a government contract supplying motors for the ML Aviation U120D target aircraft. The motor had to be capable of passing prolonged full power operation tests. This was called the Picador project. The Vincent motor was upgraded with a better crankshaft, Scintilla magneto, double speed oil pump and fuel injection. They did not get a contract. (Russel Wright's record breaking bike was fitted with a Picador crank and oil pump, by Vincent, while in England for Earls Court, shortly after the 1955 record attempt.)
The company went into receivership in 1959. The name and motorcycle component manufacturing rights were taken over by a local business, Harper Engines Ltd., of Stevenage, Herts., and has since been bought and sold by other engineering firms. In the early 1970s the Vincent Owners Club created via public subscription the VOC Spares Company Ltd to ensure continued availability of spares. The company is independent of the club who retain a majority share holding.[better source needed]
Whereas most were one-off builds, an early attempt at production was announced by Staffordshire engineer Tom Somerton in late 1959, with an intended low-volume run from 1960. It's not known how many were completed.
New Norvins were announced by Hailwood Motorcycle Restorations in 2008, a brand associated with David Hailwood (Mike Hailwood's son) and bike restorer John Mossey. The business soon was dissolved.
The Norvin is now available from John Mossey under a new brand, JMC Classics, together with the Egli-framed Vincent.
Fritz Egli, a specialist frame manufacturer based in Switzerland, produced an Egli-Vincent, and around 100 were produced between 1967 and 1972.[clarification needed] Egli-Vincents were subsequently built under licence in France by Patrick Godet. JMC Classics also produce new Egli framed Vincents in UK.
Vincent RTV Motorcycles
In 1996, a new motorcycle company was formed by three individuals, Rodney Brown (a metallurgical engineer), Terry Prince (a Vincent enthusiast and specialist) and Ron Slender. Brown provided the financial start and along with Prince were the founding directors, with Slender specialising with business development post-production. The company was named RTV Motorcycles. Its ambition was to produce a modern-day classic Vincent motorcycle that could be marketed, in reasonable volumes, worldwide. It used a redesigned and modernised version of the Vincent engine, engineered by Prince, with an increased capacity and in an Egli-style frame. The motorcycles were to be built individually by hand.
The range was to include both a touring and sports model in capacities of 1,000 cc (RTV1000) and 1,200 cc (RTV1200). Complete new engines would also be made available for separate purchase. Production was initially to begin for the larger capacity machine designated the RTV1200. These were to be fitted, as standard, with state of the art; Bosch electric start, Brembo brakes, adjustable Paioli upside down forks, Ohlins rear monoshock and V-2 multiplate clutch. The first factory prototype RTV was built in 1998, other RTV prototypes were in various stages before the company went into voluntary liquidation towards the end of that year.
Vincent Motors USA founder and president, Bernard Li, acquired the Vincent trademark in 1994 and formally launched Vincent Motors USA in 1998, spending about $2 million building prototypes that resemble the original Vincent but utilised modern components like the Honda RC51 V-twin engine. Vincent Motors was based in San Diego.
A resurrection of the Vincent name is now unlikely as the RC51 engine is out of production, and Li was killed in a motorcycle accident in Arizona in 2008.
The Irving Vincent is produced in small numbers by HRD Engineering (Horner Race Development - Ken and Barry Horner) in Hallam, Victoria, Australia. It is a re-engineered version based on the original Phil Irving drawings, with engine capacities of 1000 cc, 1300 cc or 1600 cc.
- Motorcycle Mechanics, August 1961, p69. Advert - Vincent Harper Engines Ltd., Stevenage, Herts. "Successors to Vincent Engineers (Stevenage) Ltd. The only manufacturers of genuine VINCENT spares. Works Service, Repairs, Spares Counter or prompt C.O.D.". Accessed and added 2014-09-18
- Motorcycle Mechanics, September 1964, pp.34-35, 56 Black Shadow - Harper Engineering rebuild, road test by editor Bill Lawless. Accessed and added 2014-09-18
- Classic Bike, September 2002, The Vincent Story - Timeline, by Dave Minton. "Vincent Engineers is bought by the Harper Group and registered as Harper Engines Ltd.". p.31 Accessed and added 2014-09-26
- Motorcycle Sport, July 1979, p.360 P.C.Vincent - A tribute by R.R.H. (Robert 'Bob' Holliday, ex-editor of Motor Cycling) "Much of the efficiency is due to the development work of Ted Davis, then Vincent's Chief Tester". Accessed and added 26 September 2014
- Motorcycle Sport, July 1979, p.349 P.C.Vincent - A tribute by R.R.H. (Robert 'Bob' Holliday, ex-editor of Motor Cycling) "While George Brown was breaking records with his solo Vincents, Ted was dusting up the opposition with his chair outfit using a Lightning engine.". Accessed and added 26 September 2014
- Classic Bike, September 2002, The Vincent Story - Timeline, by Dave Minton. "1947. George Brown, a Vincent tester and racer, builds Gunga Din, the father of all Vincent twin record breakers, and changes the world by forcing the Black Shadow and Black Lightning into life...". p.28 Accessed and added 2014-09-26
- Classic Bike, September 2002, The Vincent Story - Timeline, by Dave Minton, pp.27-31 Accessed and added 2014-09-17
- Ward, Ian. Great British Bikes. Macdonald & Co. ISBN 0-7481-0020-2.
- Vincent Owners' Club The Marque's History Retrieved 2 June 2014
-  3Wheelers Vincent Three Wheelers (Retrieved 22 October 2006)
- Motorcycle Sport, July 1979, p.350 P. C. Vincent - A tribute by R. R. H. (Robert 'Bob' Holliday, ex-editor of Motor Cycling) Accessed and added 26 September 2014
- "Vincent Motors History". Vincent Motors. Vincent Motors, USA. 2004. Archived from the original on 2010-07-02. Retrieved 22 October 2006.
-  NTNOA Histories (Retrieved 22 October 2006)
-  Dropbears Histories (Retrieved 22 October 2006)[not in citation given]
- Wilson, Hugo. (1993) The Ultimate Motor-Cycle Book p.82 Vincent HRD "The pre-war bikes were nicknamed 'the plumber's nightmare' due to their confusion of external oil pipes." Dorling Kindersley ISBN 0751300438 Accessed and added 2014-07-17
-  Ian Chadwick Vincent (Retrieved 22 October 2006)
- Motorcycle Sport, July 1979, p.350 P.C.Vincent - A tribute by R.R.H. (Robert 'Bob' Holliday, ex-editor of Motor Cycling) Accessed and added 2014-06-23
-  TheVincent Models and Fittings (Retrieved 22 October 2006)
- Greg Williams (September–October 2009). "The Last Vincent Black Lightning?". Motorcycle Classics. Retrieved 2010-10-27.
-  Is-it-a-lemon Vincent review (Retrieved 22 October 2006)
- Clement Salvadori (March–April 2007). "Riding the Big Sur on a 1950 Vincent Series C Rapide". Motorcycle Classics. Retrieved 2010-10-27.
- Classic Bike, September 2002, p.73 Accessed and added 2014-09-16
- Vincent Owners Club Retrieved 2014-09-16
-  The Vincent Grey Flash Information (Retrieved 22 October 2006)
- Vincent production figures
- Classic Bike, September 2002, The Vincent Story - Timeline, by Dave Minton. "1949. Vincent drops the HRD logo in case Americans perceive a Harley-Davidson connection.". p.29 Accessed and added 2014-09-26
- "Rollie Free". AMA Motorcycle Hall of Fame Museum. Retrieved 2009-07-10.
-  Globalnet Vincent Firefly (Retrieved 22 October 2006)
- The History of Mini – MiniWorld
-  Vincent Motors History Page3. (Retrieved 22 October 2006) Archived October 17, 2006, at the Wayback Machine.
-  IanChadwick Vincent (Retrieved 22 October 2006)
-  MindSpring 1953 Works Visit (Retrieved 22 October 2006)
-  Flight Global (1953) archive. Power for ultra-light aircraft. "The Vincent engine makes several departures from conventional vee-twin practice." and "This engine has been modified for use in radio-controlled target aircraft, in which form it is known as the Picador." Retrieved 28 November 2013
-  The Vincent Picador Drone (Retrieved 22 October 2006)
- Vincent Spares
- Motorcycle Mechanics, December 1964, pp.34-35, Vin–Nor sprinter. "John Willers of Mitcham started building his Vincent/Norton special several years ago. He aimed to make it a dual–purpose machine that would see off anything else on the road and also acquit itself creditably on the sprint strips". Accessed 2013-12-02
- Motorcycle News, 30 December 1959, front page: British big twin comeback. "...the decision of Staffordshire engineer Tom Somerton to produce a limited number of hand-built 'Lightnings' with considerably modified 998 cc Vincent Black Lightning power units housed in Manx Norton frames..." and "On page six Peter Howdle describes the design in detail and reveals that one of the first production models will shortly be handed to MCN for test". Accessed 2013-12-08
-  The Telegraph, Motoring. Vincent replicas: quality and nostalgia. Riding impressions by the late Kevin Ash Retrieved 2013-12-02
-  Companies in the UK. Hailwood Motorcycle Restorations Ltd. Incorporated March 2008. First strike-off April 2010, Dissolved February 2011. Retrieved 2013-12-02
-  Godet Motorcycles Egli. (Retrieved 22 October 2006)
- Allen, Guy (1998-01-14). "Scoop RTV1200 ride". Australian Motorcycle Trader. pp. 6–7. Retrieved 29 July 2012.
- Brown, Rodney. "History of RTV Motorcycles". The A - Z of motorcycles. Retrieved 29 July 2012.
-  Vincent Motors San Diego (Retrieved 22 October 2006) Archived August 1, 2005, at the Wayback Machine.
- Cycle World Bernard Li, 1946–2008 (Retrieved 2 June 2014)
- Cycleworld September 2008 Retrieved 31 May 2014
- Motorcycle Sport and Leisure July 2011 (Mortons Media) Retrieved 31 May 2014
- Walnecks Classic Cycle Trader June 2008 Retrieved 31 May 2014
- Wheelsmag by Alan Cathcart, March 2012 Retrieved 31 May 2014
- "Vincent HRD Gallery" by Roy Harper. Vincent Publishing Company 1974.
- "The Vincent HRD Story" by Roy Harper. Vincent Publishing Company 1975.
- "P.C.V. The Autobiography of Philip Vincent". Vincent Publishing Company 1976.
- "Vincent: 50 Years of the Marque" by P.C.Vincent. Vincent Publishing Company 1977.
- "Vincent Vee-Twins" by Roy Harper. Osprey Publishing. 1982.
- H.R.D. Motor Cycles. Produced by a Rider Auth: Geoff Preece; Publisher: J. Bickerstaff 1992
- Vincent Motorcycles: The Complete Story, David Wright Pub: Crowood Motoclassics, ISBN 1-86126-516-6, 2002.
- Vincent and HRD Motorcycles – How They Were Promoted and Sold', David Wright, Limited edition of 998 copies 2006.
- "The Snarling Beast" by P. C. Vincent. Vincent Publishing Company 2008. ISBN 978-0-905943-20-6