Alex Moulton
born  9th April 1920, Rother Place, Stratford-upon-Avon, Warwickshire, UK
died  9th December 2012, Bath, UK
buried  Christ Church, Bradford-upon-Avon, UK
era  Modern
A biographical summary
Mechanical engineer Dr Alexander Eric 'Alex' Moulton is the man behind the revolutionary small-wheeled lightweight Moulton Bicycle, models of which are still in production, more than 50 years after the initial development work. A specialist in the design of suspension systems, he is responsible for the smooth ride associated with a large range of cars built by the British Motor Corporation (later British Leyland), starting with the ever-popular Mini, first released in 1959.
Moulton is described by architect Norman Foster (b.1935, knighted 1990, Baron Foster of Thames Bank 1999) as a "remarkable man" and "brilliant engineer". His design process linked form and function — inspired by a Japanese tradition that the spirit of the maker is in the artefact — and his ideas that led to prototypes went through a sustained process of testing and improvement. Through his company, Moulton Developments, he developed the innovative Hydrolastic and Hydragas suspension systems. The first of these was in use from 1962 to 1978, and Hydragas from 1980 to 2002.
Moulton's undergraduate studies at King's College, Cambridge, had been interrupted by wartime work on RAF aircraft engines at the Bristol Aeroplane Company, later assisting chief engineer Sir Roy Fedden (1885-1973). Research suited Moulton. He was driven by a desire to understand the fundamentals of a problem before tackling it, trying a solution and then checking the results. He liked to explain and share his conclusions.
The Moulton family's engineering heritage goes back to his great-grandfather Stephen Moulton (1794-1880), an early fabricator in Britain of vulcanised rubber products, working from Bradford-on-Avon. George Spencer Moulton & Co (Spencer Moulton), the company that resulted from a later merger (1891) with a London firm, was a major supplier to railway and vehicle manufacturers for 65 years.
Moulton joined the company in 1945, where he was able to research rubber technologies and find new uses for rubber in place of metal, notably in spring suspension systems. Rubber maintains its volume under load deformation and regains its original shape when unloaded. At the time, its properties in compression were well understood but its behaviour under shear and bending was relatively untested.
In 1948 Moulton invented the Flexitor suspension unit — a torsional shear spring with an inner tubular steel shaft and outer rubber shell, loaded by the relative angular rotation of the two. It's an improvement on the generally-used Torsilastic tubular rubber spring [pioneered by Alvin S. Krotz (1893-1970) in the USA]. Flexitor is easier to attach to a chassis and its shell is a single piece.
In the 1950s, Moulton developed the cone suspension unit that was used in Minis from 1959 until 2000 — a truncated cone (frusto-conical) rubber spring and shock absorber, consisting of a cup-shaped body of rubber bonded between steel plates and attached to a metal arm ending in a ball joint. The ball joint slots into a socket on the wheel strut and, as he noted, "resembles the typical anatomy of a muscle-actuated limb".
Hydrolastic suspension is a refinement of the cone system. It used hydraulic fluid damping and linked a vehicle's wheels into one system, greatly reducing vehicle pitching. Cars manufactured by the British Motor Corporation (later British Leyland) featured Hydrolastic suspension. After 1967, Moulton Developments worked on the Hydragas system, with a pressurised cushion of gas at each wheel and hydraulic fluid interconnection.
In the late 1950s, Moulton started to think about bicycle design, determined to improve ride efficiency and comfort. He interrogated every component of the traditional bike, establishing the essential requirements. The result was the Moulton Bicycle, with its distinctive small diameter wheels, lightweight frame and rubber spring suspension. The Mark 1 prototype (F-Frame) was completed in early 1959, with a revised version ('lazy F') going into production for launch in November 1962. It was an instant success, and by the end of 1963, Moulton had become the second-largest bike frame manufacturer in Britain.
The Moulton bike's high performance and distinctive design have made it popular with cyclists worldwide. Notable models (using the later AM space frame) include the record-breaking AM7 Speed (1983), the AM-ATB (all terrain bike, 1988), and the APB (all purpose bike, 1992). In 1998, the New series was released, using Flexitor suspension on the front wheels and Hydrolastic on the rear. The Moulton Bicycle Company (formed 2008) continues to operate from Bradford-on-Avon. Present-day fans include inventor James Dyson (b.1947, knighted 2007).
Alex Moulton was granted more than 250 patents in his lifetime, 90 percent of them as sole author and 58 percent of them in Britain. His most prolific decades were the 1950s and 60s, covering at least 148 patents. He always devised names for his inventions as he thought that a distinctive word describing their purpose would be memorable.
There was scarcely any boundary between Moulton's life and work. He never married, and he was able to pursue ideas to his own timetable. However, he was keen on outdoor activities: hiking and kayaking into his late eighties, and riding a Moulton bike into his nineties. In 2010, on his 90th birthday, he unveiled the prototype MDev 90 — a new aluminium and carbon fibre-frame bike that can be put together in 20 minutes.
Fiercely intelligent, some would say eccentric and idiosyncratic, he followed through on his convictions. He mourned the decline in British manufacturing, believing in the superiority of moral over financial rewards: "Man should make things — make a profit, of course, but don't take the money gain as the prime judgement".
1920 Born 9th April in Stratford-upon-Avon at his maternal grandmother's house, third child of Major John Coney Moulton OBE (1886-1926, army officer and naturalist/zoologist, curator of Sarawak Museum c1905-15) and Beryl Latimer Greene (1886-1972) with siblings — John G. (b.1916) and Elizabeth Dione (1918-2003)
1928 on Raised by mother and grandmother (father died 1926) at The Hall, Bradford-on-Avon (in Moulton family since 1848), first bike: a Hercules
c.1929-33 Attends Arden House prep school, Henley-in-Arden
1933-38 Boards at Marlborough College, builds a steam car (GN chassis and chain drive, powered by a two cylinder Locomobile engine, boiler heated by a Calor-gas Simpson burner) using own lathe, and is pupil apprentice at Sentinel Waggon Works, Shrewsbury (under Abner Doble [1890-1961])
1938 Reads mechanical engineering at King's College in Cambridge, studies interrupted by World War II, volunteers for service
1939-45 Working (from September) in engine research department at Bristol Aeroplane Company (Filton), initially testing superchargers and carburettors
1940 Promoted (September) to personal assistant to chief engineer Sir Roy Fedden (1885-1973), working in reserved occupation on RAF engines including the 18 cylinder Centaurus
1945 Joins George Spencer Moulton & Co (Moultons owned the factory), assists works manager James 'Jimmy' Chrystal and rubber chemist Dr Samuel Shrowder Pickles (1878-1962)
1946-7 Sets up research department studying rubber technology and rubber-to-metal bonding
1947 Resumes studies at King's College, graduates after four terms
1947 Returns to Spencer Moulton, continues investigating rubber-to-metal bonding, pioneers rubber suspension ideas
1948 Invents Flexitor suspension spring (sleeve of rubber twisted in torsion) for caravan and boat trailers and the Austin Gipsy, installs rubber suspension on aeronautical engineer Ian Duncan's Dragonfly car, British Motor Corporation (BMC) shows interest in Flexitor
1949 Meets Alexander Arnold 'Alec' Issigonis (1906-88, knighted 1969) who is unconvinced about rubber suspension for vehicles ("Rubber is not an engineering material")
c.1949-50 Recruits Philip Wilson Turner (1921-2001, physicist) from University of Cambridge to work on fatigue and creep tests, sets up subsidiary Spencer Moulton Flexitor Ltd, fits rubber rear suspension to motorbikes (Vincent HRD Comet, and Enfield)
1950-51 Two papers with Turner — Influence of Design on Rubber Springs (1950), Development and Testing of a Series of Rubber Suspension Units (1951)
1950s Experiments (early 1950s) with fitting Flexitor to a Leyland Olympic Bus, converts a Thorneycroft craft lorry to use Flexitor
1952 Working with Issigonis on TA350 car suspension at Alvis in Coventry, devising independent suspension with fluid interconnection
1953 Working with William John 'Jack' Daniels (1912-2004) in research department of BMC at Cowley, fits a Morris Minor with rubber suspension (front: Flexitor, rear: Rotashear) and removes the torsion bars, tests car on cobblestone track at Motor Industries Research Association in Nuneaton for 1,600km without failure (compare coil spring suspension: ave 800km)
1955-59 Issigonis returns to BMC as chief engineer and explores using Moulton's rubber suspension on Austin/Morris cars including the Mini (1959)
1956 Spencer Moulton in financial difficulty and sold (1st January) to Avon India Rubber Co Ltd for 6s 6d (32.5p) per share, Moulton appointed technical consultant to Avon
1956 Founds Moulton Developments Ltd
1957-59 Working on the analysis and redesign of bicycles, leading to the creation of the Moulton Bicycle
1959 Launch of the Mini (October) at British International Motor Show in London, featuring Moulton rubber cone spring suspension
1959 First bicycle patent (applied 16th November 1959, granted 27th October 1960)
1960 Licensing agreement (October) with Raleigh but project abandoned (January 1962)
1962 Sets up Moulton Bicycles Limited (April), builds bicycle factory on The Hall estate, commences manufacture in conjunction with BMC (Kirkby, Liverpool)
1962 Perfects the design of Hydrolastic suspension (August)
1962 Moulton Bicycle unveiled (November) at Cycle & Motor Cycle Show in London to great acclaim
1964 Diploma di Medaglia d'Oro (gold medal diploma) in Milan, some Minis fitted with Hydrolastic suspension (and Austin 1800, Maxi and Allegro)
1967 Awarded honorary doctorate by Royal College of Art, and a Queen's Award for Technical Innovation
1967 "Distress sale" (29th July) of Moulton Bicycles Limited to Raleigh, retained as a Raleigh consultant, some bikes produced by Raliegh without front suspension: the frames crack
1967-69 Anthony 'Tony' Best joins Moulton Developments (1967) as chief engineer working on vehicle suspension and leads evolution from Hydrolastic to Hydragas, company moves from iterative testing to computer modelling
1968 Elected to the Faculty of Royal Designers for Industry for his engineering products
c.1970 Designs and builds a lorry with Hydrolastic suspension, and a prototype (not produced) long-distance bus with Hydragas suspension — body by Moulton Developments, chassis of British Leyland truck parts, eight wheels, twin front steering axles, Perkins engine, smooth ride and safe handling
1971 Awarded honorary doctorate by University of Bath
1973 Leads Royal Institution Discourse on results of fundamental research into power required to drive a bicycle, Austin Allegro fitted with Hydragas suspension
1974-75 Raleigh ceases (1974) Moulton Bicycle manufacture and terminates (31st January 1975) consultancy agreement
1975 Incorporates Moulton Developments Limited (18th March), begins designing a tubular space frame bicycle, Moulton Bicycle Club founded, Austin Princess fitted with Hydragas suspension.
1976 Awarded CBE for services to industry
1977 Registers (25th March) The Alex Moulton Charitable Trust
1979 Rides (11th November) the first prototype of the space frame bike in the Peak District, testing continues in secret
1980 Made Fellow of Royal Academy of Engineering
1980 Austin Mini Metro fitted with Hydragas, though the suspension units not connected front-to-rear as intended
1981-3 Master of Faculty of Royal Designers for Industry
1982 Closes Moulton Developments, Austin Ambassador produced until 1984 with Hydragas suspension
1983 Buys back own designs and patents from Raleigh, forms new company Alex Moulton Bicycles in Bradford-on-Avon, launches (19th May) two space frame models (bicycles "for doctors, engineers and perfectionists")
1985-8 Vice President, Royal Academy of Engineering
1987 (silver) Jubilee model space frame produced to mark the 25th anniversary of Moulton bicycles
1988 Offers space frame bike to Raleigh for manufacture (declined), produces first full suspension mountain bike (AM-ATB)
1990 Rover Metro/Rover 100 fitted with interconnected Hydragas suspension
1992 Licences Pashley of Stratford-upon-Avon to make the more affordable space frame all purpose bicycle (APB) in high tensile steel tubing, design derived from the ATB
1994 Awarded honorary doctorate, Cranfield University
1995 MGF roadster launched with Hydragas suspension
1997 Awarded Sir Misha Black Medal for distinguished services in design education (Design & Industries Association, Faculty of Royal Designers for Industry and Royal Academy of Engineering), made Fellow of the Institution of Mechanical Engineers
2000 Licenses Bridgestone in Japan to make an aluminium Moulton bicycle based on the original F-Frame
2002 12 millionth and last new car (an MGF) to be fitted with Hydragas suspension
2005 Institution of Engineering Designers Gerald Frewer Memorial Trophy for contributions to bicycle and vehicle design, highly commended in Prince Philip Design Awards, Moulton bicycle wins New Designers competition for iconic example of British ingenuity
2008 Re-organisation of Alex Moulton Limited
2009 Inaugurates Institution of Engineering Designers Alex Moulton Award for innovative and inspiring designers
2010 Launches (9th April) a "radical redesign" of the Moulton bicycle on his 90th birthday — Prototype MDev 90, a slimline space frame stiffened with carbon fibre, designed for rapid assembly
2012 Hosts a celebration (November) of 50 years of the Moulton Bicycle
2012 Dies (9th December) from a respiratory tract infection
2012 Funeral (19th December) at Bradford-on-Avon, Holy Trinity Church, cortege greeted by a bicycle guard of honour staged by Moulton Bicycle Club members, buried in family grave, most of his £4.2m estate passes to the charitable trust
2015 Moulton Developments Limited dissolved (27th October)
Selected works
Flexitor Suspension System, Bradford-on-Avon, Wiltshire, UK .... 1947
Hydrolastic Suspension System, Bradford-on-Avon, Wiltshire, UK .... 1955-62
Suspension system for the Mini, Bradford-on-Avon, Wiltshire, UK .... 1957-59
Moulton F-Frame Bicycle, Bradford-on-Avon, Wiltshire, UK .... 1957-62
Hydragas Suspension System, Bradford-on-Avon, Wiltshire, UK .... 1967-73
Moulton Space Frame Bicycle, Bradford-on-Avon, Wiltshire, UK .... 1975-83
Moulton New Series Bicycle, Bradford-on-Avon, Wiltshire, UK .... 1998
MDev 90 prototype bicycle, Bradford-on-Avon, Wiltshire, UK .... 2010
All items by Alex Moulton
Everything built ... 1920 - 2012
Sources
Dan Farrell, Dr Alex Moulton CBE — A Man of Conviction, Moulton Bicycle Company, 1 March 2013, www.institution-engineering-designers.org.uk
Dan Farrell, Riding on Rubber: the story of Bradford on Avon's world-renowned rubber industry, Ex Libris Press in association with Bradford on Avon Museum, 2017
Dan Farrell, Obituary — Toby the Cat, Moulton Bicycle Company, 2013
Tony Hadland, The F-Frame Moultons, Lit Verlag, Berlin, 2014 (first published 1981)
Tony Hadland, The Spaceframe Moultons, Lit Verlag, Berlin, 2009 (first published 1994)
A.E. Moulton, Rubber suspension systems, Chapter 4, Steering, Suspension and Tyres, edited Dr John George Giles, Iliffe Books Ltd, London, 19th July 1968
Alex Moulton, A Lifetime in Engineering: An Interview with Alex Moulton and John Pinkerton, Lit Verlag, Berlin, 2007 (interview conducted 24th October 1998)
Dr Alex Moulton, Innovation, Journal of the Royal Society of Arts, Vol.128, No.5281, pp.31-44, December 1979
Andrew Nahum, Moulton, Alexander Eric [Alex] (19202012), Oxford Dictionary of National Biography, Oxford University Press, Jan 2016
Open University, T100 module, Man-Made World: a Foundation Course in Technology, (20 min long video plus transcript), made 1971, first transmitted 12th March 1972
Our thanks go to Dan Farrell and Aynsley Brown for their generous help
Obituaries
Architects Journal, 11th December 2012, www.architectsjournal.co.uk
AROnline, Alexander Boucke, 10th December 2012, www.aronline.co.uk
Balloon-Fish, 10th December 2012, www.balloon-fish.co.uk
Bike Radar, Jeff Jones, 10th December 2012, www.bikeradar.com
Bikebiz, Carlton Reid, 10th December 2012, www.bikebiz.com
Libby Broadhurst & Colin Ledsome, Institution of Engineering Designers obituary, 1st January 2013, www.institution-engineering-designers.org.uk
Steve Cropley, Autocar, 10th December 2012, www.autocar.co.uk
Norman Foster, Tribute, 11th December 2012, www.fosterandpartners.com
The Guardian, 10th December 2012, www.theguardian.com
Brid-Aine Parnell, The Register, 11th December 2012, www.theregister.co.uk
The Telegraph, 10th December 2012, www.telegraph.co.uk
Further reading
Neil Lyndon, Economic Cycles, FT Magazine, 6th September 2008, www.ft.com
A.E. Moulton, Moulton suspension, past and future, Sir Henry Royce Memorial Foundation Lecture, 7th June 2000
A.E. Moulton, A. Hadland, D.L. Milliken, Aerodynamic research using the Moulton, Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, Vol.220, Issue 3, May 2006
Alex Moulton, Bristol to Bradford-on-Avon: a lifetime in engineering, The Rolls-Royce Heritage Trust, 2009
Alex Moulton, Speak Out, Professional Engineering, Vol.23, Issue 9, Caspian Publishing Limited, June 2010
Alex Moulton, Jacques Grosjean and Geraint Owen, eds, The Moulton Formulae and Methods: Directly Useable for Calculations in Mechanical Engineering, Professional Engineering Publications, Wiley-Blackwell, London, 2004
Alex Newson, Fifty bicycles that changed the world, Design Museum Fifty, Hachette, UK, 2013
Portrait courtesy Mini Sport Ltd

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Biography
Alex Moulton
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Kingston Mill, Bradford-on-Avon
Kingston Mill, Bradford-on-Avon, where Moulton's great-grandfather Stephen Moulton (1794-1880) established a rubber goods factory. Moulton snr brought vulcanised rubber to Britain as an agent of Charles Goodyear (1800-60), and in 1848 purchased this mill, Grist Mill, Lower Fulling Mill, a dye house, The Hall (see below), four cottages and eight acres of land. Stephen Moulton & Co merged with George Spencer & Co forming George Spencer Moulton & Co (Spencer Moulton) on 22nd August 1891, supplying rubber components to railway companies worldwide.
Photo: taken 2008, © Sarah Charlesworth (cc-by-sa/2.0)
The Hall, Bradford-on-Avon
The Hall, Bradford-on-Avon, Wiltshire — home of the Moulton family, 1848 to 2012. It incorporates some earlier structure and was remodelled in Jacobean style around 1598-1601 for clothier John Hall (d.1631). Stephen Moulton (see above) rebuilt this elevation c.1850. It is now Grade I listed, with Grade II* listed landscaping structures, and Grade II listed grounds — and is owned by the Alex Moulton Charitable Trust.
Photo: taken 2008, © Betty Longbottom (cc-by-sa/2.0)
The Hall, Bradford-on-Avon
Barn (stables behind) to the east of The Hall. In the early 20th century, Moulton's grandfather John Moulton (1839-1925) extended and converted the stables (arch. Sir Harold Brakspear). In the 1960s, a drawing office (arch. Robert Townsend) was constructed and the stables converted into engineering workshops. Buildings now occupied in part by Moulton Bicycle Company.
Photo: taken 2008, © Betty Longbottom (cc-by-sa/2.0)
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Moulton with bike and Mini
Alex Moulton in 2010, with the Golden Jubilee space frame Moulton Bicycle and a Mini. The Mini and Moulton-designed bicycles used an innovative series of suspension systems designed by Moulton with Moulton Developments, which worked from the family estate in Bradford-on-Avon.
Photo: courtesy Dan Farrell, Moulton Bicycle Company
Moulton and Brian Harper with a Mini
Moulton with Mini Sport founder Brian Harper in August 1999, indicating the placement of the right front rubber suspension cone on a Mini.
Photo: courtesy Mini Sport Ltd
Alex Moulton
Moulton holding an example of the rubber cone spring suspension units that were fitted to all Minis manufactured up to the year 2000. The units were made by Dunlop and each weighed 900g, 600g of which was rubber. The photo was taken on 24th November 1999.
Photo: courtesy Mini Sport Ltd
Issigonia and Moulton, 1962 launch of Morris 1100
Alex Moulton (left) and Alexander Arnold 'Alec' Issigonis (1906-88, knighted 1969) in 1962 at the launch of the Morris 1100, first car to feature Moulton Development's Hydrolastic suspension — developed by Moulton in association with Issigonis, British Motor Corporation's chief designer.
Photo: British Motor Industry Heritage Trust Film & Picture Library
Morris 1100\'s Hydrolastic suspension
Detail of above. Moulton and Issigonis in front of a diagram explaining the Morris 1100's Hydrolastic suspension, which uses hydraulic fluid dampening. The 1962 prototype consisted of two 178mm diameter rubber springs (one above the other) on each wheel, with all four units connected by 16mm bore pipes. When the one millionth Hydrolastic unit was made, it was gold plated and presented to Moulton.
Photo: British Motor Industry Heritage Trust Film & Picture Library
Alec Issigonic as Longbridge, 1965
Issigonis pictured in 1965, standing between the 1959 Mini (left) and the 1965 Morris Mini Minor Deluxe, at the British Motor Corporation's Longbridge plant, Birmingham. In 1998, Moulton described his relationship with Issigonis as "wonderfully synergetic" though "Issigonis was very much a prima donna, which he quite properly should have been".
© Birmingham Museums Trust (cc-by-sa/4.0) via Wikimedia Commons
Austin Allegro with Hydragas suspension
Diagram showing the Hydragas suspension units fitted to British Leyland's Austin Allegra in 1973 — the first production car to have it. Moulton Developments had been working on Hydragas since 1967, when Anthony 'Tony' Best joined as chief engineer.
Photo: British Motor Industry Heritage Trust Film & Picture Library
1965 Series 2 Moulton
A 1965 Series 2 Moulton Bicycle, with a 'lazy F' frame. Production of the Moulton-designed bikes began in November 1962.
Photo: © Connollyb (cc-by-sa/4.0) via Wikimedia Commons
Alex Moulton with a space frame Moulton bike
Moulton with his AM space frame bicycle, 18th September 2009, The Hall, Bradford-on-Avon. Space frame models were first released in 1983.
Photo: courtesy Dan Farrell, Moulton Bicycle Company
Back wheel, Moulton TSR2
Back wheel of a Moulton TSR2 showing its dry cone rear suspension.
Photo: © Martin Thomas (cc-by-sa/2.0)
Detail, space frame Moulton bike
Detail of the Moulton space frame's front suspension, as seen at the Cycle Show, London, October 2008.
Photo: © Peter Reed (cc-by-nc/4.0)
Toby the cat crumples Moulton's drawings
Toby the cat on the desk in Moulton's study. Note the drawings and calculations! Toby arrived at The Hall as a stray.
Photo: courtesy Dan Farrell, Moulton Bicycle Company