Louis Coatalen
Louis Coatalen | |
|---|---|
| Born | 11 September 1879 Concarneau, Brittany, France |
| Died | 23 May 1962 (aged 82) Paris, France |
| Occupation(s) | Automotive engineer, racing driver |
| Years active | 1900–1930s |
| Known for | Engineering internal combustion engines for automobiles and aircraft; Sunbeam racing cars; aero engines during WWI |
Louis Hervé Coatalen (11 September 1879 – 23 May 1962) was a distinguished automotive engineer and competitive driver originally from Brittany. He spent a significant portion of his professional life in the United Kingdom, where he also obtained British citizenship. Coatalen was instrumental in advancing the design and engineering of internal combustion engines for both automobiles and aircraft.
France
Born as the second son to J Coatalen in the Breton fishing port of Concarneau / Konk-Kerne, Coatalen pursued his engineering education at Arts et Métiers ParisTech located in Cluny, France.
Career
Following his initial training periods at De Dion-Bouton, Clément, and Panhard et Levasseur, Coatalen relocated to England in 1900. After a short tenure with Crowden Motor Car Company, he joined Humber Limited in 1901, where he eventually rose to the position of chief engineer. Among his notable contributions were the design of the 8-10 and 10-12 models for Humber, which were relatively traditional compared to his later, more groundbreaking projects.
In 1906, Coatalen formed a business alliance with bicycle manufacturer William Hillman. By 1908, he competed with their Hillman-Coatalen automobile in the Isle of Man Tourist Trophy race.
Sunbeam
The collaboration with Hillman concluded in 1909 when Coatalen joined Sunbeam based in Wolverhampton. He was appointed joint managing director alongside William M Iliff in 1914.
Sunbeam 12-16
Coatalen’s 1912 design of the Sunbeam 12-16 received high praise; three vehicles secured the top three finishes in Dieppe’s Coupe de l'Auto for the 3-litre category, with the winner also achieving third place overall in the Grand Prix event. Nonetheless, his later designs demonstrated less originality, often drawing heavily from Peugeot innovations rather than introducing novel engineering concepts.
Grand Prix races
Sunbeam vehicles claimed victory at the Tourist Trophy races in both 1914 and 1922. The Sunbeam cars that occupied the podium’s top three spots at the 1923 French Grand Prix were reportedly influenced by Fiat’s engineering approaches.
Aero engines
During the First World War, Coatalen developed aircraft engines for Sunbeam. Upon his passing in 1962, Lord Sempill recognized Coatalen as one of the trio of foremost designers behind aircraft and airship engines used by the RNAS during the conflict, alongside W O Bentley and Sir Henry Royce.
Sunbeam manufactured a broader range of aero engines than any other firm throughout the war. W O Bentley attributed this achievement to Coatalen’s adeptness at advocating for his designs with both the Admiralty and War Office.
In 1920, following Sunbeam’s merger with Clément-Talbot and Darracq to establish STD Motors Limited, Coatalen became a director of STD Motors, while maintaining his chief engineer role at Sunbeam. He subsequently managed technical and design departments across all STD group companies.
Race cars
Building on the success of Talbot-Darracq’s 1.5-litre racing cars, Coatalen concentrated on developing competitive racing automobiles. Their achievements propelled Sunbeam into elite international motorsport competitions, spanning from victories at the 1912 Coupe de l’Auto to wins in the 1914 and 1922 Tourist Trophy, as well as triumphs at the Grand Prix events in 1923 and 1924. He worked closely with renowned designer Ernest Henry on the 1922 Grand Prix Sunbeams, which were piloted by prominent drivers such as Henry Segrave, Jean Chassagne, and Kenelm Lee Guinness.
In 1926, Sunbeam’s racing division was absorbed into STD Motors and operations were transferred to Suresnes, France. While Coatalen maintained part-time involvement from Wolverhampton, his primary base shifted to Paris.
Under Coatalen’s guidance, Sunbeam became one of the earliest British manufacturers to implement front wheel braking systems. His engineering innovations also encompassed wheel balancing techniques, integrating oil pumps within engine sumps, and pioneering early use of shock absorbers.
Record-breaking Achievements
Sunbeam played a significant role in attempts to set land speed records, most notably with the victorious 1927 1000HP vehicle and the less successful 1930 Silver Bullet. Coatalen engineered the powerplants for the pioneering automobiles that first surpassed speeds of 150 mph and later 200 mph, including the 1000 horsepower Sunbeam piloted by Henry Segrave.
France
After selling his shares in S T D, Coatalen invested the proceeds to gain control over Lockheed Hydraulics’ French division. This acquisition enabled him to purchase both a yacht and a villa located on the Isle of Capri. Throughout World War II, he lived in France and remained there until his unexpected passing in Paris in 1962 at the age of 82.
Marital History
Louis Coatalen entered into matrimony four times: first with Annie Ellen Davis (1902–1906), then Olive Bath (1910), who was the daughter of Sunbeam director Henry J Bath, followed by Iris van Raalte née Graham (1923), and finally Ellen Bridson (1934). There is no documented evidence of any marriage involving a member of the Hillman family.
Industry Influencer
Following Coatalen’s obituary, motor industry specialist Anthony S Heal characterized him as an impresario who motivated others to accomplish extraordinary achievements. W O Bentley commended him as an exceptional businessman who experienced both significant gains and losses with Sunbeam, highlighting his education, sharp wit, engaging storytelling, and commitment to motor racing.