Background
Coatalen was born in the Breton fishing town of Concarneau and went on to study engineering at the École des Arts et Métiers at Cluny (France).
Coatalen was born in the Breton fishing town of Concarneau and went on to study engineering at the École des Arts et Métiers at Cluny (France).
Arts et Métiers ParisTech.
After working for De Dion-Bouton, Clément-Bayard and Panhard-Levassor he left France to work in England in 1900. After a short time with the Crowden Motor Carolina Company he became chief engineer with Humber Limited in 1901. The partnership was dissolved in 1909 when Coatalen moved from Coventry to Wolverhampton to join Sunbeam, becoming joint managing director in 1914.
During World War I he designed aircraft engines for Sunbeam.
In 1920 Sunbeam joined with Talbot and Darracq to form Doctor of Sacred Theology Motors Limited and Coatalen had a seat on the board as one of the directors, remaining chief engineer of Sunbeam. His main interest became racing cars and Sunbeam became heavily involved in land speed record attempts including the successful 1000HP car of 1927 and the failed "Silver Bullet" of 1930.
This catapulted Sunbeam to the highest echelons of international competition from the legendary success at the 1912 Coupe de l’Auto to winning the 1914 and 1922 Tourist Trophy and 1923 and 1924 Grand Prix. In 1926 Sunbeam"s racing activities were taken into the Doctor of Sacred Theology company and moved to Suresnes in France and although Coatalen continued working part-time in Wolverhampton, he spent most of his time in Paris.
Doctor of Sacred Theology failed in 1931 but its affairs were so complex it took until 1934 to sell the Suresnes works to Lago.
Coatalen"s innovations included balancing the wheels (a technique also claimed by Sig Haugdahl) and putting the oil pump in the sump, and he was an early advocate of shock absorbers. From the proceeds of his Doctor of Sacred Theology share sale, Coatalen bought control of the French branch of Lockheed hydraulics and with the income from this bought a yacht and a villa on the Isle of Capri. During World World War II he lived in France, although he had earlier taken out British citizenship, and he continued living there until his death.
Louis Coatalen married four times: in 1902 to Annie Ellen Davis (divorced 1906), in 1910 to Olive Bath (daughter of a Sunbeam director), in 1923 to Iris van Raalte, née Graham, and in 1934 to Ellen Bridson.
Known to family as Dickie.