Francis Albert "Frank" Costin (8 June 1920 – 5 February 1995) was an automotive engineer who advanced monocoque chassis design and was instrumental in adapting aircraft aerodynamic knowledge for automobile use.
Costin was an engineer with the de Havilland Aircraft Company when, in 1954, his brother Mike, a former de Havilland engineer then working for Lotus Engineering Ltd., asked him to design an aerodynamic body for a new racing car. Intrigued by the idea of applying aerodynamics to racing cars, Costin designed the body for the Lotus Mark VIII Unlike his brother, Costin was never a Lotus employee; his work there was either as a paid consultant or as a volunteer.
In 1956, when Chapman was commissioned by Tony Vandervell to design a Grand Prix racing car to challenge Maserati and Ferrari dominance of the formula, Chapman recommended Costin to Vandervell as the body designer. Costin designed the body for the Vanwall that won the first Grand Prix Constructors' Championship.
Later, Costin used his aeronautical knowledge to design and build a chassis from plywood. This led to a lightweight, stiff structure, which he could then clothe with an efficient, aerodynamic body, a huge advantage in the low-capacity sports car racing of the immediate postwar period. He was also involved in a number of road car projects for various manufacturers including Lister and Lotus, where he contributed to the early aerodynamic designs; Marcos, which he co-founded with Jem Marsh (MARsh and COStin); and racecar chassis for Maserati, Lotus, and DTV. He also designed the Costin Amigo, the TMC Costin, and the Costin Sports Roadster. He also created an ultra-light glider with Keith Duckworth, an old friend and his brother's business partner.
In his youth, Costin had been an Olympic-standard swimmer, while in his later years he composed music.
- Tremayne, David (6 March 1995). "OBITUARY: Frank Costin". The Independent (London, UK). ISSN 0951-9467. OCLC 185201487. Retrieved 2012-07-21. "His early days of Olympic- standard swimming had given way to gentler pursuits, including composing music."
- Schreiber, Ronnie (23 June 2010). "title= Book Review: Colin Chapman: Inside The Innovator". The Truth About Cars. Retrieved 2012-07-21. "Frank Costin, Mike’s brother, was an aerodynamicist for deHavilland and Chapman’s first aero guru (Peter Wright would later fill that role with the ground effects cars), but Frank Costin never was a Lotus employee, preferring to work either for consultant fees or gratis just to see his ideas tested."
- Dennis E. Ortenburger, Flying on Four Wheels: Frank Costin and his car designs, Patrick Stephens Ltd. ISBN 0-85059-770-6