Alfred Robert Foster (16 March 1911 – 22 March 1982) was a British professional motorcycle racer. He competed professionally from 1935 to 1951 and won the 1950 FIM 350cc Grand Prix world championship. Motorcycle racing career Foster was born in Gloucestershire, UK, and became known as the Cheltenham Flyer after he began to race motorcycles in 1932. He was a versatile rider competing in diverse motorcycle competitions such as trials and motocross but, experienced his greatest success in road racing. He rode a New Imperial in the Manx Grand Prix in 1933 and 1934 with a best result being a second place in the 1934 Lightweight race. He competed in his first Isle of Man TT race riding a New Imperial in the 1935 Lightweight TT where he failed to finish. Foster won his first Isle of Man TT race the following year riding a New Imperial in the 1936 Lightweight TT where, he exchanged the lead several times with Stanley Woods on a DKW until Woods retired on the final lap, giving Foster the victory at the then record average of 76.28 m.p.h. His victory on a unit-construction New Imperial in the 1936 Isle of Man TT marked the last time that a British-made motorcycle won a Lightweight TT. The New Imperial factory withdrew their official support from racing after the 1936 TT forcing Foster to ride an AJS 350cc R7 from 1937 to 1939. He is sponsored in the 1939 TT by Archers of Aldershot, a motorcycle shop run by the father of fellow racer Les Archer. When motorsports activities resumed following the conclusion of the Second World War, Foster won the first post-war Isle of Man TT race to be held – the 1947 Junior – when he averaged 80.31 m.p.h. on a Velocette and finished four minutes ahead of the second place finisher. He finished second to Freddie Frith in the 1948 Junior TT. In the 1949 Senior TT, Foster established a post-war lap record of 25 mins. 14 secs. (89.75 m.p.h.) aboard a Moto Guzzi and, was leading the race by 57 seconds when he retired with mechanical trouble. After the T.T. he competed in the 1949 FIM Grand Prix world championships on a Velocette where, he finished second to Freddie Frith in both the Dutch TT and the Belgian Grand Prix. Foster had his most successful season in 1950 when he battled the powerful