Aircraft racing competition became popular in the 20s and 30s, stimulating the design and construction of ever faster craft. The Granville Brothers had a small operation, whose most famous craft is this Gee Bee, in which Jimmy Doolittle set a 1932 record of 294 mph. The Schneider Trophy was set up in 1912 for seaplane races of at least 150 nautical miles. Supermarine aircraft won the Trophy, as they learned to design and construct fast craft, which they used to produce the famous RAF Spitfire.