Famed racing pilot Roscoe Turner contracted with the Lawrence W. Brown Aircraft Company to build this racing aircraft. Known as the Laird Turner LTR-14 and later the Turner RT-14, the modified racer placed third in the 1937 Thompson Trophy event at the National Air Races and won the 1938 and 1939 contests. With this aircraft, Turner became the only three-time winner of the Thompson Trophy. In 1939 the aircraft was sponsored by Champion Spark Plugs and therefore carried the name "Miss Champion" on its fuselage.