Laird LC-DW-500 Super Solution

The 'Doolittle Shell' racer is the Laird LC-DW-500 Super Solution, a single-seat racing biplane built by the E.M. Laird Airplane Company and flown by James 'Jimmy' Doolittle under Shell Oil Company sponsorship. Doolittle used the Super Solution to win the first Bendix Trophy transcontinental race in 1931, flying coast-to-coast and setting a record. For the 1932 season, Shell and Doolittle heavily modified the aircraft, but it was wrecked in a forced landing before the National Air Races; Doolittle then borrowed the Granville Gee Bee R-1, winning the 1932 Thompson Trophy and setting a world landplane speed record of about 294 mph.

The Super Solution was powered by a highly tuned Pratt & Whitney Wasp Junior radial. Note that the label 'Doolittle Shell Racer' is misspelled in the source.