A proposed two seat-variant, the Brown B-3 Super Sport had two seats in tandem under an enclosed cockpit.

Intended as a long-distance racer as well as a touring aircraft, only one Brown B-3 (NX266Y) was built and sold to Dr. Ross Sutherland from Los Angeles.

The Brown B-3 is featured in Flight for Freedom (1943) as the racing aircraft flown by the lead character.

[2] The B-3 is featured as a prototype fighter aircraft in Flight Lieutenant (1942) and crashes out of shot in the final scene.

The B-3 can also be seen sitting on the ramp during the scene of Humphrey Bogart's famous goodbye in the film Casablanca (1942).