The Boeing XF6B-1 / XBFB-1 was Boeing's last biplane design for the United States Navy. Only the one prototype, Model 236, was ever built; although first flying in early 1933, it rammed into a crash barrier in 1936 and the design was not pursued further.
The Boulton & Paul P.33 Partridge was a single seat single-engined biplane fighter designed to an Air Ministry specification. One prototype was ordered and built for trials in 1928, but it was not put into production.
