Boeing F4B aircraft could out perform all existing pursuit aircraft in service. It was the last wooden U.S. biplane fighter.
Boeing F4B aircraft served throughout the U. S. Navy during the early 1930's. The U.S. Army variant of the Boeing F4B was designated the P-12.
Boeing F4B aircraft were innovative for their time in that their fuselage frames were constructed of bolted aluminum tubing, except for the engine mounts and mid-fuselage areas. Previous Boeing aircraft employed welded steel tubing throughout the aircraft. Other differences from prior models were straight rather than tapered wings.
Boeing F4B aircraft were armed with either two .30 cal. or one .50 cal. machine guns. They were located in the top of the nose, firing through the propeller.
Boeing F4B aircraft were originally equipped with a 450 h.p. Pratt and Whitney R-1340-7 radial engine. The propeller was metal, two bladed. The pitch of the propeller could be adjusted on the ground. For increased range, a 55 gallon fuel tank was fitted between the landing gear legs. Up to 700 lbs. of bombs could be carried under the wings and fuselage of the aircraft.
Soon after Boeing F4B aircraft entered service, Boeing introduced an aircraft designated the XP-12A. It incorporated improvements for trial based on suggestions by various service pilots of Boeing F4B aircrat.
The Boeing F4B model B aircraft first flew on May 12, 1930. It featured the ailerons tested on the XP-12A, revised elevators, and slightly larger wheels. The engine and struts were identical to the Boeing F4B. Later, the Boeing F4B aircraft used ring cowlings .
The Boeing F4B model B of the aircraft didn't perform as well as the original Boeing F4B aircraft due to an increase in weight.
The Boeing F4B model C first flew on Jan. 30, 1931. It featured an engine ring cowl, a spreader bar under carriage, and wingtip navigation lights. It had a new 450 hp R-1340-9 engine. The Navy version of the was designated the Boeing F4B - 2.
The Boeing F4B model D aircraft first flew on Sept. 15, 1931. The most significant change over the C model aircraft was a more powerful 525 hp. Pratt and Whitney R-1340-17 engine.
The final version Boeing F4B model E first flew as the company owned aircraft Model 218 on Sept. 29, 1930. The Boeing F4B model 218 was intended as a test aircraft for improvements over the Boeing F4B aircraft. The production Boeing F4B model E had a new, high-altitude rated R-1340-D engine.
A total of 586 Boeing F4B aircraft of all types were built. Some remained in service until 1941.