Grumman XSBF
| XSBF-1 | |
|---|---|
 |
|
| Role | Scout bomber |
| Manufacturer | Grumman |
| First flight | 18 February 1936 |
| Primary user | United States Navy |
| Number built | 1 |
| Developed from | Grumman SF |
| Type | Prototype |
| Serial | 9996 |
| Fate | Crashed, 25 May 1939 |
The Grumman XSBF, also known by the company designation G-14, was an American biplane scout bomber developed by Grumman Aircraft for the United States Navy during the 1930s. Derived from Grumman's successful "Fifi" fighter, the aircraft was developed at a time when the biplane was giving way to the monoplane. In competition against other aircraft it proved to possess inferior performance in its intended role, and did not enter production. The sole prototype went on to serve as a liaison aircraft, as well as being used in experiments by NACA, before being destroyed in a crash in 1939.
In late 1934, the U.S. Navy's Bureau of Aeronautics (BuAer) issued a specification for new scout bomber and torpedo bomber designs. Eight companies submitted 10 designs in response, evenly split between monoplanes and biplanes. Grumman, having successfully provided the FF and F2F fighters to the Navy, along with the SF scout, submitted an advanced development of the SF-2 in response to the specification's request for a 5,000 lb (2,300 kg) aircraft capable of carrying a 500 lb (230 kg) bomb. Given the model number G-14 by Grumman, the aircraft received the official designation XSBF-1 by the Navy, and a contract for a single prototype was issued in March 1935.
The XSBF-1 was a two-seat biplane, featuring an enclosed cockpit, a fuselage of all-metal construction, and wings covered largely with fabric. Power was provided by a 650 hp (480 kW)Pratt & Whitney R-1535 Twin Wasp Junior air-cooled radial engine driving with a variable-pitch propeller. Armament was planned to be two .30 in (7.62 mm) forward-firing M1919 Browning machine guns, one of which could be replaced by a .50 in (12.7 mm) M2 Browning; the prototype carried only a single gun. A single .30 in weapon was fitted in the rear cockpit for defense, and one 500 lb (230 kg) bomb to be carried in a launching cradle under the fuselage. The arrestor hook was carried in a fully enclosed position, while flotation bags were fitted in the wings in case the aircraft was forced to ditch. The landing gear of the XSBF-1 was similar to that of the F3F fighter.
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