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| In April 1925 the USAAC issued a specification for a single-seat fighter to be powered by a new 447kW Packard engine of inverted layout. Boeing's airframe for this requirement was generally similar to that of the Model 15 family, but recognisable easily by an unusual feature/namely the incorporation of a coolant radiator in the
centre-section of the lower wing. Designated XP-8 (Boeing Model 66),
this failed to win a production contract.
US Navy evaluation of the FB-4 with a
Wright P-1 radial engine, which gave a
benefits of these air-cooled powerplants, led to this aircraft being re-engined with a Pratt & Whitney Wasp. Redesignated FB-6, it was flight-tested exhaustively, and demonstrated the clear superiority of the Wasp, leading to a decision to combine this engine with an airframe based on the Model 66. From this marriage of airframe and powerplant was produced the Boeing Model 69, designated XF2B-1 by the US Navy, and first flown in prototype form on 3 November 1926. It differed mainly in having the span of upper and lower wings more nearly equal, and by the propeller having a large spinner.
Satisfactory testing of the prototype resulted in an order for 32 production aircraft under the designation F2B-1, with deliveries beginning on 30 January 1928, and these served with US Navy Squadrons VF-1B (fighter) and VB-2B (bomber) on board USS Saratoga. The F2B-1s differed from the prototype by deletion of the spinner, and introduction of a balanced rudder.
 | A three-view drawing (1278 x 866) |
| MODEL | Model 69 (F2B-1) |
| ENGINE | 1 x 317kW Pratt & Whitney R-1340-B Wasp radial piston engine |
| WEIGHTS |
| Take-off weight | 1272 kg | 2804 lb |
| Empty weight | 902 kg | 1989 lb |
| DIMENSIONS |
| Wingspan | 9.17 m | 30 ft 1 in |
| Length | 6.98 m | 23 ft 11 in |
| Height | 2.81 m | 9 ft 3 in |
| Wing area | 22.57 m2 | 242.94 sq ft |
| PERFORMANCE |
| Max. speed | 254 km/h | 158 mph |
| Cruise speed | 212 km/h | 132 mph |
| Ceiling | 6555 m | 21500 ft |
| Range | 507 km | 315 miles |
| ARMAMENT | 1 x 12.7mm + 1 x 7.62mm machine-guns, 5 x 11kg bombs |
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