Boeing F2B / Model 69


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Boeing F2B / Model 69

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.

Boeing F2B / Model 69A three-view drawing (1278 x 866)

 MODELModel 69 (F2B-1)
 ENGINE1 x 317kW Pratt & Whitney R-1340-B Wasp radial piston engine
  Take-off weight1272 kg2804 lb
  Empty weight902 kg1989 lb
  Wingspan9.17 m30 ft 1 in
  Length6.98 m23 ft 11 in
  Height2.81 m9 ft 3 in
  Wing area22.57 m2242.94 sq ft
  Max. speed254 km/h158 mph
  Cruise speed212 km/h132 mph
  Ceiling6555 m21500 ft
  Range507 km315 miles
 ARMAMENT1 x 12.7mm + 1 x 7.62mm machine-guns, 5 x 11kg bombs

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