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Design and development
During assembly, the second prototype XO-27 was converted to a bomber prototype, dubbed the XB-8. While the XB-8 was much faster than existing biplane bombers, it did not have the bomb capacity to be considered for production. Two YB-8s and 4 Y1B-8s were ordered, but these were changed mid-production to Y1O-27 configuration.
The wing of the XB-8 and XO-27 was built entirely from wood, although the fuselage was constructed of steel tubes covered with fabric with the exception of the nose which had a corrugated metal. They featured the first retractable landing gear ever fitted to an Army Air Corps bomber or observation craft. The undercarriage retracted electrically. Crew was three in tandem position.
It competed against a design submitted by Douglas Aircraft Company, the Y1B-7/XO-36. Both promised to greatly exceed the performance of the large biplane bombers then used by the Army Air Corps. However, the Douglas XB-7 was markedly better in performance than the XB-8, and no further versions of Fokker's aircraft were built.
Data from Fokker's TwilightGeneral characteristics
- Crew: 4
- Length: 47 ft 4 in (14.42 m)
- Wingspan: 64 ft 4 in (19.60 m)
- Height: 11 ft 6 in (3.50 m)
- Wing area: 619 ft² (57.5 m²)
- Empty weight: 6,861 lb (3,112 kg)
- Loaded weight: 10,650 lb (4,824 kg)
- Powerplant: 2 × Curtiss V-1570-23 "Conqueror" V12 engines, 600 hp (450 kW) each
- Maximum speed: 160 mph (140 kn, 260 km/h)
- Related development
- Aircraft of comparable role, configuration and era
- Related lists
- Cellier, Alfred (23 August 1934), "American Military Monoplanes", Flight: 864
- Pelletier 2005, p. 64.
- Pelletier, Alain J. "Fokker Twilight". Air Enthusiast, No. 117, May/June 2005, pp. 62–66. ISSN 0143-5450.
- Wagner, Ray. American Combat Planes. New York: Doubleday, 1982. ISBN 0-930083-17-2.
|40x40px||Wikimedia Commons has media related to Fokker military aircraft.|
- O-27 USAAS 1000 Aircraft Photos
- ge&q=Popular%20Science%201931%20plane&f=true "Army's Mystery Plane Passes Speed Test", December 1930, Popular Science, bottom of p. 56
- Atlantic (Fokker) XB-8, National Museum of the US Air Force