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Grahame-White Type XI / Naval and Military Biplane
 
The Grahame-White Type XI (also known as the "Naval and Military Biplane") was an early aircraft built in the United Kingdom and marketed as being particularly well-suited to military applications. Designed by J. D. North, it was a two-bay biplane of pod-and-boom configuration with un-staggered wings of slightly unequal span. The pilot and an observer sat in tandem, open cockpits in a streamlined nacelle, with the 100 hp Gnome engine mounted pusher-fashion behind them. Unusually for an aircraft of this period, the propeller was not driven directly by the engine, but rather, via a sprocket and chain system that geared it down in the ratio of 14/23. The undercarriage was of the fixed, tailskid type but was designed to be easily exchanged for pontoons. Construction throughout was fabric-covered wood, with the exception of a neat aluminium cowling for the engine and transmission.
 
A sample was exhibited at the Olympia Aero Show in 1914. It remained in prototype form.
 
Engine: 1 × Gnome Monosoupape 9 Type B-2, 100 hp (75 kW)
Wingspan: 37 ft 0 in (11.28 m)
Length: 26 ft 6 in (8.08 m)
Empty weight: 1,000 lb (455 kg)
Maximum speed: 80 mph (130 km/h)
Endurance: 5 hours
Crew: Two, pilot and observer
 
 
 
 


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