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K+W Häfeli DH-1
In 1915 the Federal Construction Works (Eidgenoessische Konstruktionswerkstaette, K+W) set up their aircraft department at Thun, Switzerland and employed August Häfeli as chief engineer. Häfeli had previously designed the AGO C.I and AGO C.II, German reconnaissance biplanes. His first design was the Häfeli DH-1, similar in concept to his designs for AGO Flugzeugwerke.
The DH-1 reconnaissance biplane was a three-bay biplane of wood and fabric construction, it had a fuselage pod with tandem seating for the two-man crew and twin booms mounting the tail. The DH-1 was powered by an Argus As II engine built under licence by Buhler Brothers Limited. Six aircraft were built for the Swiss Air Force.
Six DH-1s were built during 1916 but within a year three had been destroyed in accidents. The survivors were withdrawn from service in 1919 and scrapped.
Engine: 1 × Argus As II, 120 hp (89 kW)
Wingspan: 42 ft 0 in (12.80 m)
Wing area: 409.04 ft² (38 m²)
Length: 28 ft 11¼in (8.82 m)
Height: 9 ft 10 in (3 m)
Empty weight: 1,653 lb (750 kg)
Max. takeoff weight: 2,480 lb (1125 kg)
Maximum speed: 78mph (126 km/h)
Range: 155 miles (250 km)
Service ceiling: 9,840 ft (3000 m)
Crew: two
Armament: one 0.293 in (7.45 mm) machine-gun

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