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K+W Häfeli DH-5
Häfeli DH-5
The Häfeli DH-5 was a two-seat reconnaissance aircraft designed by August Häfeli. It was a single-bay biplane of wood and fabric construction. The aircraft was powered by a 180 hp (134 kW) LFW I engine produced by the Swiss Locomotive and Machine Works.
Built by the aircraft department of the Federal Construction Works (Eidgenoessische Konstruktionswerkstaette, K + W) at Thun, Switzerland, test flying of the prototype commenced in March 1919 and 39 were ordered. Some aircraft were later modified with Handley Page slats.
A second batch of 20 aircraft were powered by a 200 hp (149 kW) LFW II engine. A further batch of 20 aircraft designated the DH-5A used the LFW III engine.
The DH-5 entered service in 1922 with the Swiss Air Force and was not withdrawn from service until 1940.
Initial production version with either the LFW I or LFW II engine.
Version with a 220 hp (164 kw) LFW III engines, survivors were modified at Thun in 1932 with Handley Page slats and changes to allow crew to wear parachutes.
Trials aircraft powered by a Hispano-Suiza HS-42 (8Fb) engine imported from France. The aircraft was not ordered into production due lack of availability of the engines and the DH-5X crashed in 1933.
Engine: 1 × LFW III, 220 hp (164 kW)
Wingspan: 39 ft 4½ in (12 m)
Wing area: 338 ft² (31.40 m²)
Length: 24 ft 11¼ in (7.60 m)
Height: 10 ft 2 in (3.10 m)
Empty weight: 1,894 lb (859 kg)
Max takeoff weight: 2,802 lb (1271 kg)
Maximum speed: 112 mph (180 km/h)
Range: 298 miles (480 km)
Service ceiling: 18,375 ft (5600 m)
one fixed forward-facing machine-gun
one pivoted machine-gin in the rear cockpit
Crew: two

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