Hafeli DH-4

The Häfeli DH-4 was a Swiss fighter prototype in the late 1910s, build by the Eidgenoessische Konstruktionswerkstaette. The DH-4 was a single-seat fighter based on the successful Häfeli DH-3 design. It was made of wood with fabric covering, and carried one machine gun.

Hafeli DH-4
Class Aircraft
Type Fighter
Manufacturer Eidgenoessische Konstruktionswerkstaette
Origin Switzerland
Country Name Origin Year
Switzerland 1918
Country Name Operational Year Retirement Year
Switzerland View
ManufacturerName Production From Production To Quantity
Eidgenoessische Konstruktionswerkstaette 1 View

The Swiss Air Force trialled it from May 1918 to August 1918, but the DH-4 was found to possess disappointing performance and poor handling. As such only one was ever produced and production ceased in late 1918.

Role fighter
Manufacturer K+W
Designer August Häfeli
First flight early 1918
Primary user Swiss Air Force
Number built 1

General characteristics

  • Crew: Two
  • Length: 6.00m (19 ft 8¼ in)
  • Wingspan: 9.80 m (32 ft 2 in)
  • Height: 2.60 m (8 ft 6? in)
  • Wing area: 22.00m² (236.8 ft²)
  • Empty weight: 640 kg (1,410 lb)
  • Loaded weight: 885 kg (1,951 lb)
  • Powerplant: 1 × Hispano-Suiza HS-41 eight-cylinder water-cooled engine, 112 kW (150 hp)


  • Maximum speed: 148 km/h (92 mph)
  • Range: 300 km (186 miles)
  • Rate of climb: 4.5m/s (886 ft/min)
  • Time to 6,000 ft: 14 minutes
  • Endurance: 4.5 hours


  • Guns: 1 x synchronised machine gun

End notes