Häfeli DH-4
# Häfeli 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.

## Operational history

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.

## List of operators

### Switzerland

* Swiss Air Force

## Specifications

Data from The Complete Book of Fighters

General characteristics

* Crew: 1
* Length: 6 m (19 ft 8 in)
* Wingspan: 9.8 m (32 ft 2 in)
* Height: 2.6 m (8 ft 6 in)
* Wing area: 22 $m^2$ (240 sq ft)
* Empty weight: 640 kg (1,411 lb)
* Gross weight: 885 kg (1,951 lb)
* Powerplant: 1 × Hispano-Suiza HS-41 V-8 water-cooled piston engine, 112 kW (150 hp)
* Propellers: 2-bladed fixed-pitch propeller

Performance

* Maximum speed: 148 km/h (92 mph, 80 kn)
* Range: 300 km (190 mi, 160 nmi)
* Endurance: 4 hours 30 minutes
* Rate of climb: 4.5 m/s (890 ft/min)
* Time to altitude: 1,829 m (6,000 ft) in 14 minutes

Armament

* Guns: 1 x synchronised machine gun
