Häfeli DH-4

__NOTOC__Infobox Aircraft
name = Häfeli DH-4
type = fighter
manufacturer = K+W


caption =
designer = August Häfeli
first flight = early avyear|1918
introduced =
retired =
status =
primary user = Swiss Air Force
more users =
produced =
number built = 1
unit cost =
variants with their own articles =

The Häfeli DH-4 was a Swiss fighter prototype in the late 1910s. 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

;SUI

Specifications

aircraft specifications

plane or copter?=plane
jet or prop?=prop
crew=Two
span main=9.80 m
span alt=32 ft 2 in
area main=22.00m²
area alt= 236.8 ft²
length main=6.00m
length alt=19 ft 8¼ in
height main=2.60 m
height alt=8 ft 6⅓ in
empty weight main=640 kg
empty weight alt=1,410 lb
loaded weight main=885 kg
loaded weight alt=1,951 lb
max takeoff weight main=
max takeoff weight alt=
more general=
engine (prop)=Hispano-Suiza HS-41
type of prop=eight cylinder water-cooled engine
number of props=1
power main=112 kW
power alt=150 hp
max speed main=148 km/h
max speed alt=92 mph
max speed more=
range main= 300 km
range alt= 186 miles
ceiling main=
ceiling alt=
climb rate main= 4.5m/sec
climb rate alt= 886 ft/min
loading main=
loading alt=
power/mass main=
power/mass alt=
more performance=
*Time to 6,000 ft: 14 minutes
*Endurance: 4.5 hours
guns=1 x synchronised machine gun

Bibliography

* William Green and Gordon Swanborough. "The Complete Book of Fighters". Colour Library Direct, Godalming, UK: 1994. ISBN 1-85833-777-1.