Häfeli DH-1
{{short description|1910s Swiss reconnaissance aircraft}}
{{Infobox aircraft
|name = DH-1
|image = Häfeli DH-1 rear view.jpg
|caption =
|type = Reconnaissance biplane
|manufacturer = K+W
|designer = August Häfeli
|first_flight = 1916
|introduction = 1916
|retired = 1919
|status =
|primary_user = Swiss Air Force
|more_users =
|produced =
|number_built = 6
|unit cost =
|developed_from =
|variants =
}}
The Häfeli DH-1 was a 1910s Swiss two-seat reconnaissance aircraft, built by the aircraft department of the Federal Construction Works (Eidgenoessische Konstruktionswerkstaette, K+W) at Thun, Switzerland.{{cite web | url=https://flyingmachines.ru/Site2/Crafts/Craft30001.htm | title=Hafeli DH-1 }}
Development and design
In 1915 K + W set up their aircraft department 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 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.{{cite web | url=http://www.wwi-models.org/Photos/Swiss/HafeliDH1/index.html | title=Hafeli DH-1 }}{{cite web | url=https://flyingmachines.ru/Site2/Crafts/Craft30001.htm | title=Hafeli DH-1 }}
Operational history
Six DH-1s were built during 1916 but within a year three had been destroyed in accidents.{{cite web | url=https://asn.flightsafety.org/asndb/country/hb/1/1917 | title=Aviation Safety Network > > ASN Aviation Safety Database results }} The survivors were withdrawn from service in 1919 and scrapped.
Operators
;{{SUI}}
Specifications (DH-1)
{{Aircraft specs
|ref=The Illustrated Encyclopedia of Aircraft (Part Work 1982–1985){{cite book |title= The Illustrated Encyclopedia of Aircraft (Part Work 1982–1985)|publisher= Orbis Publishing}}
|prime units?=met
|crew=2
|capacity=
|length m=8.82
|span m=12.8
|height m=3
|wing area sqm=38
|aspect ratio=
|airfoil=
|empty weight kg=750
|gross weight kg=1125
|max takeoff weight kg=
|fuel capacity=
|more general=
|eng1 number=1
|eng1 name=Argus As II
|eng1 type=six-cylinder in-line water-cooled piston engine
|eng1 hp=120
|prop blade number=2
|prop name=wooden fixed-pitch pusher propeller
|prop dia m=
|prop dia ft=
|prop dia in=
|prop dia note=
|max speed kmh=126
|max speed mach=
|cruise speed kmh=
|stall speed kmh=
|never exceed speed kmh=
|minimum control speed kmh=
|range km=250
|combat range km=
|ferry range km=
|endurance=
|ceiling m=9840
|g limits=
|roll rate=
|climb rate ms=
|time to altitude=
|wing loading kg/m2=
|fuel consumption kg/km=
|power/mass=
|thrust/weight=
|more performance=
}}
References
External links
{{commons category|Häfeli DH-1}}
- ETH-Bibliothek Zürich, Bildarchiv. [http://doi.org/10.3932/ethz-a-000033208 Häfeli DH-1 (M I) No 243 with Argus As II engine], [http://viewer.e-pics.ethz.ch/ETHBIB.Bildarchiv/index2.php?id=ETHBIB.Bildarchiv_Ans_05050-060 viewer]
- [https://web.archive.org/web/20120325182510/http://www.luftfahrtmuseum.com/htmd/dtf/hfdh1.htm Das Virtuelle Luftfahrtmuseum: K+W DH 1]
{{DEFAULTSORT:Hafeli Dh-1}}
Category:1910s Swiss military reconnaissance aircraft