View source for Engineering:Fokker S.II

{{Short description|Dutch trainer aircraft}}
{{more citations|date=July 2020}}

<!-- This article is a part of Wikipedia:WikiProject Aircraft. Please see Wikipedia:WikiProject Aircraft/page content for recommended layout. -->
{|{{Infobox Aircraft Begin
 |name=Fokker S.II
 |image=File:Fokker S.II op Schiphol 2161 027310.jpg
 |caption=Fokker S.II
}}{{Infobox Aircraft Type
 |type=Primary trainer
 |manufacturer=Fokker
 |designer=[[Biography:Reinhold Platz|Reinhold Platz]]
 |first flight=1922
 |introduced=
 |retired=
 |status=
 |primary user=Royal Netherlands Army Aviation Group
 |more users=
 |produced=
 |number built=15+
 |variants with their own articles=
}}
|}

The '''Fokker S.II''' was a 1920s Dutch primary trainer built by the Fokker company for service with the Dutch Army.

==Development==
[[File:Experimentele Fokker S.II met Curtiss OX-5 motor 2161 027313.jpg|thumb|left|S.II demonstrator with Curtiss OX-5 engine as offered to the USAAS.]]

The S.II was designed by [[Biography:Reinhold Platz|Reinhold Platz]] as the second Fokker primary trainer, but unlike the earlier [[Engineering:Fokker S.I|S.I]] monoplane the '''S.II''' was an unequal-span single-bay biplane with a fixed cross-axle landing gear. It had side-by-side seating for an instructor and pupil and was originally powered by an 82&nbsp;kW (110&nbsp;hp) Thulin rotary engine. The engine was later replaced with a Le Rhone-Oberursel engine.

The aircraft was ordered by the LVA (Dutch Army Aviation) who purchased 15. One aircraft was modified to use a Curtiss OX-5 engine to elicit a response from the United States Army Air Service but they were not interested and the aircraft was returned to standard configuration.

==Operation history==
The 15 aircraft served with the Dutch Army until 1932 but one of the aircraft were converted to an Ambulance configuration and designated the '''S.IIA'''. It was still in service when {{wipe|Germany}} forces invaded the Netherlands in 1940. The S.IIA gained national notability in December 1933, when it was used for a mercy flight to carry two sick children and  a young woman to hospital.

==Variants==
[[File:Fokker S.IIA ambulance vliegtuig (2161 027319).jpg|thumb|right|The Fokker S.IIA ambulance aircraft]]
;S.II
:Production version, 15 built.
;S.IIA
:One S.II modified to carry stretchers as an ambulance aircraft.

==Operators==
;{{NLD}}
*Dutch Army Aviation
;{{USSR}}
*{{wipe|Soviet Air Force}} - Two aircraft.

==Specifications (S.II)==
{{Aircraft specs
|ref=<!-- reference -->
|prime units?=met
<!--
        General characteristics
-->

|crew=2
|capacity=
|length m=
|length ft=
|length in=
|length note=
|span m=
|span ft=
|span in=
|span note=
|upper span m=
|upper span ft=
|upper span in=
|upper span note=
|mid span m=
|mid span ft=
|mid span in=
|mid span note=
|lower span m=
|lower span ft=
|lower span in=
|lower span note=
|swept m=<!-- swing-wings -->
|swept ft=<!-- swing-wings -->
|swept in=<!-- swing-wings -->
|swept note=
|dia m=<!-- airships etc -->
|dia ft=<!-- airships etc -->
|dia in=<!-- airships etc -->
|dia note=
|width m=<!-- if applicable -->
|width ft=<!-- if applicable -->
|width in=<!-- if applicable -->
|width note=
|height m=
|height ft=
|height in=
|height note=
|wing area sqm=
|wing area sqft=
|wing area note=
|swept area sqm=<!-- swing-wings -->
|swept area sqft=<!-- swing-wings -->
|swept area note=
|volume m3=<!-- lighter-than-air -->
|volume ft3=<!-- lighter-than-air -->
|volume note=
|aspect ratio=<!-- sailplanes -->
|airfoil=
|empty weight kg=
|empty weight lb=
|empty weight note=
|gross weight kg=
|gross weight lb=
|gross weight note=
|max takeoff weight kg=
|max takeoff weight lb=
|max takeoff weight note=
|fuel capacity=
|lift kg=<!-- lighter-than-air -->
|lift lb=<!-- lighter-than-air -->
|lift note=
|more general=
<!--
        Powerplant
-->
|eng1 number=1
|eng1 name=Rhône-Oberursel
|eng1 type=9-cyl. air-cooled rotary piston engine
|eng1 kw=67
|eng1 hp=<!-- prop engines -->
|eng1 shp=<!-- prop engines -->
|eng1 kn=<!-- jet/rocket engines -->
|eng1 lbf=<!-- jet/rocket engines -->
|eng1 note=
|power original=
|thrust original=
|eng1 kn-ab=<!-- afterburners -->
|eng1 lbf-ab=<!-- afterburners -->

|eng2 number=
|eng2 name=
|eng2 type=
|eng2 kw=<!-- prop engines -->
|eng2 hp=<!-- prop engines -->
|eng2 shp=<!-- prop engines -->
|eng2 kn=<!-- jet/rocket engines -->
|eng2 lbf=<!-- jet/rocket engines -->
|eng2 note=
|eng2 kn-ab=<!-- afterburners -->
|eng2 lbf-ab=<!-- afterburners -->

|eng3 number=
|eng3 name=
|eng3 type=
|eng3 kw=<!-- prop engines -->
|eng3 hp=<!-- prop engines -->
|eng3 shp=<!-- prop engines -->
|eng3 kn=<!-- jet/rocket engines -->
|eng3 lbf=<!-- jet/rocket engines -->
|eng3 note=
|eng3 kn-ab=<!-- afterburners -->
|eng3 lbf-ab=<!-- afterburners -->
|more power=

|prop blade number=<!-- propeller aircraft -->
|prop name=
|prop dia m=<!-- propeller aircraft -->
|prop dia ft=<!-- propeller aircraft -->
|prop dia in=<!-- propeller aircraft -->
|prop dia note=

|rot number=<!-- helicopters -->
|rot dia m=<!-- helicopters -->
|rot dia ft=<!-- helicopters -->
|rot dia in=<!-- helicopters -->
|rot area sqm=<!-- helicopters -->
|rot area sqft=<!-- helicopters -->
|rot area note=
<!--
        Performance
-->
|perfhide=

|max speed kmh=
|max speed mph=
|max speed kts=
|max speed note=
|max speed mach=<!-- supersonic aircraft -->
|cruise speed kmh=
|cruise speed mph=
|cruise speed kts=
|cruise speed note=
|stall speed kmh=
|stall speed mph=
|stall speed kts=
|stall speed note=
|never exceed speed kmh=
|never exceed speed mph=
|never exceed speed kts=
|never exceed speed note=
|minimum control speed kmh=
|minimum control speed mph=
|minimum control speed kts=
|minimum control speed note=
|range km=
|range miles=
|range nmi=
|range note=
|combat range km=
|combat range miles=
|combat range nmi=
|combat range note=
|ferry range km=
|ferry range miles=
|ferry range nmi=
|ferry range note=
|endurance=<!-- if range unknown -->
|ceiling m=
|ceiling ft=
|ceiling note=
|g limits=<!-- aerobatic -->
|roll rate=<!-- aerobatic -->
|glide ratio=<!-- sailplanes -->
|climb rate ms=
|climb rate ftmin=
|climb rate note=
|time to altitude=
|sink rate ms=<!-- sailplanes -->
|sink rate ftmin=<!-- sailplanes -->
|sink rate note=
|lift to drag=
|wing loading kg/m2=
|wing loading lb/sqft=
|wing loading note=
|disk loading kg/m2=
|disk loading lb/sqft=
|disk loading note=
|fuel consumption kg/km=
|fuel consumption lb/mi=
|power/mass=
|thrust/weight=

|more performance=
<!--
        Armament
-->
|armament=<!-- add bulletted list here or if you want to use the following 
specific parameters, remove this parameter-->
|guns= 
|bombs= 
|rockets= 
|missiles= 
|hardpoints=
|hardpoint capacity=
|hardpoint rockets=
|hardpoint missiles=
|hardpoint bombs=
|hardpoint other=

|avionics=
}}
<!-- ==See also== -->
{{aircontent
<!-- include as many lines are appropriate. additional lines/entries with carriage return. -->
|see also=
|related=<!-- related developments -->
|similar aircraft=<!-- similar or comparable aircraft -->
|sequence=<!-- designation sequence, if appropriate -->
|lists=<!-- related lists -->
}}

==References==
* The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985), 1985, Orbis Publishing, Page 1899
<!-- ==External links== -->


[[Category:Biplanes]]
[[Category:Single-engined tractor aircraft]]

{{Sourceattribution|Fokker S.II}}