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<!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see [[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. -->
{|{{Infobox Aircraft Begin
 |name=HA-11/33, Wn 11
 |image=Hirtenberger HA 11 photo Le Pontentiel Aérien Mondial 1936.jpg
 |caption=
}}{{Infobox Aircraft Type
 |type=Utility amphibian
 |national origin=Austria
 |manufacturer=[[Hopfner (aircraft manufacturer)|Hopfner]], [[Wiener-Neustädter-Flugzeugwerke|WNF]]
 |designer=[[Theodor Hopfner]]
 |first flight=1933
 |introduced=
 |retired=
 |status=
 |primary user=
 |more users=
 |produced=
 |number built=
 |variants with their own articles=
}}
|}
The '''Hopfner HA-11/33''' was an amphibious flying boat built in Austria in 1933 to a specification by the [[Dr. Oetker]] company. The result was a conventional, high-wing cantilever monoplane with a stepped flying boat hull and pontoons on struts under the wings at mid-span. The cabin was fully enclosed, and the twin engines were mounted tractor-fashion on struts above the wing.

==Development==
A HA-11/33 was purchased by the [[Austrian Air Force (1927-1938)|Austrian Air Force]], and was subsequently absorbed into the German [[Luftwaffe]] following the [[Anschluss]]. Deemed worthy of further development, [[Wiener-Neustädter-Flugzeugwerke|WNF]] (which had absorbed [[Hirtenberger Patronen, Zündhutchen und Metallwarenfabrik|Hirtenberg]], which itself had taken over [[Hopfner (aircraft manufacturer)|Hopfner]]) was tasked with developing it into a military training aircraft for flying boat pilots. Designated '''WNF Wn 11''' by the [[Reichsluftfahrtministerium|RLM]], testing was undertaken at [[Travemünde]] in 1940, but the type was not ordered into production. Development of a highly streamlined derivative with [[Hirth HM 508]] engines, the '''WNF Wn 11C''' was also abandoned.
<!-- ==Operational history== -->
<!-- ==Variants== -->
<!-- ==Units using this aircraft/Operators (choose)== -->
==Specifications==
{{Aircraft specs
|ref=<ref name="histav">{{cite web|title=Hopfner HA 1133 = WNF Wn 11|url=http://histaviation.com/hopfner_ha_1133_wn_11.html|accessdate=14 January 2017}}</ref>
|prime units?=met
<!--
        General characteristics
-->
|genhide=

|crew=1
|capacity=3 pax
|length m=10.17
|span m=14.11
|height m=3.15
|wing area sqm=30.4
|aspect ratio=<!-- sailplanes -->
|airfoil=
|empty weight kg=1100
|gross weight kg=1800
|max takeoff weight kg=
|max takeoff weight lb=
|max takeoff weight note=
|fuel capacity=
|more general=
<!--
        Powerplant
-->
|eng1 number=2
|eng1 name=[[Siemens Sh 14A]]
|eng1 type=7-cylinder air-cooled radial piston engines
|eng1 hp=125

|prop blade number=2
|prop name=wooden fixed-pitch propellers
|prop dia m=<!-- propeller aircraft -->
|prop dia ft=<!-- propeller aircraft -->
|prop dia in=<!-- propeller aircraft -->
|prop dia note=
<!--
        Performance
-->
|perfhide=

|max speed kmh=190
|cruise speed kmh=160
|stall speed kmh=
|stall speed mph=
|stall speed kts=
|stall speed note=
|minimum control speed kmh=
|minimum control speed mph=
|minimum control speed kts=
|minimum control speed note=
|range km=900
|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=4500
|g limits=<!-- aerobatic -->
|roll rate=<!-- aerobatic -->
|climb rate ms=
|climb rate ftmin=
|climb rate note=
|time to altitude=
|wing loading kg/m2=
|wing loading lb/sqft=
|wing loading note=
|fuel consumption kg/km=
|fuel consumption lb/mi=
|power/mass=
|more performance=
}}
<!-- ==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 -->
|lists=<!-- related lists -->
}}

==References==
{{reflist}}

==Further reading==
* {{cite book |title=The Illustrated Encyclopedia of Aircraft |publisher=Aerospace Publishing|location=London |page=2174 }}
* {{cite book |last= Taylor |first= Michael J. H. |title=Jane's Encyclopedia of Aviation |year=1989 |publisher=Studio Editions |location=London |pages=510 }}
* {{cite book |last=Nowarra |first=Heinz J. |title=Die Deutsche Luftruestung 1933-1945 Vol.4 – Flugzeugtypen MIAG-Zeppelin |year=1993 |publisher=Bernard & Graefe Verlag |location=Koblenz |isbn=3-7637-5468-7 |language=German|page=43}}

==External links==
{{Commons category|Hopfner HA.11}}
* [http://www.airwar.ru/enc/flyboat/ha1133.html Hopfner HA.11/33] Уголок неба. 2011

{{Hopfner aircraft}}
{{RLM aircraft designations}}

{{DEFAULTSORT:Hopfner HA-11 33}}
[[Category:Hopfner aircraft|HA-11 33]]
[[Category:Wiener Neustadter aircraft]]
[[Category:1930s Austrian civil utility aircraft]]
[[Category:Flying boats]]
[[Category:Amphibious aircraft]]
[[Category:High-wing aircraft]]
[[Category:Twin piston-engined tractor aircraft]]
[[Category:Aircraft first flown in 1933]]

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