WSK WN-3

In 1946, Wiktor Narkiewicz, who prior to the Second World War was technical director of the Czechoslovakian Avia aero-engine factory, was appointed chief designer of the Polish Central Engine Office, and later the Aero-engine department of the Polish Aviation Institute (Instytut Lotnictwa, IL). He led the design of the WN-1, a {{convert|65|hp|kW|abbr=on|disp=flip}} air-cooled flat-four piston engine which was the first post-war Polish aero-engine, followed by the {{convert|285|hp|kW|abbr=on|disp=flip}} WN-2 in 1947, but both of these engines failed to enter production.Flight 26 July 1957, p. 127.

In 1952 Narkiewicz set up a small design team to design a new seven-cylinder radial engine, the WN-3. The first prototype, rated at {{convert|300|hp|kW|abbr=on|disp=flip}} was completed in 1954, and by the time testing was completed in 1955, the engine's power rose to {{convert|330|hp|kW|abbr=on|disp=flip}}. The WN-3 entered production in 1956,Cynk Flight International 4 January 1962, p. 17. powering the PZL TS-8 Bies training aircraft.

The engine was produced in 1957-1960 by WSK-Kalisz in Kalisz,{{cite book |last1=Babiejczuk |first1=Janusz |last2=Grzegorzewski |first2=Jerzy|date= 1974|title=Polski przemysł lotniczy 1945–1973 |language= pl|location=Warsaw |publisher= Wydawnictwo MON|pages=145, 149–151}} it might be known also as PZL WN-3, or (in Western sources) as Narkiewicz WN-3.

;WN-3

:Production version, {{convert|330|hp|kW|abbr=on|disp=flip}}.

;WN-4

:Modified version for use in helicopters.

File:TS-8 Bies Warszawa 2011 01.jpg]]

• PZL TS-8 BiesTaylor 1961, pp. 121–122.
• PZL MD-12 (prototype)Taylor 1961, pp. 118–119.
• BŻ-4 Żuk (prototype)

{{pistonspecs|

|ref=Jane's All The World's Aircraft 1961–62Taylor 1961, pp. 457–458.

|type=Seven-cylinder single-row air-cooled radial engine

|bore={{convert|135|mm|in|2|abbr=on}}

|stroke={{convert|134|mm|in|2|abbr=on}}

|displacement={{convert|13.4|L|cuin|abbr=on}}

|length={{convert|885|mm|in|1|abbr=on}}

|diameter={{convert|1106|mm|in|1|abbr=on}}

|width=

|height=

|weight={{convert|240|kg|abbr=on}} dry

|valvetrain=one inlet and one outlet valve per cylinder, pushrod actuated

|supercharger=

|turbocharger=

|fuelsystem=K-14WN carburettor

|fueltype=petrol, 72 octane or more

|oilsystem=Dry sump

|coolingsystem=

|power={{convert|330|hp|kW|abbr=on|disp=flip}} at 2,500 rpm (max power)

::{{convert|283|hp|kW|abbr=on|disp=flip}} (nominal)

::{{convert|240|hp|kW|abbr=on|disp=flip}} at 2,100 rpm (econ cruise)

|specpower={{cvt|18.4|kW/L|hp/cuin}}

|compression=6.2:1

|fuelcon=

|specfuelcon={{cvt|.186|–|.201|kg/kWh}} at max power
{{cvt|.160|kg/kWh}} (econ cruise)

|oilcon=

|power/weight=

|designer=

|reduction_gear=

|general_other=

|components_other=

|performance_other=

}}

{{commons category|Narkiewicz WN-3}}

{{Reflist}}

• {{cite magazine|title=Aero Engines 1957|magazine=Flight|date=26 July 1957|volume= 72|issue= 2531|pages=127|url=https://www.flightglobal.com/pdfarchive/view/1957/1957%20-%201037.html}}
• {{cite magazine|last=Cynk|first=Jerzy B.|title=Progress in Poland|magazine=Flight International|date=4 January 1962|volume= 81|issue= 2756|pages=14–17|url=http://www.flightglobal.com/pdfarchive/view/1962/1962%20-%200014.html}}
• {{cite book|last=Taylor|first=John W. R.|title=Jane's All The World's Aircraft 1961–62|year=1961|publisher=Sampson Low, Marston & Company, Ltd|location=London|author-link=John W. R. Taylor}}
• {{cite book |last1=Babiejczuk |first1=Janusz |last2=Grzegorzewski |first2=Jerzy|date= 1974|title=Polski przemysł lotniczy 1945–1973 |trans-title= Polish aviation industry 1945-1973|language= pl|location=Warsaw |publisher= Wydawnictwo MON|pages=145, 149–151}}

Category:1950s aircraft piston engines

Category:Aircraft air-cooled radial piston engines