Walter Mikron#Mikron IIIS

{{Infobox Aircraft Begin

|name= Mikron

|image = Walter Mikron III 2.jpg

|caption = Walter Mikron III

}}

{{Infobox Aircraft Engine

|type= Inline piston engine

|national origin = Czechoslovakia

|manufacturer= Walter Aircraft Engines / Parma Technik

|first run=1938

|major applications=

|number built =

|program cost =

|unit cost =

|developed from =

|developed into =

|variants with their own articles =

}}

The Walter Mikron is a four-cylinder, air-cooled, inverted straight engine for aircraft.

Development

Developed in Czechoslovakia in the early 1930s, the engine saw limited use in late 1930s and early 1950s. In the 1980s an initial batch of engines was rebuilt by Aerotechnik Moravska Trebova for use on L-13 Vivat motorgliders. Production of new engines followed. The company Aerotechnik was later bought by Parma Technik and production resumed in 1999, under a new name, in the same factory. The engine is mostly used on ultralight, LSA and experimental aircraft.{{cite web|url=http://www.parmatechnik.cz/english/index.htm|title=Parma Technik|access-date=6 August 2011}}

The production is about 20-30 engines annually. (2014)

Variants

;Mikron I

Initial production engines {{convert|50|hp|kW|abbr=on|disp=flip}}.

16 engines made in 1935.

;Mikron II

The Mikron II, released in 1936, had a bore of {{convert|88|mm|in|abbr=on|2}} and displacement of {{convert|2.336|L|cuin|abbr=on|2}}, delivering {{convert|60|hp|kW|abbr=on|disp=flip}} at 2,600 rpm max continuous and {{convert|62|hp|kW|abbr=on|disp=flip}} at 2,800 rpm for short periods.{{cite book |last=Grey |first=C.G. |title=Jane's All the World's Aircraft 1938 |year=1938 |publisher=Sampson Low, Marston & company, ltd |location=London |author2=Bridgman, Leonard }} After a hiatus in production during the Second World War, production resumed till 1948, when the Micron III went into production. In total 421 Mikron II engines were produced.

;Mikron III

With a displacement of {{convert|2.44|L|cuin|abbr=on|2}}, compression ratio 6:1, it produces {{convert|48.5|kW|hp|abbr=on}} at 2,600 rpm.Gunston 1989, p.174.

Introduced in 1945, 103 engines made between 1948-1950. The engines were used on Praga E-114 Air Baby.

;Mikron IIIS

In 1980s company Aerotechnik in Moravska Trebova had collected 56 engines of the post war production.

The engines have been rebuilt, new pistons and carburetor JIKOV SOP 40L installed.

Used on L-13 Vivat motorgliders.

;Mikron IIIA

Engines produced by Aerotechnik in 1980s-90s. Updated cylinder head with one more cooling rib, updated connecting rod lower end, otherwise identical with IIIS.

;Mikron IIIB

Improved version of the Mikron IIIA {{convert|75|hp|kW|abbr=on|disp=flip}} at 2,750rpm for 5 minutes, max continuous power of {{convert|69|hp|kW|abbr=on|disp=flip}} from {{convert|2.44|L|cuin|abbr=on|2}}, compression ratio 7.2:1, bore {{convert|90|mm|in|abbr=on|2}}, stroke {{convert|96|mm|in|abbr=on|2}}, dry weight {{convert|69|kg|lb|abbr=on|2}}

Almost identical with IIIA except the compression ratio. The engine initially used lowered A heads. After some problems with cracking, new B heads were developed by Parma Technik.

;Mikron M IIISE, AE, BE

Engines equipped with electric starter and alternator.

;Mikron IIIC

{{convert|80|hp|kW|abbr=on|disp=flip}} at 2,800rpm from {{convert|2.7|L|cuin|abbr=on|2}}, bore {{convert|93.3|mm|in|abbr=on|2}}, stroke {{convert|96|mm|in|abbr=on|2}}.

Version developed by Parma Technik for ULL and experimental aeroplanes.

Applications

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Specifications (Mikron II)

thumb

{{pistonspecs

|

|ref=Jane's All the World's Aircraft 1938.

|type=4-cylinder inverted air-cooled inline

|bore={{convert|88|mm|in|abbr=on|2}}

|stroke={{convert|96|mm|in|abbr=on|2}}

|displacement={{convert|2.336|L|cuin|abbr=on|1}}

|length={{convert|804|mm|in|abbr=on|2}} with starter

|diameter=

|width={{convert|342|mm|in|abbr=on|2}} with fuel pump

|height={{convert|635|mm|in|abbr=on|2}} with fuel pump

|weight={{convert|61|kg|lb|abbr=on|2}} dry

|valvetrain=One intake and one exhaust valve per cylinder operated by pushrods and rockers

|supercharger=

|turbocharger=

|fuelsystem=1 Claudel-Hobson carburettor

|fueltype=73 octane gasoline

|oilsystem=Pressure fed, dry sump

|coolingsystem=Air-cooled

|power= {{convert|60|hp|kW|abbr=on|disp=flip}} at 2,600 rpm continuous, {{convert|62|hp|kW|abbr=on|disp=flip}} at 2,800 rpm maximum for short periods

|specpower=

|compression=6:1

|fuelcon=

|specfuelcon=

|oilcon=

|power/weight= 0.8 kW/kg (0.5 hp/lb)

|designer=

|reduction_gear=

|general_other=

|components_other=Starter: 1x Walter mecano 4 hand starter

|performance_other=

}}

References

Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. {{ISBN|1-85260-163-9}}

External links

[http://www.oldengine.org/members/diesel/Duxford/czechaer1.htm Oldengine.org]

Category:Aircraft air-cooled inline piston engines

Category:1930s aircraft piston engines

Category:Inverted aircraft piston engines

Mikron