Walter Mikron

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title: "Walter Mikron" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["aircraft-air-cooled-inline-piston-engines", "1930s-aircraft-piston-engines", "inverted-aircraft-piston-engines", "walter-aircraft-engines"] description: "1930s Czech piston aircraft engine" topic_path: "general/aircraft-air-cooled-inline-piston-engines" source: "https://en.wikipedia.org/wiki/Walter_Mikron" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary 1930s Czech piston aircraft engine ::

::data[format=table title="infobox aero engine"]

Field	Value
name	Mikron
image	Walter Mikron III 2.jpg
caption	Walter Mikron III
engine_type	Inline piston engine
national_origin	Czechoslovakia
manufacturer	Walter Aircraft Engines / Parma Technik
first_run	1938
::

|name= Mikron |image = Walter Mikron III 2.jpg |caption = Walter Mikron III |engine_type= Inline piston engine |national_origin = Czechoslovakia |manufacturer= Walter Aircraft Engines / Parma Technik |first_run=1938 |major_applications= |number_built = |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. The production is about 20-30 engines annually. (2014)

Variants

;Mikron I Initial production engines 50 hp. 16 engines made in 1935.

;Mikron II The Mikron II, released in 1936, had a bore of 88 mm and displacement of 2.336 L, delivering 60 hp at 2,600 rpm max continuous and 62 hp at 2,800 rpm for short periods. 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 2.44 L, compression ratio 6:1, it produces 48.5 kW at 2,600 rpm. 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 75 hp at 2,750rpm for 5 minutes, max continuous power of 69 hp from 2.44 L, compression ratio 7.2:1, bore 90 mm, stroke 96 mm, dry weight 69 kg 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 80 hp at 2,800rpm from 2.7 L, bore 93.3 mm, stroke 96 mm. Version developed by Parma Technik for ULL and experimental aeroplanes.

Applications

• Aerolab LoCamp
• Avia BH-1 replica
• Alaparma Baldo
• Avions Fairey Belfair
• Avions Fairey Junior
• B&F Fk131 Bücker Jungmann
• Bücker Bü 180
• Chrislea Airguard
• Currie Wot
• GM&T International Pretty Flight
• Gribovsky G-10
• Gribovsky G-22
• Isaacs Fury
• Jodel D11
• Johansen CAJO 59
• Koolhoven F.K.53
• L-13 SE Vivat
• L-13 SW Vivat
• Lemberger LD20b
• Luton Major
• LWD Żak
• Praga E.114
• Podesva Trener
• RWD-16
• RWD-21
• RWD-23
• Rogožarski SIM-VI
• Rogožarski SIM-VIa
• Skandinaviska Aero BHT-1 Beauty
• Tipsy B
• Utva Trojka
• Zlín Z-XII

Specifications (Mikron II)

::figure[src="https://upload.wikimedia.org/wikipedia/commons/9/98/Walter_Mikron_II_(1936).jpg"] ::

| and start a new, fully formatted line with -- |ref=Jane's All the World's Aircraft 1938. |type=4-cylinder inverted air-cooled inline |bore=88 mm |stroke=96 mm |displacement=2.336 L |length=804 mm with starter |diameter= |width=342 mm with fuel pump |height=635 mm with fuel pump |weight=61 kg 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= 60 hp at 2,600 rpm continuous, 62 hp 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.

References

1. "Parma Technik".
2. Grey, C.G.. (1938). "Jane's All the World's Aircraft 1938". Sampson Low, Marston & company, ltd.
3. Gunston 1989, p.174.

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