Walter Mikron
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.[1] The production is about 20-30 engines annually. (2014)
Variants
- Mikron I
Initial production engines Script error: No such module "convert".. 16 engines made in 1935.
- Mikron II
The Mikron II, released in 1936, had a bore of Script error: No such module "convert". and displacement of Script error: No such module "convert"., delivering Script error: No such module "convert". at 2,600 rpm max continuous and Script error: No such module "convert". at 2,800 rpm for short periods.[2] 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 Script error: No such module "convert"., compression ratio 6:1, it produces Script error: No such module "convert". at 2,600 rpm.[3] 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 Script error: No such module "convert". at 2,750rpm for 5 minutes, max continuous power of Script error: No such module "convert". from Script error: No such module "convert"., compression ratio 7.2:1, bore Script error: No such module "convert"., stroke Script error: No such module "convert"., dry weight Script error: No such module "convert". 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
Script error: No such module "convert". at 2,800rpm from Script error: No such module "convert"., bore Script error: No such module "convert"., stroke Script error: No such module "convert".. Version developed by Parma Technik for ULL and experimental aeroplanes.
Applications
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Specifications (Mikron II)
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Data from Jane's All the World's Aircraft 1938.[2]
General characteristics
- Type: 4-cylinder inverted air-cooled inline
- Bore: Script error: No such module "convert".
- Stroke: Script error: No such module "convert".
- Displacement: Script error: No such module "convert".
- Length: Script error: No such module "convert". with starter
- Width: Script error: No such module "convert". with fuel pump
- Height: Script error: No such module "convert". with fuel pump
- Dry weight: Script error: No such module "convert". dry
Components
- Valvetrain: One intake and one exhaust valve per cylinder operated by pushrods and rockers
- Fuel system: 1 Claudel-Hobson carburettor
- Fuel type: 73 octane gasoline
- Oil system: Pressure fed, dry sump
- Cooling system: Air-cooled
- Starter: 1x Walter mecano 4 hand starter
Performance
- Power output: Script error: No such module "convert". at 2,600 rpm continuous, Script error: No such module "convert". at 2,800 rpm maximum for short periods
- Compression ratio: 6:1
- Power-to-weight ratio: 0.8 kW/kg (0.5 hp/lb)
See also
Comparable engines
Related lists
References
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- Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. Template:ISBN