| 词条 | Walter Mikron | ||||||||||||||||||
| 释义 |
The Walter Mikron is a four-cylinder, air-cooled, inverted straight engine for aircraft. DevelopmentDeveloped 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
Initial production engines producing {{convert|50|hp|kW|abbr=on|disp=flip}}. 16 engines produced in 1935.
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.[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.
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.[3] Introduced in 1945, 103 engines made between 1948-1950. The engines were used on Praga E-114 Air Baby.
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.
Engines produced by Aerotechnik in 1980s-90s. Updated cylinder head with one more cooling rib, updated connecting rod lower end, otherwise identical with IIIS.
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.
Engines equipped with electric starter and alternator.
Version developed by Parma Technik for ULL and experimental aeroplanes. Applications{{columns-list|colwidth=22em|
}} Specifications (Mikron II){{pistonspecs| |ref=Jane's All the World's Aircraft 1938[2] |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= }} GallerySee also{{aircontent|see also=
|related= |similar aircraft= |lists=
|similar engines=
}} References1. ^{{cite web|url=http://www.parmatechnik.cz/english/index.htm|title=Parma Technik|accessdate=6 August 2011}} 2. ^1 {{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 }} 3. ^Gunston 1989, p.174.
External links{{commons category}}
4 : Air-cooled aircraft piston engines|Aircraft piston engines 1930–1939|Inverted aircraft piston engines|Walter aircraft engines |
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