| 词条 | Hirth 2702 | ||||||||||||||
| 释义 |
The Hirth 2702 and 2703 are a family of in-line twin cylinder, two stroke, carburetted aircraft engines designed for use on ultralight aircraft and especially two seat ultralight trainers, single seat gyrocopters, and small homebuilts.[1][2][3][4] DevelopmentThe 2703 was developed as a competitor to the {{convert|50|hp|kW|0|abbr=on}} Rotax 503 and is similar to the Rotax powerplant in being a two-cylinder in-line engine, with dual capacitor discharge ignition. The 2702 was developed from the 2703 as a de-rated version.[1][2][2] Both the 2702 and 2703 use free air or fan cooling, with Bing 34mm slide carburetors. The cylinder walls are electrochemically coated with Nikasil. Standard starting is recoil start. Reduction drive systems available are the G-50 gearbox with reduction ratios of 2.16:1, 2.29:1, 2.59:1, 3.16:1, or 3.65:1, or a multi-element cog belt drive. A tuned exhaust and electric start are optional.[1][2][3] The engines runs on a 50:1 pre-mix of unleaded 93 octane auto fuel and oil.[1][2][3] Variants
Twin-cylinder in-line, two stroke, aircraft engine with a single Bing 34mm slide carburetor. Produces {{convert|40|hp|kW|0|abbr=on}} at 5500 rpm and has a factory rated TBO of 1200 hours. Still in production.[2][4]
Twin-cylinder in-line, two stroke, aircraft engine with dual or optionally a single Bing 34mm slide carburetor. Produces {{convert|55|hp|kW|0|abbr=on}} at 6200 rpm and has a factory rated TBO of 1000 hours. The 2703 has been largely supplanted in production by the Hirth 3202, but in 2009 was still available as a special order from the factory.[1][3][4] Applications
Specifications (2702){{pistonspecs||ref=Recreational Power Engineering[2] |type=Twin cylinder, two-stroke, in-line, aircraft engine |bore={{convert|72|mm|in|1|abbr=on}} |stroke={{convert|64|mm|in|1|abbr=on}} |displacement=521 cc (31.8 cu in) |length={{convert|413|mm|in|1|abbr=on}} |diameter= |width={{convert|450|mm|in|1|abbr=on}} |height={{convert|376|mm|in|1|abbr=on}} |weight={{convert|70|lb|kg|1|abbr=on}} with free air cooling, {{convert|76|lb|kg|1|abbr=on}} with fan cooling, including recoil starter and exhaust. G-50 gearbox adds an additional {{convert|19|lb|kg|1|abbr=on}} |valvetrain= |supercharger= |turbocharger= |fuelsystem=1 X Bing 34mm slide type carburetor |fueltype=unleaded 93 octane auto fuel |oilsystem=50:1 fuel/oil premix |coolingsystem=free air or fan |power={{convert|40|hp|kW|0|abbr=on}} at 5500 rpm |specpower= |compression=9.5:1 |fuelcon= |specfuelcon= |oilcon= |power/weight= |designer= |reduction_gear= G-50 gearbox with reduction ratios of 2.16:1, 2.29:1, 2.59:1, 3.16:1, or 3.65:1, or a multi-element cog belt drive |general_other= |components_other= |performance_other= }} See also{{aircontent|see also=
|related= |similar aircraft= |lists= }} References1. ^1 2 3 4 Cliche, Andre: Ultralight Aircraft Shopper's Guide 8th Edition, page G-3 Cybair Limited Publishing, 2001. {{ISBN|0-9680628-1-4}} 2. ^1 2 3 4 5 6 {{cite web|url = http://www.recpower.com/2702.htm|title = 2702 2 cycle 40hp |accessdate = 2009-12-17|last = Recreational Power Engineering |authorlink = |year = n.d.}} 3. ^1 2 3 {{cite web|url = http://www.recpower.com/2702%202%20cycle%2040hp.htm|title = 2703 2 cycle 55hp |accessdate = 17 January 2013|last = Recreational Power Engineering |authorlink = |year = n.d. |archiveurl = https://web.archive.org/web/20100302191141/http://www.recpower.com/2703.htm |archivedate = 2 March 2010}} 4. ^1 2 Purdy, Don: AeroCrafter - Homebuilt Aircraft Sourcebook, page 72. BAI Communications. {{ISBN|0-9636409-4-1}} External links
3 : Hirth aircraft engines|Air-cooled aircraft piston engines|Two-stroke aircraft piston engines |
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