| 词条 | Hirth 2704 | ||||||||||||||
| 释义 |
The Hirth 2704 and 2706 are a family of in-line twin cylinder, two stroke, carburetted aircraft engines, with optional fuel injection, designed for use on ultralight aircraft and especially two seat ultralight trainers, single seat gyrocopters and small homebuilts.[1][2][3][4] The series is out of production and were replaced by the Hirth 3202 and 3203 in May 2002.[5] DevelopmentThe 2706 was developed as a competitor to the {{convert|64|hp|kW|0|abbr=on}} Rotax 582 and is similar to the Rotax powerplant in being a two-cylinder in-line engine, with dual capacitor discharge ignition, although it is air-cooled, compared to the 582's liquid cooling. The 2704 was developed from the 2706 as a de-rated version to compete with the {{convert|50|hp|kW|0|abbr=on}} Rotax 503.[1][2][3] Both the 2704 and 2706 use free air or fan cooling, with dual Bing 34mm slide carburetors or optionally fuel injection. The cylinder walls are electrochemically coated with Nikasil. Standard starting is recoil start with electric start as an option. The reduction drive system available is the G-50 gearbox, with reduction ratios of 2.16:1, 2.29:1, 2.59:1, 3.16:1, or 3.65:1.[1][2][3] The engines run on a 50:1 pre-mix of unleaded 93 octane auto fuel and oil, or optionally 100:1 oil injection.[1][2][3] Variants
Twin-cylinder in-line, two stroke, aircraft engine with a single or dual Bing 34mm slide carburetor or fuel injection. Produces {{convert|53|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 Bing 34mm slide carburetor or fuel injection. Produces {{convert|65|hp|kW|0|abbr=on}} at 6200 rpm and has a factory rated TBO of 1000 hours. The 2706 was replaced in production in May 2002 by the Hirth 3203.[1][3][4] Applications
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}} Specifications (2704){{pistonspecs||ref=Recreational Power Engineering[2] |type=Twin cylinder, two-stroke, in-line, aircraft engine |bore={{convert|76|mm|in|1|abbr=on}} |stroke={{convert|69|mm|in|1|abbr=on}} |displacement=625 cc (38.1 cu in) |length={{convert|377|mm|in|1|abbr=on}} |diameter= |width={{convert|450|mm|in|1|abbr=on}} |height={{convert|383|mm|in|1|abbr=on}} |weight={{convert|73|lb|kg|1|abbr=on}} with free air cooling, {{convert|79|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=2 X Bing 34mm slide type carburetor |fueltype=unleaded 93 octane auto fuel |oilsystem=50:1 fuel/oil premix or oil injection |coolingsystem=free air or fan |power={{convert|53|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 |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, pages G-3 and G-4 Cybair Limited Publishing, 2001. {{ISBN|0-9680628-1-4}} 2. ^1 2 3 4 5 {{cite web|url = http://www.recpower.com/2704.htm|title = 2704 2 cycle 53hp |accessdate = 2009-12-17|last = Recreational Power Engineering |authorlink = |year = n.d. |archiveurl = https://web.archive.org/web/20050205211815/http://www.recpower.com/2704.htm |archivedate = 5 February 2005}} 3. ^1 2 3 4 {{cite web|url = http://www.recpower.com/2706.htm|title = 2706 2 cycle 65hp |accessdate = 2009-12-17|last = Recreational Power Engineering |authorlink = |year = n.d. |archiveurl = https://web.archive.org/web/20070713210735/http://www.recpower.com/2706.htm |archivedate = 13 July 2007}} 4. ^1 2 Purdy, Don: AeroCrafter - Homebuilt Aircraft Sourcebook, page 72. BAI Communications. {{ISBN|0-9636409-4-1}} 5. ^{{cite web|url=http://www.recpower.com/hirth.htm |title=Hirth Engines|publisher=Recreational Power Engineering |date= |accessdate=2013-01-17}} External links
3 : Hirth aircraft engines|Air-cooled aircraft piston engines|Two-stroke aircraft piston engines |
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