Hirth 2702
German two-stroke aircraft engine
title: "Hirth 2702" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["hirth-aircraft-engines", "air-cooled-aircraft-piston-engines", "two-stroke-aircraft-piston-engines"] description: "German two-stroke aircraft engine" topic_path: "general/hirth-aircraft-engines" source: "https://en.wikipedia.org/wiki/Hirth_2702" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary German two-stroke aircraft engine ::
::data[format=table title="infobox aero engine"]
| Field | Value |
|---|---|
| name | Hirth 2702 & 2703 |
| image | Hirth 2702V.JPG |
| caption | Hirth 2702 |
| engine_type | Twin cylinder two-stroke aircraft engine |
| manufacturer | Hirth |
| national_origin | Germany |
| :: |
| name=Hirth 2702 & 2703 | image=Hirth 2702V.JPG | caption=Hirth 2702 |engine_type=Twin cylinder two-stroke aircraft engine |manufacturer=Hirth |national_origin=Germany |first_run= |major_applications= |produced= |number_built= |developed_from= |variants_with_their_own_articles=
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. It is manufactured by Hirth of Germany.
Development
The 2703 was developed as a competitor to the 50 hp 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.
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.
The engines runs on a 50:1 pre-mix of unleaded 93 octane auto fuel and oil.
Variants
;2702 :Twin-cylinder in-line, two stroke, aircraft engine with a single Bing 34mm slide carburetor. Produces 40 hp at 5500 rpm and has a factory rated TBO of 1200 hours. Still in production. ;2703 :Twin-cylinder in-line, two stroke, aircraft engine with dual or optionally a single Bing 34mm slide carburetor. Produces 55 hp 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.
Applications
;2702
- Airfer Transan
- Brutsche Freedom 40
- Flightstar
- Hy-Tek Hurricane 103
- ISON Airbike
- Preceptor N3 Pup
- Spacek SD-1 Minisport
;2703
- Airfer Transan
- Airmotive EOS 001
- American Sportscopter Ultrasport 254
- CGS Hawk
- Exkluziv Joker
- Falconar Golden Hawk
- Kolb Firestar
- RemSchetMash Robust
- US Light Aircraft Hornet
Specifications (2702)
and start a new, fully-formatted line with -- |ref=Recreational Power Engineering |type=Twin cylinder, two-stroke, in-line, aircraft engine |bore=72 mm |stroke=64 mm |displacement=521 cc (31.8 cu in) |length=413 mm |diameter= |width=450 mm |height=376 mm |weight=70 lb with free air cooling, 76 lb with fan cooling, including recoil starter and exhaust. G-50 gearbox adds an additional 19 lb |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=40 hp 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=
References
References
- Cliche, Andre: ''Ultralight Aircraft Shopper's Guide'' 8th Edition, page G-3 Cybair Limited Publishing, 2001. {{ISBN. 0-9680628-1-4
- Recreational Power Engineering. (n.d.). "2702 2 cycle 40hp".
- Recreational Power Engineering. (n.d.). "2703 2 cycle 55hp".
- Purdy, Don: ''AeroCrafter - Homebuilt Aircraft Sourcebook'', page 72. BAI Communications. {{ISBN. 0-9636409-4-1
::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::