Hirth F-30 Explained

The Hirth F-30 is a horizontally opposed four-cylinder, two-stroke, carburetted aircraft engine, with optional fuel injection, designed for use on ultralight aircraft and homebuilts. It is manufactured by Hirth of Germany.[1] [2] [3] [4]

Development

The F-30 is equipped with a dual capacitor discharge ignition system and is free-air-cooled, with optional fan cooling. The cylinder walls are electrochemically coated with Nikasil. Standard starting is electric start and recoil start is not an option. The reduction drive system available is the G-40 gearbox with optional reduction ratios of 2.03:1, 2.25:1, 2.64:1, 2.96:1 and 3.33:1. A centrifugal clutch is also available as optional equipment.

The engine runs on a 50:1 pre-mix of unleaded 93 octane auto fuel and oil.

Variants

F-30
  • Four-cylinder horizontally opposed, two-stroke, aircraft engine with a dual 38 mm diaphragm carburetors. Produces 850NaN0 at 5,500 rpm if free-air-cooled or 800NaN0 at 5,500 rpm if fan cooled. It has a factory rated time between overhaul (TBO) of 1,200 hours. Currently in production.
    F-30E
  • Four-cylinder horizontally opposed, two-stroke, aircraft engine with fuel injection. Produces 900NaN0 at 5,500 rpm if free-air-cooled or 850NaN0 at 5,500 rpm if fan cooled. It has a factory rated TBO of 1,200 hours. Currently in production.
    F-30S
  • Four-cylinder horizontally opposed, two-stroke, aircraft engine with dual integral pumper carburetors. Produces 1000NaN0 at 6200 rpm if free-air-cooled or 950NaN0 at 6,200 rpm if fan-cooled. It has a factory rated TBO of 1,000 hours. Currently in production.
    F-30ES
  • Four-cylinder horizontally opposed, two-stroke, aircraft engine with fuel injection. Produces 1100NaN0 at 6,200 rpm if free-air-cooled or 1050NaN0 at 6,200 rpm if fan-cooled. It has a factory rated TBO of 1,000 hours. Currently in production.

    Notes and References

    1. Cliche, Andre: Ultralight Aircraft Shopper's Guide 8th Edition, pages G-4 Cybair Limited Publishing, 2001.
    2. Web site: F-30 ES Fuel Injected ll0hp . 2009-12-18. Recreational Power Engineering . n.d. . https://web.archive.org/web/20101127174327/http://recpower.com/f302c11.htm . 27 November 2010.
    3. Web site: F-30 2 cycle 80 hp . 2009-12-18. Recreational Power Engineering . n.d. . https://web.archive.org/web/20100927180952/http://recpower.com/f308.htm . 27 September 2010.
    4. Purdy, Don: AeroCrafter - Homebuilt Aircraft Sourcebook, page 72. BAI Communications.

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