Hirth F-23

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The Hirth F-23 is a twin cylinder, horizontally-opposed, two stroke, carburetted or optionally fuel injected aircraft engine designed for use on ultralight aircraft. It is manufactured by Hirth of Germany.[1][2][3]

Development

The F-23 is intended to compete with the Script error: No such module "convert". Rotax 503 and is differentiated from the Rotax powerplant by offering a horizontally opposed cylinder layout. The F-23 uses free air cooling and piston-ported induction, with dual Bing 34mm slide or optional diaphragm type carburetors. The cylinder walls are electrochemically coated with Nikasil. Standard starting is recoil start. A belt reduction drive system, fuel injection, tuned exhaust and electric start are optional.[1][2]

The engine runs on a 50:1 pre-mix of unleaded 93 octane auto fuel and oil. Recommended time between overhauls is 1000 hours.[1][2]

The F-23 produces Script error: No such module "convert". at 6150 rpm and Script error: No such module "convert". at 5500 rpm.[1][2]

Applications

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Specifications (F-23)

Data from Recreational Power Engineering[2]

General characteristics

  • Type: Twin cylinder, two-stroke, aircraft engine
  • Bore: Script error: No such module "convert".
  • Stroke: Script error: No such module "convert".
  • Displacement: 521 cc (31.8 cu in)
  • Length: Script error: No such module "convert".
  • Width: Script error: No such module "convert".
  • Height: Script error: No such module "convert".
  • Dry weight: Script error: No such module "convert". including reduction unit, full exhaust system and electric start

Components

  • Valvetrain: piston-ported
  • Fuel system: 2 X Bing 34mm slide or optional diaphragm type carburetor or fuel injection
  • Fuel type: unleaded 93 octane auto fuel
  • Oil system: 50:1 fuel/oil premix
  • Cooling system: free air
  • Reduction gear: cog belt with 1.8:1, 2.2:1 and 2.5:1 ratios optional

Performance

  • Power output: Script error: No such module "convert". at 6150 rpm
  • Compression ratio: 9.5:1

References

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  1. ↑ a b c d Cliche, Andre: Ultralight Aircraft Shopper's Guide 8th Edition, page G-3 Cybair Limited Publishing, 2001. Template:ISBN
  2. ↑ a b c d e Script error: No such module "citation/CS1".
  3. ↑ Purdy, Don: AeroCrafter - Homebuilt Aircraft Sourcebook, page 72. BAI Communications. Template:ISBN

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External links

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