Hirth 3701

Hirth 3701
Type Three-cylinder two-stroke aircraft engine
National origin Germany
Manufacturer Hirth
Unit cost US$9815 (base price 2009)

The Hirth 3701 is an in-line three-cylinder, two-stroke, carburetted aircraft engine, with optional fuel injection, designed for use on ultralight aircraft and small homebuilts.[1][2]

Development

The 3701 was developed as a liquid-cooled and narrower installation alternative to the four-cylinder Hirth F-30 air-cooled engine of 85 to 110 hp (63 to 82 kW).[1][2]

The 3701 features triple Bing 34 mm slide carburetors or optionally fuel injection. The cylinder walls are electrochemically coated with Nikasil. Standard starting is electric start and recoil start is not available 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]

The engine runs on a 50:1 pre-mix of unleaded 93 octane auto fuel and oil, or optionally 100:1 oil injection.[1]

Variants

3701 high-torque/low-rpm engine
Three-cylinder in-line, two-stroke aircraft engine with three Bing 34 mm slide carburetors or fuel injection. Low piston port timing produces 84 hp (63 kW) at 4950 rpm with a very flat torque curve.[1]
3701 high performance engine
Three-cylinder in-line, two stroke aircraft engine with three Bing 34 mm slide carburetors or fuel injection. High piston port timing produces 100 hp (75 kW) at 6000 rpm with a steep torque curve.[1]

Applications

Specifications (3701 high performance)

Data from Recreational Power Engineering[1]

General characteristics

Components

Performance

See also


References

  1. 1 2 3 4 5 6 7 Recreational Power Engineering (n.d.). "3701S - 2 cycle 100hp". Archived from the original on 4 October 2013. Retrieved 18 December 2009.
  2. 1 2 Ultraligero.Net (n.d.). "3701 - 2 cycle - 100hp". Retrieved 18 December 2009.
  3. Von Koschier, Angelo (November 2003). "Helicycle". Retrieved 18 December 2009.

External links

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