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HIRTH engine
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Hirth-F33 ES engine
The F33 ES is an air cooled, reed valve controlled 1-cylinder-2- strok...
The F33 ES is an air cooled, reed valve controlled 1-cylinder-2- stroke engine with electronic fuel and Nikasil coated cylinder.
It has one of the highest power to weight ratio available on the 30 HP engine market. Ideally suited for powered parachutes, light experimental aircrafts and ultralights, and all applications where weight is an issue.
This engine is available in several versions, an overview is given in the Hirth-information 0069.
Factory recommended TBO is rated at 1000 hours at 75% power. The warranty of the crank shaft is 3 years.

Technical data

Subject to technical changes

Type

Single cylinder two stroke

Displacement

313 cm3 (19.1cu in)

Stroke

69 mm (2.72 in)

Bore

76 mm (2.99 in)

Max. performance

20.6 kW (28 HP) at 6200 rpm 

According to DIN 70020


Max. torque

31.8Nm (23.4 ft.lb) at 5800 rpm

Carburation

single point injection

Ignition System

CDI

Cooling

Propeller / air stream 

Weight

12.7 kg (28 lb)

Starting device

Recoil starter

Running direction

Counter-clockwise, view to output shaft

Fuel mixture

Mixture 1:50, 2-stroke-oil, fuel min. 95 octane (RON)Mixture 1:80-100 with BLUEMAX 2-stroke-oil, fuel min. 95 octane

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