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HIRTH engine
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Hirth-F33A/AS engine
The F33 A/AS is an air cooled, reed valve controlled 1-cylinder-2- str...
The F33 A/AS is an air cooled, reed valve controlled 1-cylinder-2- stroke engine with slide carburetor 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

18.1 kW (24.6 HP) at 6000 rpm (A)

According to DIN 70020

20.6kW (28HP) at 6500 rpm (AS)

Max. torque

31.1 Nm (22.9 ft.lb) at 4800 rpm (A)

33.7 Nm (24.3 ft.lb) at 5500 rpm (AS)

Carburation

slide carburetor 

Ignition System

CDI

Cooling

Propeller / free air

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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