Motor F 33 B/BS
Engine: F 33 B/BS


Type: one-cylinder engine with diaphragm carburetter

Cylinder: 1

Displacement: 313 cm³

Max. performance: 18,1 kW (24,6 HP) [B] / 20,6 kW (28 HP) [BS]

Max. torque: 29,3 Nm [B] / 32,3 Nm [BS]

Cooling: Free air

Weight: 12,7 kg

Starting device: recoil starter included

Options: electric starter (only in combination with belt reduction G33/G36) [+1,95kg], belt reduction G33/G36 [+2,3kg], dual ignition, cylinder head Maximo [+1,65kg], control rectifier [+0,15kg], firewall mounting [+0,89kg]

The F33 B/BS is an air cooled, reed valve controlled 1-cylinder-2-stroke engine with diaphragm 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 0069/1N.
Factory recommended TBO is rated at 1000 hours at 75 % power. The warranty of the crank shaft is 3 years.