Hirth, Hirth F-33, Hirth F 33 2 cycle 28hp ultralight aircraft engine.

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Hirth F-33 2 cycle 28hp

Hirth F -33 single cylinder 28 hp aircraft engine.

 

One little powerhouse of an engine. At only 35 lbs. this is one of the lightest singles you'll find anywhere. With 25ft. lbs. of torque, this engine packs enough punch to spin up the largest of props on your Backpack parachute or legal 103 ultralight.

Factory recommended TBO is rated at 1000 Hrs. @ 75% power. Standard equipment includes fuel pump, spark plugs, air filter, recoil starter, complete exhaust system and dual CDI ignition for added reliability.

When ordered with optional electric start the starter solenoid and voltage rectifier/regulator are included.

Standard mounting is plate type from bottom of engine. An optionalHirth F 33 performance graph. crankcase allows 4 point mounting (firewall forward style) from the ignition side of the case instead of from the bottom of case.
This option must be special ordered.

Model:

 F-33

Carburation:

 Single 34mm slide or optional diaphragm type.

Engine Type:

 2 cycle, single cylinder

Fuel Pump:

 Auxiliary external pneumatic

Bore:

 76mm

Lubrication:

 Fuel mixed with oil @ 50:1

Stroke:

 69mm

Rotation:

 Counter clockwise, viewed from output end

Displacement:

 313cc

Starter:

 Recoil or optional electric start - Note: Electric start only available in conjunction with belt re-drive

Compression:

 9.5:1

Cooling:

 Free air Cooled by prop or slip stream

HP

 28hp @ 6000rpm

Weight:

 35lbs including exhaust sys. - 42lbs W/re-drive - 48lbs W/elec. start

Torque:

 25ft.lbs @ 5800rpm

Reduction Sys.:

 4V belt drive available 1.8:1, 2.2:1, & 2.5:1 ratios.(Up or down pos.)

Ignition:

 Dual CDI Drive Coupling Optional centrifugal clutch available
(can not be used with belt drive)

Recreational Power Engineering 5479 E. Co. Rd. 38, Tiffin, Ohio 44883
419-585-7002

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