F33 Hirth Engine Manual


F-33 2 cycle 28hp

Hirth Aircraft Engines. F-33 2 cycle 28hp F-23 2 cycle 50hp F-23 2 cycle 50hp View more detailed information. F-33 2 cycle 28hp. One little powerhouse of an engine. At only 35 lbs. This is one of the lightest singles you'll find anywhere. Of torque, this engine packs enough punch to spin up the large props on your backpack.

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 large props on your backpack parachute, tryke 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 optional 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 and adds 2 pounds to total weight. Engine pictured above is equipped with the forward style mount, electric start, and belt drive mounted in the hanging position.

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$3664.00

$4264.00

$4556.00

The F33's are some of the lightest single cylinder engines you'll find anywhere

F-33
2 cycle, single cylinder
76mm
69mm
313cc
9.5:1
28hp @ 6500rpm
25ft.lbs @ 6000rpm
Dual CDI
Single 34mm slide or optional diaphragm type
Auxiliary external pneumatic (12VDC electric pump when fuel injected)
Fuel mixed with oil @ 50:1
Counter clockwise, viewed from output end
Recoil or optional electric start - Note: Electric start only available in conjunction with belt re-drive
Free air Cooled by prop or slip stream (Optional fan cooling available on special order)
35lbs including exhaust sys. - 40lbs W/re-drive - 45lbs W/elec. start
4V belt drive available 1.8:1, 2.2:1, & 2.5:1 ratios.(Up or down pos.)
Optional centrifugal clutch available (can not be used with belt drive)

Engine Print


Customer Photo Gallery


F33 installed in Earthstar Thundergull


F33 installed in Ison Air Nison Easy
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Twin F33's installed in Para Ski PPC
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F-33 on Backpack PPC
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F-33 installed in Skymaster PPC
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F-33 installed in Para Ski PPC
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F-33 installed in Trikasoarus
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F-33 installed in Trikasoarus
Rear ViewTop View
Side View

F-33 installed in Challenger 103 Ultralight
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Top ViewLeft Side
Right Side


F-33 on BE-LITE
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