The Hirth F-36 is a single cylinder, two stroke, carburetted aircraft engine designed for use on ultralight aircraft, especially powered paragliders and very light ultralight trikes. The F-36 was formerly known as the Solo 210, before the design was purchased by Hirth. It is noted for its extremely light equipped weight of 28 lb (13 kg) including exhaust system, reduction drive and carburetor. Unit cost in 2009 was US$1819.

The engine uses free air cooling, single capacitor discharge ignition, with a single integral pump-type carburetor. The cylinder walls are electrochemically coated with Nikasil. Standard starting is recoil start with electric start optional. A quadruple V belt reduction drive system is an option with ratios of 1.8:1, 2.0:1 or 2.5:1.

The engine runs on a 50:1 pre-mix of unleaded 93 octane auto fuel and oil and produces 15 hp (11 kW) at 6000 rpm.

Applications:
Adventure F series
Air Est JCD 03 Pelican
Delta Sailplane Nomad
Fly Products Power
Fresh Breeze Solo
Hang Buggy ultralight trike
Paramotor Inc FX1
Rotec Rally 2
Spartan BP Parawing
Southern Skies Spymotor
UFM Easy Riser

Specifications:

Solo 210
Cycle: 2 stroke
No cylinders: 1
Bore: 70 mm
Stroke: 35 mm
Displacement: 210 cc
Cooling: air
Ignition: electronic
Reduction: Poly-v 1.75/1 – 3/1
Dimension: 260 x 320 x 210 mm
Weight: 12 kg
Max pwr: 14 hp at 6500 rpm
Fuel consumption: 350 G/hp/hr

F-36
Type: Single cylinder, two-stroke, aircraft engine
Bore: 70 mm (2.8 in)
Stroke: 54 mm (2.1 in)
Displacement: 208 cc (12.7 cu in)
Length: 275 mm (10.8 in)
Width: 359 mm (14.1 in)
Height: 341 mm (13.4 in)
Dry weight: 28 lb (12.7 kg) with reduction drive, exhaust system and recoil start
Fuel system: 1 X integral pumper carburetor
Fuel type: Minimum of unleaded 93 octane auto fuel
Oil system: 50:1 fuel/oil premix
Cooling system: free air
Reduction gear: four element cog belt with ratios of 1.8:1, 2.0:1 or 2.5:1 available
Power output: 15 hp (11 kW) at 6000 rpm
Compression ratio: 10.6:1

Hirth F33
Cycle: 2 stroke
No cylinders: 1
Bore: 69 mm
Stroke: 76 mm
Compression: 9.3
Displacement: 313 cc
Cooling: Air
Ignition: Electronic
Reduction: Belt 1.8/1, 2.2/1, 2.5/1
Dimension: 260 x 410 x 300
Weight: 12 kg
Max pwr: 25 hp at 4700 rpm

The Hirth F-30 is a horizontally opposed four-cylinder, two-stroke, carburetted aircraft engine, with optional fuel injection, designed for use on ultralight aircraft and homebuilts.

The F-30 is equipped with dual capacitor discharge ignition and is free air-cooled, with optional fan cooling. The cylinder walls are electrochemically coated with Nikasil. Standard starting is electric start and recoil start is not an option. The reduction drive system available is the G-40 gearbox with optional reduction ratios of 2.03:1, 2.25:1, 2.64:1, 2.96:1 and 3.33:1. A centrifugal clutch is also available as optional equipment.

The engine runs on a 50:1 pre-mix of unleaded 93 octane auto fuel and oil.

Variants:

F-30
Four-cylinder horizontally opposed, two-stroke, aircraft engine with a dual 38 mm diaphragm carburetors. Produces 85 hp (63 kW) at 5500 rpm if free-air-cooled or 80 hp (60 kW) at 5500 rpm if fan cooled. It has a factory rated TBO of 1200 hours.

F-30E
Four-cylinder horizontally opposed, two-stroke, aircraft engine with fuel injection. Produces 90 hp (67 kW) at 5500 rpm if free-air-cooled or 85 hp (63 kW) at 5500 rpm if fan cooled. It has a factory rated TBO of 1200 hours.

F-30S
Four-cylinder horizontally opposed, two-stroke, aircraft engine with dual integral pumper carburetors. Produces 100 hp (75 kW) at 6200 rpm if free-air-cooled or 95 hp (71 kW) at 6200 rpm if fan cooled. It has a factory rated TBO of 1000 hours.

F-30ES
Four-cylinder horizontally opposed, two-stroke, aircraft engine with fuel injection. Produces 110 hp (82 kW) at 6200 rpm if free-air-cooled or 105 hp (78 kW) at 6200 rpm if fan cooled. It has a factory rated TBO of 1000 hours.

Applications:
Acrolite
Aeros UL-2000 Flamingo
Airdrome Fokker D-VII
Airdrome Nieuport 24
Aviastroitel AC-7M
Denney Kitfox
DF Helicopters DF334
Falconar F11 Sporty
Howland H-2 Honey Bee
Kolb Mark III
Paladin Hercules
Peak Aerospace Me 109
Rans S-12
Titan Tornado

Specifications:

F30
Cycle: 2 stroke
No cylinders: 4 opposed
Bore: 72 mm
Stroke: 64 mm
Compression: 9.5
Displacement: 1024 cc
Cooling: Air
Ignition: 4CDI
Reduction: mechanical gear 2.03/1 to 2.96/1
Weight: 48 kg
Max pwr: 95 hp at 5270 rpm

F-30ES
Type: Four-cylinder, two-stroke, horizontally opposed, aircraft engine
Bore: 72 mm (2.8 in)
Stroke: 64 mm (2.5 in)
Displacement: 1042 cc (63.6 cu in)
Length: 380 mm (15.0 in)
Width: 660 mm (26.0 in)
Height: 355 mm (14.0 in)
Dry weight: 105 lb (47.6 kg), including starter and exhaust system, 129 lb (58.5 kg) with gearbox, exhaust system and electric start. Fan cooling adds 8.5 lb (3.9 kg)
Fuel system: Fuel injection
Fuel type: unleaded 93 octane auto fuel
Oil system: 50:1 fuel/oil premix or oil injection
Cooling system: free air or fan
Reduction gear: G-40 gearbox with reduction ratios of 2.03:1, 2.25:1, 2.64:1, 2.96:1 and 3.33:1 available. Optional centrifugal clutch.
Power output: 110 hp (82 kW) at 6200 rpm with free-air cooling, 105 hp (78 kW) at 6200 rpm with fan cooling
Compression ratio: 9.5:1

The Hirth F-23 is a twin cylinder, horizontally-opposed, two stroke, carburetted or optionally fuel injected aircraft engine designed for use on ultralight aircraft. The base price in 2009 was US$4423.

The F-23 is intended to compete with the 50 hp (37 kW) Rotax 503 and is differentiated from the Rotax powerplant by offering a horizontally-opposed cylinder layout. The F-23 uses free air cooling and piston-ported induction, with dual Bing 34mm slide or optional diaphragm type carburetors. The cylinder walls are electrochemically coated with Nikasil. Standard starting is recoil start. A belt reduction drive system, fuel injection, tuned exhaust and electric start are optional.

The engine runs on a 50:1 pre-mix of unleaded 93 octane auto fuel and oil. Recommended time between overhauls is 1000 hours.

The F-23 produces 50 hp (37 kW) at 6150 rpm and 40 hp (30 kW) at 5500 rpm.

Applications:
Air Sports AIRector 120
Aurore MB 02-2 Mini Bulle
DAR-23
Fisher FP-303
Monnett Moni – motorglider
Sadler Vampire
Spacek SD-1 Minisport
TechProAviation Merlin 100
Team Mini-Max AeroMax
TeST TST-1 Alpin
Wings of Freedom Phoenix 103

Specifications:
F-23
Type: Twin cylinder, two-stroke, aircraft engine
Bore: 72 mm (2.8 in)
Stroke: 64 mm (2.5 in)
Displacement: 521 cc (31.8 cu in)
Length: 247 mm (9.7 in)
Width: 570 mm (22.4 in)
Height: 338 mm (13.3 in)
Dry weight: 84 lb (38.1 kg) including reduction unit, full exhaust system and electric start
Valvetrain: piston-ported
Fuel system: 2 X Bing 34mm slide or optional diaphragm type carburetor or fuel injection
Fuel type: unleaded 93 octane auto fuel
Oil system: 50:1 fuel/oil premix
Cooling system: free air
Reduction gear: cog belt with 1.8:1, 2.2:1 and 2.5:1 ratios optional
Power output: 50 hp (37 kW) at 6150 rpm
Compression ratio: 9.5:1