| 23 Series |
Piston Engines; 50 hp, two-cylinder, two-stroke, air-cooled, piston engines, includes F23 Lightweight and 2302 - AVI Modern Wings Swan (Optional Hirth F23), DAR DAR-23 Duo (Hirth F23), JH Aircraft Corsair (Optional Hirth F23), RotorSchmiede VA115 (Hirth F23 RS-01), Spacek SD-1 Minisport (Hirth F23 AS (series-built aircraft)), U-Fly-It Aerolite 103 (Optional Hirth F23) |
| 27 Series |
Piston Engines; 40-55 hp, two-cylinder, two-stroke, piston engines designed for ultralight aircraft - Fisher FP-202 Koala (Optional Hirth F2702), Fisher FP-303 (Optional Hirth 2702), Spacek SD-1 Minisport (Optional Hirth 2702), U-Fly-It Aerolite 103 (Optional Hirth 2702) |
| 32 Series |
Piston Engines; 65 hp, two-cylinder, two-stroke, air-cooled, engines for light aviation, hovercraft, gyro or helicopters, includes 3202 engine - |
| 33 Series |
Piston Engines; 30 hp, single-cylinder, two-stroke, air-cooled, piston engines for light aviation, includes F33 A/AS - Alpaero Exel (Optional Hirth F33), AVI Modern Wings Swan (Optional Hirth F33), Fisher FP-202 Koala (Optional Hirth F33), Fisher FP-303 (Optional Hirth F33), Fisher FP-505 (Optional Hirth F33), Fisher FP-606 Sky Baby (Optional Hirth F33), General Atomics Avenger (Hirth F33 (Avenger UL)), Spacek SD-1 Minisport (Hirth F33 AS (series-built aircraft)), TLAC Sherwood KUB (Hirth F33), U-Fly-It Aerolite 103 (Hirth F33) |
| 35 Series |
Piston Engines; 70 hp, two-cylinder, two-stroke, liquid-cooled, piston engines, for light aviation, hovercraft, gyro or helicopters, includes 3503 and H35 engines
- Distar UFM-13 Lambada (Optional Hirth 3503E) |
| 35HF |
Piston Diesel Engines; 60 hp, two-cylinder, parallel-twin, two-stroke, direct-injected, liquid-cooled, heavy fuel, piston diesel engine - UMS Skeldar V-200 (35HF) |
| 41 Series |
Piston Engines; 8 hp, two-cylinder, two-stroke, air-cooled, piston engines for UAVs, includes 4103 engine - Rheinmetall Luna (Hirth 4102) |
| 42 Series |
Piston Engines; 15 hp, two-cylinder, two-stroke, air-cooled, piston engines for UAVs, includes 4201 engine - Martin UAV V-Bat (Hirth 4201-EFI) |
| E18H |
Piston Engines; 55 hp, two-cylinder, water-cooled, fuel-injected, starter piston engine - CybAero APID 55 (Hirth E18H) |
| H37 |
Piston Engines; 90 hp, three-cylinder, two-stroke, liquid-cooled, optionally fuel-injected, piston engine for ultralight, kit-built aircraft - Coax Helicopters Coax 17 and 20 (Hirth H37), RotorSchmiede VA250 (Hirth H37) |
| S1215 |
Piston Engines; 50 hp, two-cylinder, two-stroke, air-cooled, fuel-injected, boxer, piston engine for UAVs - Denel Seeker 200/400 UAS (Hirth S1215) |
