Sigma AircraftUltralight · Fixed-wing · Russia
Sigma-4
- Seats
- 2 2
- Power
- 101 hp75 kW
- Cruise
- 92 kt170 km/h
About the Sigma-4
The Sigma Aircraft Sigma-4 is a fixed-wing ultralight aircraft featuring a twin-boom layout and a side-by-side seating configuration for two occupants beneath an elevated single engine. It is well-suited for tourism, training, and recreational sport flying, offering versatility through various landing gear options including floats or snow skis.
Originating from a Russian design bureau before later association with subsequent developers and manufacturers, the type achieved light-sport compliance in the United States and international kit deliveries. The airframe combines a metal framework with composite skin structures, glass-reinforced plastic control surfaces, and a standard ballistic recovery parachute system. A small number of airframes have seen active service across experimental stations, aero clubs, and private ownership.
Sigma-4 running costs
$162 an hour| Low | Typical | High | |
|---|---|---|---|
| Fuel | $4,304 | $5,412 | $6,362 |
| Oil | $81 | $101 | $131 |
| Engine overhaul reserve | $800 | $867 | $1,167 |
| Annual inspection and maintenance | $2,500 | $3,500 | $4,500 |
| Hangar | $3,000 | $6,300 | $9,600 |
| Total | $10,685 | $16,180 | $21,760 |
| Per hour | $107 | $162 | $218 |
Engine
- Model
- Rotax 912ULS
- Power
- 101 hp
- Overhaul
- 2,000 h / 15 yr
- Fuel burn
- 5.7 – 7.1 gal/h
- Fuel price
- $8.20 /US gal
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