| Manufacturer | Letov |
| Model | S.4 |
| Modification | S.4 |
| Country | Czechoslovakia |
| Years | 1922 |
| Type | Fighter |
| Main rotor diameter | - |
| Tail rotor diameter | - |
| Wingspan | 8.00 m |
| Length | 6.58 m |
| Height | 2.62 m |
| Wing area | 16.43 m2 |
| Zero fuel weight | - |
| Empty weight | 673 kg |
| Maximum takeoff weight | - |
| Normal takeoff weight | 980 kg |
| Flight duration | - |
| Engine | 1 Hispano-Suiza 8Ba |
| Power | 1 x 220 HP |
| Thrust | - |
| Maximum speed | 232 km/h |
| Cruising speed | 200 km/h |
| Rate of climb | 323 m/min |
| Practical range | 500 km |
| Service ceiling | - |
| Hovering ceiling | - |
| Crew | - |
