| Manufacturer | Letov |
| Model | S.31 |
| Modification | S.31 |
| Country | Czechoslovakia |
| Years | 1929 |
| Type | Fighter |
| Main rotor diameter | - |
| Tail rotor diameter | - |
| Wingspan | 9.80 m |
| Length | 7.15 m |
| Height | - |
| Wing area | 21.80 m2 |
| Zero fuel weight | - |
| Empty weight | 830 kg |
| Maximum takeoff weight | - |
| Normal takeoff weight | 1254 kg |
| Flight duration | - |
| Engine | 1 Walter Jupiter |
| Power | 1 x 450 HP |
| Thrust | - |
| Maximum speed | 254 km/h |
| Cruising speed | 225 km/h |
| Rate of climb | 500 m/min |
| Practical range | 320 km |
| Service ceiling | 8000 m |
| Hovering ceiling | - |
| Crew | - |
