| Manufacturer | Letov |
| Model | S.20 |
| Modification | S.20 |
| Country | Czechoslovakia |
| Years | 1925 |
| Type | Fighter |
| Main rotor diameter | - |
| Tail rotor diameter | - |
| Wingspan | 9.70 m |
| Length | 7.44 m |
| Height | 2.56 m |
| Wing area | 18.40 m2 |
| Zero fuel weight | - |
| Empty weight | 728 kg |
| Maximum takeoff weight | - |
| Normal takeoff weight | 1048 kg |
| Flight duration | - |
| Engine | 1 Skoda HS 8 Fb |
| Power | 1 x 300 HP |
| Thrust | - |
| Maximum speed | 256 km/h |
| Cruising speed | 225 km/h |
| Rate of climb | 360 m/min |
| Practical range | 530 km |
| Service ceiling | 7200 m |
| Hovering ceiling | - |
| Crew | 1 |
