| Manufacturer | Letov |
| Model | S.18 |
| Modification | S.18 |
| Country | Czechoslovakia |
| Years | 1925 |
| Type | Light aircraft |
| Main rotor diameter | - |
| Tail rotor diameter | - |
| Wingspan | 10.00 m |
| Length | 6.68 m |
| Height | - |
| Wing area | 16.30 m2 |
| Zero fuel weight | - |
| Empty weight | 345 kg |
| Maximum takeoff weight | 555 kg |
| Normal takeoff weight | - |
| Flight duration | - |
| Engine | 1 Walter NZ 60 |
| Power | 1 x 60 HP |
| Thrust | - |
| Maximum speed | 140 km/h |
| Cruising speed | 105 km/h |
| Rate of climb | - |
| Practical range | 325 km |
| Service ceiling | 3500 m |
| Hovering ceiling | - |
| Crew | 2 |
