| Manufacturer | Post, Tooma, Org |
| Model | PTO-4 |
| Modification | PTO-4 |
| Country | Estonia |
| Years | 1938 |
| Type | Other |
| Main rotor diameter | - |
| Tail rotor diameter | - |
| Wingspan | - |
| Length | - |
| Height | - |
| Wing area | - |
| Zero fuel weight | - |
| Empty weight | - |
| Maximum takeoff weight | - |
| Normal takeoff weight | - |
| Flight duration | - |
| Engine | 1 de Havilland Gipsy Major |
| Power | 1 x 130 HP |
| Thrust | - |
| Maximum speed | 245 km/h |
| Cruising speed | - |
| Rate of climb | - |
| Practical range | - |
| Service ceiling | 5000 m |
| Hovering ceiling | - |
| Crew | - |
