| Manufacturer | Junkers |
| Model | EF.128 |
| Modification | EF-128 |
| Country | Germany |
| Years | - |
| Type | Experimental aircraft |
| Main rotor diameter | - |
| Tail rotor diameter | - |
| Wingspan | 8.90 m |
| Length | 7.05 m |
| Height | 2.65 m |
| Wing area | 17.60 m2 |
| Zero fuel weight | - |
| Empty weight | 2607 kg |
| Maximum takeoff weight | - |
| Normal takeoff weight | 4077 kg |
| Flight duration | - |
| Engine | 1 РД Heinkel-Hirth HeS 011 |
| Power | - |
| Thrust | 1 x 1300 kN |
| Maximum speed | 990 km/h |
| Cruising speed | - |
| Rate of climb | - |
| Practical range | - |
| Service ceiling | 13750 m |
| Hovering ceiling | - |
| Crew | 1 |
