| Manufacturer | Junkers |
| Model | Ju.21 |
| Modification | Ju.21 |
| Country | Germany |
| Years | 1923 |
| Type | Other |
| Main rotor diameter | - |
| Tail rotor diameter | - |
| Wingspan | 10.77 m |
| Length | 7.30 m |
| Height | 2.50 m |
| Wing area | 21.80 m2 |
| Zero fuel weight | - |
| Empty weight | 830 kg |
| Maximum takeoff weight | - |
| Normal takeoff weight | 990 kg |
| Flight duration | - |
| Engine | 1 BMW IIIa |
| Power | 1 x 185 HP |
| Thrust | - |
| Maximum speed | 217 km/h |
| Cruising speed | 185 km/h |
| Rate of climb | - |
| Practical range | 750 km |
| Service ceiling | - |
| Hovering ceiling | - |
| Crew | 2 |
