| Manufacturer | einkel |
| Model | HD.28 |
| Modification | HD.28 |
| Country | Germany |
| Years | 1926 |
| Type | Other |
| Main rotor diameter | - |
| Tail rotor diameter | - |
| Wingspan | 15.00 m |
| Length | 10.95 m |
| Height | 4.17 m |
| Wing area | 59.50 m2 |
| Zero fuel weight | - |
| Empty weight | 2850 kg |
| Maximum takeoff weight | - |
| Normal takeoff weight | 3850 kg |
| Flight duration | - |
| Engine | 1 BMW IV |
| Power | 1 x 320 HP |
| Thrust | - |
| Maximum speed | 200 km/h |
| Cruising speed | 150 km/h |
| Rate of climb | - |
| Practical range | 1400 km |
| Service ceiling | 4500 m |
| Hovering ceiling | - |
| Crew | 3 |
