| Manufacturer | Doak |
| Model | VZ-4 |
| Modification | VZ-4 |
| Country | USA |
| Years | 1958 |
| Type | Experimental aircraft |
| Main rotor diameter | - |
| Tail rotor diameter | - |
| Wingspan | 7.77 m |
| Length | 9.75 m |
| Height | - |
| Wing area | - |
| Zero fuel weight | - |
| Empty weight | 780 kg |
| Maximum takeoff weight | - |
| Normal takeoff weight | 1452 kg |
| Flight duration | - |
| Engine | 1 Lycoming YT53 |
| Power | 1 x 860 HP |
| Thrust | - |
| Maximum speed | 370 km/h |
| Cruising speed | - |
| Rate of climb | - |
| Practical range | 370 km |
| Service ceiling | - |
| Hovering ceiling | - |
| Crew | - |
