| Manufacturer | Handley Page |
| Model | HP.21 |
| Modification | HP.21 |
| Country | United Kingdom |
| Years | 1923 |
| Type | Fighter |
| Main rotor diameter | - |
| Tail rotor diameter | - |
| Wingspan | 8.91 m |
| Length | 6.55 m |
| Height | 2.92 m |
| Wing area | 10.64 m2 |
| Zero fuel weight | - |
| Empty weight | 599 kg |
| Maximum takeoff weight | - |
| Normal takeoff weight | 921 kg |
| Flight duration | 3 h |
| Engine | 1 Bentley B.R.2 |
| Power | 1 x 230 HP |
| Thrust | - |
| Maximum speed | 233 km/h |
| Cruising speed | 206 km/h |
| Rate of climb | - |
| Practical range | - |
| Service ceiling | 6400 m |
| Hovering ceiling | - |
| Crew | - |
