| Manufacturer | Avia |
| Model | BH-21 |
| Modification | BH-21 |
| Country | Czechoslovakia |
| Years | 192 |
| Type | Fighter |
| Main rotor diameter | - |
| Tail rotor diameter | - |
| Wingspan | 8.90 m |
| Length | 6.87 m |
| Height | 2.74 m |
| Wing area | 21.96 m2 |
| Zero fuel weight | - |
| Empty weight | 720 kg |
| Maximum takeoff weight | - |
| Normal takeoff weight | 1084 kg |
| Flight duration | - |
| Engine | 1 Skoda (Hispano-Suiza) 8 Fb |
| Power | 1 x 310 HP |
| Thrust | - |
| Maximum speed | 245 km/h |
| Cruising speed | 210 km/h |
| Rate of climb | 385 m/min |
| Practical range | 550 km |
| Service ceiling | 5500 m |
| Hovering ceiling | - |
| Crew | - |
