| Manufacturer | Bristol |
| Model | Bristol 138 |
| Modification | Bristol 138A |
| Country | United Kingdom |
| Years | 1936 |
| Type | Experimental aircraft |
| Main rotor diameter | - |
| Tail rotor diameter | - |
| Wingspan | 20.17 m |
| Length | 13.41 m |
| Height | 3.11 m |
| Wing area | 52.77 m2 |
| Zero fuel weight | - |
| Empty weight | 1992 kg |
| Maximum takeoff weight | - |
| Normal takeoff weight | 2408 kg |
| Flight duration | - |
| Engine | 1 Bristol Pegasus P.E.6S |
| Power | 1 x 500 HP |
| Thrust | - |
| Maximum speed | 198 km/h |
| Cruising speed | - |
| Rate of climb | - |
| Practical range | - |
| Service ceiling | 12000 m |
| Hovering ceiling | - |
| Crew | - |
