| Manufacturer | Halton |
| Model | HAC.1 Mayfly |
| Modification | HAC.1 |
| Country | United Kingdom |
| Years | 1927 |
| Type | Light aircraft |
| Main rotor diameter | - |
| Tail rotor diameter | - |
| Wingspan | 8.69 m |
| Length | 6.71 m |
| Height | - |
| Wing area | 18.10 m2 |
| Zero fuel weight | - |
| Empty weight | 218 kg |
| Maximum takeoff weight | 417 kg |
| Normal takeoff weight | - |
| Flight duration | - |
| Engine | 1 Bristol Cherub III |
| Power | 1 x 32 HP |
| Thrust | - |
| Maximum speed | 134 km/h |
| Cruising speed | 121 km/h |
| Rate of climb | - |
| Practical range | - |
| Service ceiling | - |
| Hovering ceiling | - |
| Crew | 2 |
