| Thor | |
|---|---|
 Bristol Thor modified for display purposes | |
| Type | Ramjet |
| National origin | United Kingdom |
| Manufacturer | Bristol Aero Engines |
| First run | 1950 |
| Major applications | Bristol Bloodhound |
The Bristol Thor, latterly Bristol Siddeley BS.1009 Thor, was a 16-inch (41 cm) diameter ramjet engine developed by Bristol Aero Engines (later Bristol Siddeley Engines) for the Bristol Bloodhound anti-aircraft missile.
Although Bristol Aero Engines acquired ramjet technology from the US company Marquardt, BAE put considerable effort into developing the Thor unit, including the construction of a high altitude test plant (HATP) at their Patchway site, with a supersonic test cell.
The Bloodhound Mk.1 could attain a speed of Mach 2.2, while the Mk.2 was capable of just over Mach 2.7.
