Royal Aircraft Establishment, Farnborough, UK

The 30' diameter mahogany fan blades at the Royal Aircraft Establishment at Farnborough. This is the main duct that leads into the Q121 low speed wind tunnel. There were several wind tunnels at the RAE and this amazing feet of engineering was instrumental in the early development of Britain's first mass produced aircraft. The size of the Q121 tunnel allowed for the testing of entire air-frames, whereas the small tunnels tested the aerodynamic qualities of parts or scale models.