Julian Harrap Architects
Opened in April 1935, the Grade 1 Listed Q121 is the largest wind tunnel in Great Britain and the largest return type tunnel in Europe. It remains very much in its original condition. The level of skill and precision employed in its construction to minimize wind-flow disturbance was outstanding, even by today’s standards. The massive 24ft diameter fan, vast 40ft high return air duct and cathedral-like test preparation area permitted complete aircraft as well as large models, wing and fuselage sections and engines to be tested. This area remains an awe-inspiring sight, normally completely hidden from public view.