4ft and 18in High Speed Tunnels

Article from The Engineer, 21 October 1960

Two large blow-down wind tunnels were opened last Wednesday by the Minister of Aviation at the Warton aerodrome of English Electric Aviation Ltd.  One, of 4ft square section, is limited by liquefaction to M4 but will run down to M0.4, while the other, of 1' 6" section, has an air heater and will, when completed, have a range of M1.5 to M 6.0.

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from Brian Rollo May 2015