Variable speed control employed in 3×3-ft transonic and supersonic, and 13×9-ft subsonic tunnels; grid controlled mercury arc rectifiers for variable speed d-c motors; synchronous induction motor to drive variable pitch propeller, and use of Ward-Leonard drive in conjunction with 68,000-hp variable frequency synchronous motor fed from 40-Mw gas turbine.
Wind tunnel drives for royal aircraft establishment at Bedford
English Elec J
English Electric Journal ; 15 , n 5
1958
14 pages
Article (Journal)
English
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