AN interesting feature of the new Armstrong‐Whitworth “Argosy” machines shortly to be delivered to Imperial Airways Limited is a novel type of servo‐control for ailerons and rudders.
(1929), "Servo Control for Ailerons and Triple Rudders: Important and Novel Control Features Characterise the Newest and Largest Air Liners for British Routes", Aircraft Engineering and Aerospace Technology, Vol. 1 No. 5, pp. 180-181. https://doi.org/10.1108/eb029152
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