N.A.C.A. Technical Memorandum No.5S3 Figs.3,4 B C D Fig.3 The principle of operation of a Flettner type servo rudder. Servo angle required toQhold Main rudder over 10 … .05 ,1 .15 .2 .25 Position main rudder hinge Servo angle required to hold 10 05 8 Chord main rudder CD O 6 / H O M O fcD > <D 4 Q—' CQ CD 2 H bD 0 _.0b .1 .15 .2 .25 Fige.4 Position main rudder hinge,
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