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"Adverse yaw and roll coupling"

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Ben_Chiu

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"Adverse yaw and roll coupling"
11-16-02, 20:33z

Greetings:
I've had this question for a number of years and it occurred to me that perhaps some of the folks that fly akro could shed some light on it:
We all know what adverse yaw is (the yawing tendency towards the downward deflecting aileron during a rolling maneuver). Rudder/roll coupling (which is a tendency for aircraft to roll towards the side where rudder is applied) has been attributed to the reduced lift experienced on the side being yawed towards due to reduced airflow (fuselage blanking, one wing moving slower than the other, etc.) causing the aircraft to roll in that direction.
Well, my initial thoughts are that the forces that produce adverse yaw should be similar to the application of rudder (mentally turn an airplane 90 degrees in bank and the rudder works in the directions of an aileron and vice versa). However, the effects of roll-coupling seem not to fit adverse yaw model. Instead of a pitch up when rudder is applied in this attitude as what should happen using the adverse yaw model (it helps to draw a diagram to picture this), we experience a rolling motion when the aircraft is upright.
Of course I have my theories about why this happens, but I was wondering if anyone had some thoughts on the subject.
Thanks!
Ben

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Table of Contents

  Subject      Author      Message Date     ID

Adverse yaw and roll coupling    Ben_Chiu    11-16-02

   RE: Adverse yaw and roll coupling    Tarmack    11-18-02    1

      RE: Adverse yaw and roll coupling    Ben_Chiu    11-18-02    4

           RE: Adverse yaw and roll coupling    djpacro    11-19-02    9

                RE: Adverse yaw and roll coupling    Ben_Chiu    11-19-02    14

           RE: Adverse yaw and roll coupling    Mike_Greenwood    11-19-02    10

                RE: Adverse yaw and roll coupling    DHamblin    11-19-02    12

                RE: Adverse yaw and roll coupling    DHamblin    11-19-02    13

                     RE: Adverse yaw and roll coupling    Ben_Chiu    11-19-02    16

                RE: Adverse yaw and roll coupling    Ben_Chiu    11-19-02    15

                     RE: Adverse yaw and roll coupling    djpacro    11-25-02    21

                          RE: Adverse yaw and roll coupling    Ben_Chiu    11-25-02    22

   RE: Adverse yaw and roll coupling    DHamblin    11-18-02    2

      RE: Adverse yaw and roll coupling    Ben_Chiu    11-18-02    5

           RE: Adverse yaw and roll coupling    DHamblin    11-18-02    7

                RE: Adverse yaw and roll coupling    Mike_Greenwood    11-19-02    11

                     RE: Adverse yaw and roll coupling    AlanParkinson    11-22-02    19

                          RE: Adverse yaw and roll coupling    Mike_Greenwood    11-23-02    20

                RE: Adverse yaw and roll coupling    Ben_Chiu    11-19-02    17

   RE: Adverse yaw and roll coupling    IFLYExtra300S    11-18-02    3

      RE: Adverse yaw and roll coupling    Ben_Chiu    11-18-02    6

           RE: Adverse yaw and roll coupling    Tarmack    11-18-02    8

                RE: Adverse yaw and roll coupling    Ben_Chiu    11-19-02    18

           RE: Adverse yaw and roll coupling    ghmorris    12-01-02    23

                RE: Adverse yaw and roll coupling    ghmorris    12-01-02    24

                RE: Adverse yaw and roll coupling    Ben_Chiu    12-01-02    25

                     RE: Adverse yaw and roll coupling    ghmorris    12-02-02    26

                          RE: Adverse yaw and roll coupling    Ben_Chiu    12-02-02    27

                               RE: Adverse yaw and roll coupling    ghmorris    12-02-02    28

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