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ghmorris Certificates/Ratings/Crew Stations: 23. "RE: Adverse yaw and roll coupling" 12-01-02, 02:12z  The question seems to be (correct me if I've got it wrong), when one applies rudder in normal, upright flight, why doesn't the nose pitch up since when ailerons are deflected in normal, upright flight the lifting wing drags. Right? Adverse yaw (or aileron drag) is caused because the wing is lifting, as the aileron is deflected down the chord line of that section of the wing changes, increasing the angle of attack, thus increasing the both the lift and induced drag of the wing. Since drag is increased on one side of the airplane, it yaws towards the lifting wing. The higher the angle of attack, the more pronounced the tendency for the lifting wing to drag. In normal flight, the rudder is not lifting much, if at all (low or zero angle of attack). When the rudder if deflected, there is a force pushing the rudder to one side, but this force is ABOVE the longitudinal axis of the airplane, causing it to roll in the direction of the rudder deflection. In knife edge, the rudder acts like the elevator, causing pitch up and down, however since it is asymmetric some aileron must be used to keep the airplane from rolling, since all the rudder's force is still not on the logitudinal axis. -Greg Morris- CFI Sunrise Aviation http://www.sunrise-aviation.com/aerobatic.html Remove | Alert Edit | Reply | Reply With Quote | Top

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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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