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"Adverse yaw and roll coupling"

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djpacro

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21. "RE: Adverse yaw and roll coupling"
11-25-02, 02:26z

Ben,
You seem intent in going into this subject in more detail than I had anticipated.
My favourite report on aileron characteristics is online:
NACA TR 868, Summary of Lateral Control Research
http://naca.larc.nasa.gov/reports/1947/naca-report-868/
The most relevant to your question is, however,
NASA TN D-6946
Lateral-Directional Aerodynamic Characteristics of Light, Twin-Engine, Propeller-Driven Airplanes.
Its a cookbook of how to estimate the stability and control derivatives.
I wasn't able to find it quickly online - it may be there at
http://techreports.larc.nasa.gov/cgi-bin/NTRS
or
http://www.sti.nasa.gov/RECONselect.html
I have these on a CD - the NASA Legacy collection, from the Langley Research Centre. For some reason this did not include my other favourite report:
Riding and handling qualities of light aircraft: A review and analysis, NASA-CR-1975, Mar 01, 1972
The next step is the effect of rudder, sideslip and roll/yaw rate on pitching - most reports and textbooks ignore the cross-derivatives. ie they separate life into either lateral-directional or longitudinal characteristics.
This was the cause of an in-flight tail failure on a Tucano - during flight testing of rudder deflection and sideslips at high speed the downward pitch resulted in overloading the horizontal stabilizer. You often see tailplane inboard leading edge strakes on single engine turboprops to reduce the asymmetric effects on tailplane lift.
Then there's the gyroscopic effects of the propeller. eg applying left rudder briskly results in a pitch up.
From here - next time you're in Australia this is a good topic for discussion over a bottle of Long Flat Red.
Or, online real time discusison sometime.
Regards,
Dave Pilkington
>
>No worries.
>I just used the knife edge example to place the rudder in
>a "position" where it's similarity to an aileron could be
>more easily pictured in the mind's eye. Let's try this.
>What happens if an airplane is in a dive and rudder is
>applied? Does roll-coupling increase, decrease, or remain
>the same (assuming the same airspeed)? And to get to my
>question, is there any pitch (rotation along the
>horizontal axis parallel with the wing) change when rudder
>is applied? Based on the adverse yaw model, there should
>be a pitch change, but is there?
>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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