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"Adverse yaw and roll coupling"

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DHamblin

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2. "RE: Adverse yaw and roll coupling"
11-18-02, 12:32z

The same forces that do create adverse yam likely do exist on the rudder as well. However, the vertical stab(rudder) is not as long as the wing, so the moment arm cannot exert the same force on the plane as the longer moment arm wing/aileron can. If you extended the vertical fin to a length similar to the wing, applying rudder would likely cause a pitch up.
The Luscombe I got my first 14 hours on (1946 8A) has an "impressive" amount of adverse yaw; a great tool to learn about it whereas our C150H has very little (I like to fly the Luscombe every so often to prevent lazy feet).
In my RC model experience, I've seen that roll coupling on the models is tied also into the airfoil shape and dihedral of the wing. "Flat bottom" wings tend to roll more than symetrical with rudder. My sons RC trainer can be almost rolled with the rudder (large wingspan, clark "Y" airfoil etc) where as my RC Extra rolls very little with rudder (symetrical airfoil etc).
So my two cents are the forces are there, but not in an amount you can percieve.
Now to really muck up the discussion; I have had several RC models that would either pitch up (or down) violently with full rudder applications. In reseraching this, it has to do with the placement of the horizontal stab, but that gets into another complicated subject!!!!
Dave Hamblin
(formerly DaveH on old site!)

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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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