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Ben_Chiu Certificates/Ratings/Crew Stations: 16. "RE: Adverse yaw and roll coupling" 11-19-02, 23:36z  Greetings Dave: > Another thought, most airplanes DO have a tendancy to pitch the nose up > or down (in relation to the plane, not the ground in knife edge) with > large rudder inputs. I suppose with some CG locations or flight configuration you might pitch up, but I think most may pitch down as a result of roll-coupling; in a bank, you reduce your vertical component of lift. Or are you talking about immediate pitch down or pitch up with rudder introduction? > Again, this is affected by the placement and relationship to the rudder > and horizontal stab/elevator and is likely due to some aerodynamic flow > changes over the stab when the rudder is deflected. That's what I was thinking as well. Roll-coupling has a great deal to do with higher pressure on the horizontal stab when the air molecules start bunching up with rudder application. Of course, but it's not completely responsible for roll-coupling because dihedral and vertical CG relationships play into roll stability as well, but I agree it's definitely a factor. Well, to further the question, does the tail configuration have any bearing on whether there's any pitch up or down change with rudder application? Anyone fly an airplane with elevons not located near the rudder? > Most all RC airplanes I have flown will also display this. Most seem to > slightly pitch the nose down (one would do so violently, even in level > flight, not a good thing close to ground!). Agreed! > In fullscale you would likely have to be paying real close attention to > notice whether you have some elevator pressure in to counteract it. Yep. Was hoping someone had noticed and noted either. Ben -= VPC OffLine Reader 2.1 =- Registered to: Ben Chiu -OLR.PL v1.80- 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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