> In every aeronautical engineering publication I've seen, the > convention for "positive" has been: > -- Positive aileron deflection creates a positive rolling moment, > positive around the +X axis, i.e. roll to the right; > -- Positive rudder deflection creates a positive yawing moment, > positive around the +Z axis, i.e. yaw to the right; and > -- Positive elevator deflection creates a positive pitching moment, > positive around the +Y axis, i.e. nose up.
This is wrong. A positive elevator angular deflection (about the +Y axis) makes the trailing edge of the elevator move down, resulting in a negative pitching moment. I don't think I've seen any publications that show things the way you describe for elevator. Likewise, a positive rotation of the rudder about the Z axis (positive downward, with Y positive out the right wing and X positive foward) results in the trailing edge moving left, resulting in a negative yawing moment. Jon ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
