OK. But I am not sure I agree with FlightGear's convention. The rudder Z axis is downward. A positive deflection (by the right hand rule) rotates (should rotate) the trailing edge left. The elevator deflection follows the same convention, right hand rule about the Y axis hinge line. Aileron is different, though. Personally, I would have thought that a positive aileron deflection should result in a positive roll rate, but it is opposite. Aileron is a rate control, unlike the other controls. Right aileron down is positive, resulting in a left roll.
Jon > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of David > Megginson > Sent: Tuesday, May 28, 2002 7:14 AM > To: [EMAIL PROTECTED] > Subject: RE: [Flightgear-devel] Rudder inverted again in yasim > > > Jon Berndt writes: > > > > I agree -- JSBSim is reporting a positive normalized position for > > > a negative input (and vice-versa). Obviously, we've made > > > allowances for that in the model animations, but it's > > > inconsistent with the behaviour elsewhere. I'll look into fixing > > > it. > > > > Before making changes, can you elaborate on this "problem"? > > 1. FlightGear uses a negative value for left rudder input. > > 2. JSBSim internally uses a positive value for left rudder deflection. > > 3. JSBSim publishes the rudder surface position back to FlightGear > with positive for left rudder. > > No change to the JSBSim core was required -- I just multiplied > FCS->GetDrPos(ofNorm) by -1 before passing the value to the FlightGear > property. > > > All the best, > > > David > > -- > David Megginson, [EMAIL PROTECTED], http://www.megginson.com/ > > _______________________________________________ > Flightgear-devel mailing list > [EMAIL PROTECTED] > http://mail.flightgear.org/mailman/listinfo/flightgear-devel >
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