Re: [Flightgear-devel] speed-with-pitch

2004-09-21 Thread Roy Vegard Ovesen
På Tue, 21 Sep 2004 12:02:34 -0500, skrev David Culp <[EMAIL PROTECTED]>: > I would suggest to use airspeed as input to a PID controller, your > desired airspeed as reference and the elevator control surface as output. > I haven't tried this, so good luck! Works like a charm :-) I got it stable

Re: [Flightgear-devel] speed-with-pitch

2004-09-21 Thread Jim Wilson
David Culp said: > > > I would suggest to use airspeed as input to a PID controller, your > > > desired airspeed as reference and the elevator control surface as output. > > > I haven't tried this, so good luck! > > > > Works like a charm :-) I got it stable with: Kp=0.0125, Ti=30.0, Td=0.0 > > wi

Re: [Flightgear-devel] speed-with-pitch

2004-09-21 Thread David Culp
> > I would suggest to use airspeed as input to a PID controller, your > > desired airspeed as reference and the elevator control surface as output. > > I haven't tried this, so good luck! > > Works like a charm :-) I got it stable with: Kp=0.0125, Ti=30.0, Td=0.0 > with the Piper. You can start fr

Re: [Flightgear-devel] speed-with-pitch

2004-09-21 Thread Roy Vegard Ovesen
På Tue, 21 Sep 2004 12:00:09 +0200, skrev Roy Vegard Ovesen <[EMAIL PROTECTED]>: I would suggest to use airspeed as input to a PID controller, your desired airspeed as reference and the elevator control surface as output. I haven't tried this, so good luck! Works like a charm :-) I got it stabl

Re: [Flightgear-devel] speed-with-pitch

2004-09-21 Thread Roy Vegard Ovesen
På Mon, 20 Sep 2004 17:55:50 -0500, skrev David Culp <[EMAIL PROTECTED]>: Has anyone gotten "speed-with-pitch" autopilot mode to work properly using only PID controllers? (i.e. without outside help from the xmlauto internal code or some other system) I don't see how the speed-with-pitch contr

Re: [Flightgear-devel] speed-with-pitch

2004-09-21 Thread Erik Hofman
David Culp wrote: It seems to me the autopilot can't chose the correct pitch angle without some knowledge of the current pitch angle, or the airplane's performance. I think it wants to get a zero the angle-of-attack (alpha), which (in theory) could be done by increasing the speed. Erik _

[Flightgear-devel] speed-with-pitch

2004-09-20 Thread David Culp
Has anyone gotten "speed-with-pitch" autopilot mode to work properly using only PID controllers? (i.e. without outside help from the xmlauto internal code or some other system) I don't see how the speed-with-pitch controller in FlightGear's generic autopilot can work even in theory. The firs