Re: [Jsbsim-devel] F-16 Stability problems

[Bruce C. <bcl...@gm...>]

Bill:
  thanks for your reply.  I am hand flying.  If I take my hand off the
stick I can see the input "voltage" drop to zero in both pitch and roll yet
the plane still rolls off.  How can I tell if there is an autopilot in the
plane?  Or maybe a better question is how can I tell if the plane should
follow the altitude and heading hold commands?

Bruce

On Tue, Oct 11, 2016 at 9:05 PM, Bill Galbraith <bi...@ho...> wrote:

> Bruce-
>
> Are you starting this model out with a trimmer through a script, or are you
> hand-flying it?
>
> Bill
>
> -----Original Message-----
> From: Bruce [mailto:bcl...@gm...]
> Sent: Tuesday, October 11, 2016 8:40 PM
> To: jsb...@li...
> Subject: [Jsbsim-devel] F-16 Stability problems
>
> I am working with the F-16 model that is in the current version of JSBsim.
> I seem to be having some stability issues that I can not account for.   The
> model will occasionally start oscillating in pitch.  Sometimes I can get it
> to stop with a hard pitch maneuver other times it seems to settle out on
> its
> own.
>
>
>
> The second problem I am having may be related.  The model does not stay
> straight and level with zero stick input.  It will gradually roll over or
> pitch up.
>
>
>
> I tried to set the autopilot based on examples I found in the mailing list.
> I added
>
>
>
>       <property> ap/heading_setpoint <property>
>       <property> ap/heading_hold <property>
>       <property> ap/altitude_setpoint <property>
>       <property> ap/altitude_hold <property>
>
>
>
> to the output section of the f16.xml file and added heading set point value
> of 270.0, heading hold cmd value of 1.0, altitude setpoint value of 10000
> and altitude hold value of 1.0 to the output data stream with the other cmd
> parameters.  I don't get any errors but I also don't see any change in the
> models flight.  I would really like to get a basic attitude hold so I can
> programmatically hold straight and level or go in to a standard rate turn
> based on pilot input.
>
>
>
> Any suggestions would be greatly appreciated.
>
>
>
> Bruce
>
> ------------------------------------------------------------
> ----------------
> --
> Check out the vibrant tech community on one of the world's most engaging
> tech sites, SlashDot.org! http://sdm.link/slashdot
> _______________________________________________
> Jsbsim-devel mailing list
> Jsb...@li...
> https://lists.sourceforge.net/lists/listinfo/jsbsim-devel
> _______________________________________________
> The JSBSim Flight Dynamics Model project http://www.JSBSim.org
> _______________________________________________
>
>
>
> ------------------------------------------------------------
> ------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, SlashDot.org! http://sdm.link/slashdot
> _______________________________________________
> Jsbsim-devel mailing list
> Jsb...@li...
> https://lists.sourceforge.net/lists/listinfo/jsbsim-devel
> _______________________________________________
> The JSBSim Flight Dynamics Model project
> http://www.JSBSim.org
> _______________________________________________
>
>