Re: [Jsbsim-devel] Flaps command not changing flaps position

[Ron J. <wi...@je...>]

Caveat: I have never used the library, only standalone and flightgear

On Monday 05 August 2019 02:29:29 pm Martin Hoffmann wrote:
>       - ...
>       - FCS->SetDfCmd(10.0d); // set flaps to 10 percent
>       - ...

Should this be in the range [0-1] with 1 being 100%?

in my tree:
src/models/FGFCS.h:  double GetDfCmd(void) const { return DfCmd; }
src/models/FGFCS.h:  void SetDfCmd(double cmd) { DfCmd = cmd; }

src/models/FGFCS.cpp:  PropertyManager->Tie("fcs/flap-cmd-norm", this, 
&FGFCS::GetDfCmd, &FGFCS::SetDfCmd);


>       - aircraftStatus.FlapsPos = FCS->GetDfPos();

This call seems to take an argument from src/models/FGFCS.h 
typedef enum { ofRad=0, ofDeg, ofNorm, ofMag , NForms} OutputForm;

try FCS->GetDfPos(ofNorm); ?

> I'm using the C172p model for a first test

Is that the JSBSim model or the FlightGear model? Make sure there is xml in 
the flightcontrol tag that creates fcs/flap-pos-deg and doesn't do any 
failure modes on you. I notice the latest c172p from FlightGear includes some 
electrical system logic...

        <channel name="Flaps">
            <kinematic name="Flaps Control">
                <input>fcs/flap-cmd-norm</input>
                <traverse>
                    <setting>
                        <position>0</position>
                        <time>0</time>
                    </setting>
                    <setting>
                        <position>10</position>
                        <time>2</time>
                    </setting>
                    <setting>
                        <position>20</position>
                        <time>1</time>
                    </setting>
                    <setting>
                        <position>30</position>
                        <time>1</time>
                    </setting>
                </traverse>
                <output>fcs/flap-pos-deg</output>
            </kinematic>
        </channel>

And note the time in the xml is in seconds, so it takes 4 seconds to apply 
full flaps.