> Hi guys,
> Im attempting to add a groundspeed property , but need some
> assistance if anyone feels up to it...
> The logical place seems to be /source/FDM/flight.cxx , so I added this :
>
> fgTie("/velocities/groundspeed-kt", this,
> &FGInterface::get_V_ground_speed,
> &FGInterface::set_V_ground_speed,
> false);
>
> void FGInterface::set_V_ground_speed(double v) {
> v_ground_speed = v;
> return v *
> }
>
> and the appropriate modifications to flight.hxx .This works
> great, I now get a /velocities/groundspeed-kt, but from further
> poking and prodding , I think it returns feet per second ....
> The property is showing nearly double airspeed ....
> Yes my class inexperience is showing :)
>
> Should I have this instead ?
>
> void FGInterface::set_V_ground_speed(double v) {
> gspd = v * SG_FEET_TO_METER * 3600 * SG_METER_TO_NM;
> v_ground_speed = gspd;
> return gspd;
> }
In FGJSBsim there is this:
_set_V_ground_speed( Auxiliary->GetVground() );
That is, JSBSim already calculates ground speed in ft/sec. I'm not sure I
understand what you are trying to do. I would think that all FDMs work in
the same units when setting V_ground_speed.
Jon
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