Re: [Flightgear-devel] how to find remaining fuel

[Seamus Thomas Carroll]

Hi,
I seemed to have had a "feature" in my code that caused the tanks to be 
filled making me think that the tanks were increasing in fuel.  The code 
seems to work correctly now.

Thanks,
Seamus
On Mon, 28 Feb 2005, Andy Ross wrote:
Seamus Thomas Carroll wrote:
The fuel levels seem to retrieve correctly.
I then added the following code to set the fuel levels for when the
c172 aircraft starts:
fgSetDouble( "/consumables/fuel/tank[0]/level-gal_us", tank1 );
fgSetDouble( "/consumables/fuel/tank[1]/level-gal_us", tank2 );
The 172 is a JSBSim aircraft, so Jon or one of the JSB crew will have
to provide specifics about this particular situation.
But for YASim aircraft (really: users of the Nasal fuel system), this
will not work.  You can set the current fuel only using the level-lbs
properties.  The -gal_us and -norm are output-only convenience
properties that may be useful to panel code.  Setting them is a noop;
their values will be clobbered by the FDM.
If I remember correctly, JSBSim does not currently support setting
fuel state through the property system.  Instead, since you are in
C++, you should be able to find an interface there.
Andy
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