[Jsbsim-users] Moving throttles independantly

[<bi...@ho...>]

JSBers,

 

I'm attempting to set up a Vmca test for a twin engine aircraft. It's
basically trim at 1.3Vstall, cut one engine, advance the other engine to
max, and slow the aircraft with elevator until you have the rudder maxed out
and lose heading control. Easy test, huh?

 

I have a similar test which is just a simple acceleration test. Trim the
aircraft, advance both throttles, record the results. I used that as my test
case for experimentation. In it, I trim the aircraft, then issue  this event

 

      <set name="fcs/throttle-cmd-norm[0]" value="1.0" action="FG_RAMP"
tc="0.25"/>

      <set name="fcs/throttle-cmd-norm[1]" value="1.0" action="FG_RAMP"
tc="0.25"/>    

 

That works as expected. Both engines spool up, airplane go fast. However, if
I delete the command for engine [1], I get the same results.

 

I've added these lines at the end of the Citation.xml file in the output
block

 

                        <property> fcs/throttle-cmd-norm[0] </property>

                        <property> fcs/throttle-cmd-norm[1] </property>

                        <property> fcs/throttle-pos-norm[0] </property>

                        <property> fcs/throttle-pos-norm[1] </property>

                        <property> propulsion/engine[0]/thrust-lbs
</property>

                        <property> propulsion/engine[1]/thrust-lbs
</property>

 

Looking at the .CSV file generated, the fcs/throttle-cmd-norm[0] and
fcs/throttle-cmd-norm[1] act as expected ( [0] advances to 1, [1] stays at
the trim value ).

 

HOWEVER, both throttle-pos-norm[0] and throttle-pos-norm[1] advance to 1,
and both engines spool up.

 

Anyone have any insight into this, before I start digging into code?

 

Thanks,

Bill



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