Re: [Jsbsim-users] Moving throttles independantly

[David C. <dav...@co...>]

Hi Bill,


I'd check the aircraft configuration file first and make sure there 
isn't an FCS component that puts throttle-cmd-norm[0] in charge of both 
engines.


Dave



On 10/30/23 13:09, bi...@ho... wrote:
>
> 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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