I see.
Looking at the code (I think) I can see you are trying calculate the pressure
losses in the injector/throttle valve, "airbox" and inlet tubes. Using throttle
position and engine speed (was expecting cylinder displacement here also).
Basically your MAP at idle is to low, thus the pressure loss too high. As 99%
of the pressure loss comes from the injector/throttle position, I would say for
idle power setting the injector air valve should be a bit more open?
I assume it is only calculated for indication and not for engine power calcs?
Eric
> From: w...@jentronics.com
> To: flightgear-devel@lists.sourceforge.net
> Date: Tue, 11 Dec 2012 06:20:23 -0700
> Subject: Re: [Flightgear-devel] JSBSim Piston Engine Idle
>
> On Tuesday 11 December 2012 00:55:35 Eric van den Berg wrote:
> > Ron,
> >
> > From experience: the lyco IO540 idles at 14-15 inHG, 900RPM (MT-prop with
> > P-880-xx governor)
> >
> > Eric
> >
>
> Thanks Eric,
>
> The JSBSim piston engine model is missing something, probably Mach effect
> through the intake valve, so models tend to idle at lower manifold pressures
> than real engines. The current code idles most engines around 10-11 inHg, but
> the oldest code used 6 inHg...
>
> Ron
>
>
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