I have been making some panels and lots of tinkering etc for a 737-NG600
based set up, upgrading from the old 737-300 based model i have used in the
past.
The 300 model used *fuel-flow_pph* from the engine prop tree to drive the
panel fuel flow meters. In the 600 model these values remain unset, but the
engines are the same, and the model engine configs for the CFM56 are
identical files and don't define a fuel flow rate.
I see these days there is a nasal script that adds *fuel-consumed-lbs* and *
out-of-fuel* to the engine properties, but it also relies on the flow rates
so the total and flag are never set.
It must be in the aircraft model somewhere as one works and one does not,
but I cant find it it anywhere in the old 737-300 model.
On top of that I see the fuel levels on the tanks is dropping when the
engines run. Even then the tank valves are turned off. And the engines only
start when there fuel in the tank then stop as soon as the tank is empty.
So can anyone advise what is the story here and how the *fuel-flow_pph *is
defined? I assumed it was just a function on the engine in jbsim I need bit
of a primer here.
--
Regards Harry
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