• Which the release of FS2020 we see an explosition of activity on the forun and of course we are very happy to see this. But having all questions about FS2020 in one forum becomes a bit messy. So therefore we would like to ask you all to use the following guidelines when posting your questions:

    • Tag FS2020 specific questions with the MSFS2020 tag.
    • Questions about making 3D assets can be posted in the 3D asset design forum. Either post them in the subforum of the modelling tool you use or in the general forum if they are general.
    • Questions about aircraft design can be posted in the Aircraft design forum
    • Questions about airport design can be posted in the FS2020 airport design forum. Once airport development tools have been updated for FS2020 you can post tool speciifc questions in the subforums of those tools as well of course.
    • Questions about terrain design can be posted in the FS2020 terrain design forum.
    • Questions about SimConnect can be posted in the SimConnect forum.

    Any other question that is not specific to an aspect of development or tool can be posted in the General chat forum.

    By following these guidelines we make sure that the forums remain easy to read for everybody and also that the right people can find your post to answer it.

FSXA Fuel Flow

U

ukmil

Messages
114
I am creating a set of 3d gauges, and I am stumped on fuel flow.

I tried to create one using TURB ENG FUEL FLOW PPH, but nothing.

So, i added a variety of differnt 2d FF gauges to my panel, for testing, from some of the stock aircraft, and I get ZERO FF all the time.

Is there something in the CFG that triggers FF? I have FF scalers etc, but no gauges show FF at all
 
it should, but it does not.


as I have said, I have tried testing with numerous 2d ones too, here is my VC 3d using same code as above, and reading nothing when RPM on both engines is running

g1.jpg


here is my 2d panel, with a few STOCK FF gauges added for testing, and NON are reading any FF. SO it must be something in my CFG files stopping it???

g2.jpg


no matter what codes I try from SDK, I never get a FF reading
 
This is working for my JT4D engines:

(A:ENG FUEL FLOW PPH:1, pph)
(A:ENG FUEL FLOW PPH:2, pph)
 
yip, tried those, nothing, no movement on the dial. I am positive something is stopping FF from being monitored
 
I can't imagine what that could be. I notice that there are only two entries for fuel flow in the aircraft.cfg file:

[generalenginedata]
engine_type = 1 //0=piston, 1=jet, 2=none, 3=helo-turbine, 4=rocket, 5=turboprop
engine.0 = -35.8, -1.5, -0.1 // -2.5 lat reduced due to fsx exaggerationreference datum
engine.1 = -35.8, 1.5, -0.1 //(feet) longitudinal, lateral, vertical distance from reference datum
fuel_flow_scalar = 1.0 //scalar for fuel flow efficiency
min_throttle_limit = 0 //minimum percent throttle. generally negative for turbine reverser

[turbineenginedata]
fuel_flow_gain = 0.1 //0.001 gain on fuel flow
inlet_area = 2.4 // changed from 2.4 to compensate for alt perf loss
rated_n2_rpm = 16550 //rpm, second stage compressor rated value
static_thrust = 2050 //lbs, max rated static thrust at sea level
afterburner_available = 5 //afterburner stages available?
afterburner_throttle_threshold = 0.85 //percent of throttle range where a/b begins
reverser_available = 0 //thrust reverser available?
thrustspecificfuelconsumption = 2.0 //thrust specific fuel consumption (jets)
afterburnthrustspecificfuelconsumption = 3.0 //tsfc with afterburn/reheat engaged
 
yip, and both mine resemble that, so who knows what is going on, but I am getting no FF at all
 
well, it seems i have no fuel flow indicated, but as my fuel level does drop, and the engines the engines fire, and run fine, I just get no FF indicated, :confused:
 
Last edited:
ok, created a simple gauge to test different variables, and one DID work

g3.jpg


as you can see, the top one finally worked, and that was

TURB ENG CORRECTED FF:index

wierd that TURB ENG FUEL FLOW PPH does not?

still, I now have a working FF gauge:eek:
 
It might really be an airfile/.cfg issue, as the fuel flow is too low, even for idle.

Try increasing the parameters pointed out by Bill and see if you get a reading on the other two A: vars.
 
To the best of my knowledge you can not vary fuel flow rate in the .air file, but the rate of increase in fuel flow with RPM is affected by Section 1505 so if it was corrupted, that might be a cause.

Fuel_flow_gain affects spool up rates not fuel flow per se. Fuel_flow_scalar is what it says, a scalar on the basic assumed turbo fuel rate.

thrustspecificfuelconsumption affects fuel flow. It appears to override Fuel_flow_scalar if that value is 1, but if fuel_flow_scalar is not 1 then thrustspecificfuelconsumption appears to be overriden.

However, as long as the .cfg files are not zero I can not see how a running engine would have no fuel flow.

Have a look at your 1505 compared to a stock one
Roy
 
You must log in or register to reply here.
Back
Top