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Hi MSFS Team. I am trying to implement a fuel cutoff switch similar to what is in the 747. I realized trying to use the xml fuel template switch ( ASOBO_FUEL_Switch_Valve_Template )does not work since I do not have a fuel.system section in the flight model. If I try and and this section , aircraft editor either locks or crashes. Is there any plan to update the editor to include this section? Was this section for the 747 manually created?
Thanks,
Shervin
Hello Shervin,
The section should be named FUEL_SYSTEM as documented here: https://docs.flightsimulator.com/html/Content_Configuration/SimObjects/Aircraft_SimO/Flight_Model_Definition.htm?rhhlterm=fuel_system#[fuel_system]
This section is not editable through the AircraftEditor at the moment (it will in the future) but it shouldn't crash though. Make sure its content matches what's specified in the doc.
I can investigate on the cause of the crash if you provide me with your package.
Regards,
Sylvain
We know this is not ideal. This section will be documented as precisely as the electric systems were documented a few weeks ago. In the meantime, this is the best we can provide.
I am personally not aware of the A320 issue but devs might be. Have you created a zendesk ticket?
If you can provide me with repro steps (in a dedicated question) I can reproduce the problem and make sure it has been forwarded to the devs.
Regards,
Sylvain
Thanks Sylvain. I did take a look at that section. I'll have to tinker around with it some more. I think I may have to draw out the fuel system first then try and translate into the proper syntax. Would be nice if in the future implementation in Aircraft Editor , there is some sort of a visual reference to help debug/analyze the fuel system.
Thanks!
Shervin
"Not ideal" is a bit of an understatement, but okay, I'm confident it will get there. Thanks.
As for the A320 issue, I shouldn't have limited it to the A320. It is a fuel system issue, so it would affect any airplane that uses this new fuel system and has fuel transferred from one tank to another based on a triggering value. I did not create a Zendesk ticket as I had provided this info to our rep on the Asobo forums to give you all directly. Maybe that did not take place. I can create a Zendesk issue if it would help. There are actually 2 issues I've found with the new fuel system that would affect any airplane using the new fuel system.
The one I described - Start Asobo A320 cold and dark anywhere. Turn batteries and external power on. Adjust fuel quantity as follows: no fuel in the center tank, full left outer and inner tanks, less than 250 gallons (e.g., 216 gallons) in each inner tank. Watch the outer tank fuel levels drop without the inner tank levels (where the fuel should be going) changing. Fuel is simply disappearing.
Second issue: Any amount entered as unusable fuel is effectively being added to the total tank capacity rather than being subtracted from it. Fuel continues to be emptied from the tank to a negative amount of fuel equal to the unusable fuel. For example, for a tank with a total capacity of 2 gallons, with 1 gallon being unusable, the engines would not quit until 2 gallons of fuel is burned leaving a fuel quantity of -1 gallons. Is this why the unusable fuel quantity was set to zero for the default airplanes using the new fuel system?
To reproduce this issue, you will need to change the unusable fuel quantity for any given fuel tank from zero to some positive value in any airplane using the new fuel system. Put a small amount of fuel in that fuel tank, start the engines and burn all the fuel in that tank. The engine will not quit due to fuel starvation until the amount of fuel originally put into the tank plus the unusable fuel (rather than minus the unusable fuel) is burned.
Looks like your bug report on the forums was considered :)
Regards,
Sylvain
The issue is if the APU is burning from the center tank, and then the center tank gets to it's unusable fuel quantity (or only the unusable amount is loaded initially), the APU will quite happily run forever without burning any fuel at all. If there is initially only the unusable fuel quantity loaded in the center tank, then the left main tank must have more than its unusable fuel quantity for the APU to start, but once started, it will run along without burning any fuel. Note: for this testing no fuel was loaded in any of the other tanks. (And this testing was conducted using the FBWA320, though I would expect the same results from the default A320.)
I forwarded the issue to the developer in charge of the fuel system.
Thank you for reporting this.
What do you mean with this new fuel system? Is there some configuration to switch between some legacy and a new fuel system?
There is a SimVar you can check that will identify if your airplane is using the new [FUEL SYSTEM] section.
Thank you for the response Sylvain, but that particular altimeter issue is not what I am referring to. I am referring to an inaccurate standard pressure vs altitude relationship being used and incorrect implementation of the effect of temperature on altimeter altitude vs height above ground. The current preview build, which attempts to fix these issues with the production version, has made what used to be a fairly benign couple of issues into very serious bugs. The current status will make it very difficult for anyone to fly on VATSIM or any other online network.
We have a potential fix but we want to test it further as we're worried of possible side effects.
I'm afraid we won't be able to fix this in the Performance Plus release.
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