For area entries, the AmbientBleedStaticFlow setting is very hard to tune for realistic behavior and seems to act like a required field.
In the default 737 pneumatic example, AmbientBleedStaticFlow is not present for the areas, but in practice the sim behaves as if some non-zero value is required. In my own testing:
0.0001 is the smallest value the sim appears to read. Anything below that is ignored.
From 0.0001 up to about 0.1, the effective “leak” rate into the cabin feels the same. At these values, ambient temperature leaks into the cabin too quickly for a “doors closed” situation.
With doors closed, I’d like the cabin temperature to stay stable without a noticeable constant ambient leak. Instead, I’d rather have door/window openings be the main driver that quickly equalizes both pressure and temperature with outside air (the way pressure already behaves when an opening is made).
What I’d like to request:
Either:
Allow AmbientBleedStaticFlow to be truly optional or zero (no static ambient temperature leak with doors closed),
Or expand its usable range so we can set much smaller effective values with finer control over the leak rate.
Ensure that opening doors and windows can be used to quickly balance cabin temperature with ambient air, even if AmbientBleedStaticFlow is very small or zero—matching how openings already affect cabin pressure.
I have made some tests with the C208, spawning in a cold start configuration.
Its areas have this parameter set to 0.05. Changing the exterior temperature shows the cabin temperature slowly converge towards exterior temperature, as expected. (simrate was 8x here, to demonstrate the behavior)
I have then tried both setting it explicitly to 0.0, or removing the attribute from the area lines.
The result is the temperature does not change at all regardless of the exterior temperature.
Isn’t this what you observe?
Regarding the possibility to have temperature/pressure equalize based on window/door opening, this seems to be the purpose of these parameters:
Was that with the doors and windows open or closed? And engines running? Outside air should not effect inside when closed if there is cool air or heat is being added to the cabin.
With doors closed, I’d like the cabin temperature to stay stable without a noticeable constant ambient leak.
We also tested the C208 as you suggested, and we noticed that no matter how low we set the value, the temperature changes about one degree Celsius per second, even though that plane isn’t pressurized. In our pressurized aircraft using #AmbientBleedStaticFlow:0.1, we’re seeing a similar rapid temperature change, which is too fast for a sealed cabin scenario. We need it to be slower, especially when we have our own heating or cooling in effect. Also, when we open and close doors in our pressurized setup, we don’t see the expected temp change increase.
Yes… #OpeningNames:MAIN EXIT (name of the interaction points) does nothing. This should rapidly depressurize and balance out the ambient temps.
I’m not sure why I don’t see the same behavior.
Can you please share the latest version of your Learjet package with us?
I’d like to make sure we are looking at the same thing, and that the change we will suggest will work on your aircraft.
Planning to do this for the last few weeks. Had a hardware failure took time to resolve it. And I also have a failure system not finished and don’t want to send a copy that could trigger failures without you knowing. I will be done in a few days and will send over the latest version and instructions about the failure system.
