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Alec246 avatar image
Alec246 asked Alec246 commented

SDK Clarification needed for these duplicate lines - FlightModel

I recently discovered there are duplicates of important information regarding Flight Model Stability Attributes. I used to tweak using the Legacy Page. But SimTuning also shows the same attributes, but with completely different values? Which is the impostor here? Are Both interacting?

It was hard enough to understand those when it was just one of each. Now two... It's gonna make me go bald :)


why2.jpg

flightmodel
why2.jpg (1.1 MiB)
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FlyingRaccoon avatar image
FlyingRaccoon answered Alec246 commented

Hello @Alec246
The legacy page was missing some important information, there are scalars applied to those values.
This will be displayed in SU6:

1630079097692.png

Regards,
Sylvain


1630079097692.png (1.1 MiB)
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But this makes a WORLD of difference!!


Please let such cases very clearly known in further Updates :)

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boufogre avatar image
boufogre answered boufogre commented

Hey,


My guess is that the reason why the values are different is going to be the same than the one that made me think there might be a bug with the CD0.


I think the legacy value are straight from the file, and the other values are calculated during the normalisation process.


I have to experiment more with the CD0, because I cannot get the values I want in the sim and there is always a difference between my manual calculations made in Excel and the results I get in the sim.


I might open another question about the CD0.

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Oh and this CD0 problem is making me pull my hair too...

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Alec246 avatar image
Alec246 answered

I followed your Drag Question, and it was a very relevant one, and a very important discovery came from it. The Normalization process failing sometimes was never mentioned on the SDK, and it's something we didn't know to keep our eyes looking for it. Very good information for sure!


In this, something similar seems to be happening, because of the same pattern of 'New', and 'FSX' values. But it's very strange because these lines have some data that doesnt make any sense compared to the Legacy Page, where the values seem reasonable. This is where I feel the SDK could be more clear.

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SonantAlpaca avatar image
SonantAlpaca answered

Hello,

"Something weird in the documentation" sounds like a mission for @Nocturne ! Or at least we'll do some digging and tell you why there's this difference between same values.

Have a good day,

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boufogre avatar image
boufogre answered

In the case of my question, I'm not convinced that the normalisation was failing. I have asked a new question to have more details about drag calculations because I cannot make any sense of them at the moment, except for the calculation of the FSX and Total NEW values next to Base Cd0 in the Sim Tuning debug window.

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