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question

boufogre avatar image
boufogre asked FlyingRaccoon answered

Wing twist?

Hello,

Looking at the default 747 after updating to SU9 beta, if I open the stall debug window, here is what I can read about the wing twist:

1648924195123.png


I do not quite understand the information shown about wing twist.


What is the "Add to tip twist"?

Where does it come from?

Why is the middle wing AOA negative? If the wing incidence is 2°, then it should be 2° more than the plane AOA (2.2°), and show 4.2° instead of -1.1°.

In a similar way, if the wing twist is -5°, then the left and right wing tip AOA should be:
Tip AOA = plane AOA + wing incidence + wing twist = 2.2 + 2 + (-5) = -0.6°

Can you explain this debug window?

Thank you!


aircraftflightmodel
1648924195123.png (2.6 MiB)
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StevenPearce avatar image
StevenPearce answered

In the CFG for the new 172, we have some additional parameters. As for how they work, and how to correctly configure them, your guess is as good as mine.

Stall_AileronAddIncidence = 1
Stall_TipAddIncidence = 2.0
Stall_TipAddTwist = 5
Stall_TipTwistScaleRatio = 1.0
StallDef_StartRatio = 0.9
StallDef_EndRatio = 1.4;
StallDef_CurvePower = 1.1;
StallDef_minTransition = 0.025;
StallDef_airflowdetachspeed = 10
StallDef_airflowattachspeed = 10
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boufogre avatar image
boufogre answered

Thank you! That will surely help, now we only need to wait for these parameters to get documented.

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Simbol avatar image
Simbol answered Simbol edited

@FlyingRaccoon,

Hi Sylvain, could it be posible to explain these pararements? I am having trouble with my project to replicate the stall behavior as per real world, a particular problem is my airplane never incurs on stall spins.. it only stalls forward and I am wondering if these parameters could help me to tweak things further in order replicate it.

Regards,
Raul

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FlyingRaccoon avatar image
FlyingRaccoon answered

Hello

We're working on it, I'll come back to you as soon as I have the updated doc content.

Regards,
Sylvain

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