How to prevent S-turn issues with certain aircraft autopilots
Posted by Damian Clark, Last modified by Damian Clark on 17 October 2011 09:18 AM

When using certain high-fidelity aircraft including PMDG 747, MD-11 or other high-sensitivity aircraft, turbulence effects can result in stability problems and potential s-turn autopilot hunting. Both FSUIPC turbulence effects and FSX internal turbulence effects (used by AS and FSX itself) can cause these problems. In order to minimize these harmful effects, it is recommended to minimize/disable turbulence effects in both FSUIPC (if in use) and FSX. 


FSUIPC (if installed and FSUIPC wind smoothing/turbulence effects are enabled) - Edit These FSUIPC.ini settings:
TurbulenceRate=0.5,2.5
TurbulenceDivisor=40,40,80,80

FSX - Edit the following FSX.cfg setting (under [Weather]):
TurbulenceScale=0.500000

 

FSX – Using FSX options, disable all turbulence effects on the aircraft (you may omit this step if you’d like some turbulence effects despite further sensitivity issues).

Note:
These stability issues can also occur without the use of AS, however they can become more apparent using AS’s DWC modes and associated correction of wind parameters.


Recommend configurations:

Using PMDG MD-11, 747 or other high-sensitivity aircraft - For maximum wind aloft realism and smoothing with reduced turbulence effects:
-Follow the above configuration steps to minimize turbulence effects in FSX
-If FSUIPC is installed, disable FSUIPC wind smoothing / turbulence effects
-Use DWC (Direct Weather/Wind Control) within AS Options

 

Using other aircraft not subject to extreme turbulence sensitivity - For maximum wind aloft realism and smoothing with standard turbulence effects:
-Leave FSUIPC/FSX turbulence settings at default
-Use DWC (Direct Weather/Wind Control) within AS Options

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