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Yaw Damper Investigation

 
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MarkHastings



Joined: 18 Jan 2006
Posts: 798
Location: UK

PostPosted: Tue Jan 09, 2018 1:34 pm    Post subject: Yaw Damper Investigation Reply with quote

I've had a couple of reports of an overly sensitive yaw damper.
I've been investigating and have reduced the sensitivity.

If you are seeing a slightly twitch aircraft in yaw...
Edit : \Server\FSX-Sim-Avionics-B737.CFG
Find the [AUTOPILOT] section and replace with the values below.

I've been test flying and it's been flying really well here but this might not be 100% the solution.

If you do have yaw control problems please can you :
Ensure the Server > Flight Controls > Turbulence is OFF

If you still encounter a problem then switch off the Yaw Damper, and/or stop any addon weather program.

This will help to track down the cause.

Thanks

Code:

[AUTOPILOT]

// Autothrottle
AT_SENSITIVITY_REDUCTION=1.1
AT_DAMPING=1.1
AT_CHANGE_RATE=0.12

// Thrust Reference
AT_THR_REF_P_FACTOR=20000
AT_THR_REF_I_FACTOR=0.1
AT_THR_REF_D_FACTOR=-14
AT_THR_REF_LVL_REDUCTION=8
AT_THR_REF_LVL_REDUCTION_RATE=0.002
AT_THR_REF_ACCEL_REDUCTION_CONTROL=90

//Flight Level Change
FLCH_SENSITIVITY_REDUCTION=6
FLCH_DAMPING=2
FLCH_AGGRESSION=6
FLCH_AGGRESSION_DOWN=5
FLCH_ACCELERATION_DAMPING=0.7

//Heading
HDG_TURN_GAIN=1.4
HDG_ROLL_SPEED=14000
HDG_ROLL_STABILIZER=-0.004
HDG_MAXIMUM_BANK_ANGLE=30
HDG_ROLL_ACCEL_SCALAR=10000

// LNAV Off Track Capture
LNAV_TURN_ANTICIPATION=0.8
LNAV_AGGRESSION_SMALL=1

// LOC
LOCALIZER_SENSITIVITY_REDUCTION=5.5
LOCALIZER_DAMPING=0.15

// GS
GLIDESLOPE_CAPTURE_AGGRESSION=12
GLIDESLOPE_DAMPING=24

// V/S
VS_SENSITIVITY_REDUCTION=1.6
VS_DAMPING=0.5

// ALT HOLD
ALT_SENSITIVITY_REDUCTION=1.5
ALT_DAMPING=0.5
ALT_CAPTURE_AGGRESSION=4
ALT_PITCH_DAMPING=-1000
ALT_SCALE=1.0

TAC_SENSITIVITY_REDUCTION=5
RUDDER_DAMPER=100
AUTO_RUDDER_SENSITIVITY_REDUCTION=5

AUTOBRAKE_SCALAR=15

// Flight Directors
FD_PITCH_VS=0.003
FD_VS_DAMPING=0.2
FD_PITCH_ALT=0.005
FD_ALT_DAMPING=0.2
FD_PITCH_GS=0.004
FD_GS_DAMPING=0.2
FD_PITCH_FLCH=0.003
FD_FLCH_DAMPING=0.002
FD_PITCH_ACCEL_SCALE=-1.0
FD_PITCH_SPEED=280
FD_BANK=1

CWS_ROLL_SENSITIVITY_REDUCTION=0.2
CWS_PITCH_AGGRESSION=0.0005
CWS_ROLL_AGGRESSION=0.0004
CWS_PITCH_CONTROL=800
CWS_PITCH_SENSITIVITY_REDUCTION=3
CWS_PITCH_DAMPING=0.3
CWS_ROLL_DAMPING=2000
CWS_ROLL_CONTROL=1500
ROLLOUT_SCALAR=800
ROLLOUT_DAMPING=33
FAKE_ASYMTHRUST_SCALAR=1
FAKE_STALL_DROP_SCALAR=8

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Mark Hastings
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Sim-Avionics
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Jean Louis



Joined: 12 Jan 2015
Posts: 106
Location: France

PostPosted: Tue Jan 09, 2018 2:31 pm    Post subject: Reply with quote

thank you Mark my plane was completely uncontrollable, I hope it will solve my problem
JL
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Rigilkent



Joined: 02 Aug 2017
Posts: 34

PostPosted: Tue Jan 09, 2018 4:22 pm    Post subject: Reply with quote

Does this only apply to the B737?
or to B777 as well?
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Andrea
Jetmax 777
FDS-MX-OH
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MarkHastings



Joined: 18 Jan 2006
Posts: 798
Location: UK

PostPosted: Tue Jan 09, 2018 6:21 pm    Post subject: Reply with quote

I think only applicable to the 737.
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Mark Hastings
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jemac3



Joined: 01 Jun 2016
Posts: 34
Location: Arizona

PostPosted: Tue Jan 09, 2018 8:15 pm    Post subject: Reply with quote

Mark,
Applied the edit and it seems to have resolved my issues no more rolls and crash dives....! will continue to test

Thank You,
Jimmy Mac
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Jean Louis



Joined: 12 Jan 2015
Posts: 106
Location: France

PostPosted: Wed Jan 10, 2018 3:21 am    Post subject: Reply with quote

Mark
i changed the values ​​in the autopilot file and now the plane is perfectly stable thanks again
JL
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Jean Louis



Joined: 12 Jan 2015
Posts: 106
Location: France

PostPosted: Wed Jan 10, 2018 4:07 am    Post subject: Reply with quote

correction Mark after an hour of flying about the plane became unstable I was forced to cut the yam damper sorry....
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MarkHastings



Joined: 18 Jan 2006
Posts: 798
Location: UK

PostPosted: Wed Jan 10, 2018 7:56 am    Post subject: Reply with quote

Jean Louis...
hmm. Well that makes no sense.... it should either work or it won't.
I can't imagine why the system would get tied and give up after an hour ! Wink

Please can you ensure that you have enabled the "Infinite Battery" checkbox in the FSUIPC > Misc tab.

Also, goto the Windows Device Manager and check in the Properties of each of the USB HUB items. Goto the Power Management tab and Deselect the Power Management checkbox.
This will prevent your USB devices going into powersave mode.
You will need to this on all of your computers.
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Mark Hastings
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Jean Louis



Joined: 12 Jan 2015
Posts: 106
Location: France

PostPosted: Wed Jan 10, 2018 10:25 am    Post subject: Reply with quote

Mark you're right I had a problem on the server page with the data send loop and rate below 3 until the end of the flight so I think the problem came from that
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Jean Louis



Joined: 12 Jan 2015
Posts: 106
Location: France

PostPosted: Thu Jan 11, 2018 3:24 am    Post subject: Reply with quote

hello Mark
second test today no problem for the duration of the flight
JL
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fox956



Joined: 05 Jan 2010
Posts: 67

PostPosted: Fri Jan 12, 2018 5:45 am    Post subject: Reply with quote

Hi Mark,

I did as you mentioned and after doing so I didn't have the YAW or Autopilot problems I have been experiencing prior to the changes you suggested. I only was able to do 1 takeoff last night, more is needed of course, I will report back with my findings.

Larry
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MarkHastings



Joined: 18 Jan 2006
Posts: 798
Location: UK

PostPosted: Fri Jan 12, 2018 7:35 pm    Post subject: Reply with quote

A quick update on this investigation.

I have been testing today and I believe I’ve found the reason and a solution.
I’ll run some more tests over the weekend and post a fix next week.

Just to re-iterate, if you do currently have a Yaw control problem, the temporary fix is to switch off the Yaw Damper.

Thank you for your patience.
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Mark Hastings
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ehmjo



Joined: 06 Dec 2017
Posts: 3
Location: The Netherlands

PostPosted: Sun Jan 21, 2018 9:50 am    Post subject: Reply with quote

Thanks Mark,

I think I have the same/similar problem with the 777.
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Happy Landings!

Eric
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gsumner



Joined: 06 Feb 2016
Posts: 114
Location: WSM UK

PostPosted: Tue Feb 06, 2018 7:49 am    Post subject: Reply with quote

Hi,

Has the fix been issued ? I'm flying with the yaw damper off at the minute so its no big issue but if there's a fix available id be interested in incorporating it.

Thanks
Graham
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