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Dutch Roll In CS757 and CS777 (Read 842 times)
Bigglesworth
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Dutch Roll In CS757 and CS777
Jan 24th, 2018 at 12:55pm
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I have oscillating lateral movement in my CS757 and CS777 when in autopilot .
I think it is called Dutch Roll. Any help would be appreciated.
Thanks
  

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Markoz
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Re: Dutch Roll In CS757 and CS777
Reply #1 - Jan 25th, 2018 at 1:57am
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Are you flying between OPT (OPTimum altitude) and MAX (MAXimum altitude), according to the VNAV CRZ page (page 2/3)? Or above MAX? If you are flying above the MAX altitude, then you're flying too high for the weight of the aircraft, and a dutch roll is bound to happen.

I always try to fly at an altitude close to the OPT altitude on long haul flights, and generally quite a bit lower on short haul flights. If I'm doing a long haul flight, I often do 2,000 foot step climbs, by climbing to the new OPT altitude once it reaches 2,000 feet above what it was before. i.e. flying at FL340, when that's the OPT altitude at the begining of the flight, then climbing to FL360 when it becomes the OPT altitude, and so on up to the maximum altitude the aircraft can fly at.

Note. Step climbs are normally at 4,000 foot intervals.
  

Mark Fletcher



PC: i7 6700K @ 4.0GHz | Corsair H80i Liquid Cooling | 32GB DDR4 | 6GB GTX1060 Xtreme Gaming | 27" LCD Monitor | 1TB SSD, 1x2TB SSHD, 1x4TB HDD, 1x2TB HDD, 1x275GB SSD | Win 10 Pro 64 - FSX, FSX-SE, P3Dv3.4 & P3Dv4.5
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Bigglesworth
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Re: Dutch Roll In CS757 and CS777
Reply #2 - Jan 28th, 2018 at 2:29am
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The oscillation starts as soon as I engage the autopilot after take off and settle into the climb with the fmc in control.
thanks
  
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Markoz
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Re: Dutch Roll In CS757 and CS777
Reply #3 - Jan 29th, 2018 at 1:39am
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Okay. That's problem then. I'm not sure I can think of what's going wrong to cause that. Sad

Have you tried reinstalling the 757 using the "Run as ad,inistrator" option? You do this by right clicking on the installer, and selecting "Run as administrator" from the list that pops up. It might be worth turning off your anti-virus software, or disabling it's shields (if possible), whn reinstalling.
  

Mark Fletcher



PC: i7 6700K @ 4.0GHz | Corsair H80i Liquid Cooling | 32GB DDR4 | 6GB GTX1060 Xtreme Gaming | 27" LCD Monitor | 1TB SSD, 1x2TB SSHD, 1x4TB HDD, 1x2TB HDD, 1x275GB SSD | Win 10 Pro 64 - FSX, FSX-SE, P3Dv3.4 & P3Dv4.5
15.6" Gaming Laptop: i7 7700HQ | 16GB DDR4 | 6GB GTX 1060 | 256GB SSD & 1TB HDD | Win 10 Pro 64bit - FSX-SE & P3Dv4.5
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