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plowry

Autothrottle -- unstable power settings

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When the airplane is flying at a cruising altitude with the autothrottle engaged I find the power settings are frequently unstable. For a period of some minutes all three N1 values range up and down together by as much as 10% if not somewhat more. The N2 and fuel consumption values follow as do the graphically displayed throttles. Much of the time the power is quite solid (N1 of 90% with the GE engines and 79% with the PW engines), but then for some reason it becomes unstable. It appears to occur only when the autothrottle is engaged. I would appreciate knowing whether this is a common problem and, if so, whether there is a fix. Peter Lowry.

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I think the most common reason for the throttle movement in the simulation is wind speed variation. If you try a cruise in clear weather (no weather) there will still be a minor variation in throttle, and I don't know what causes that but large movements are probably the poor wx engine in MSFS. The fix is a registered copy of FSUIPC, which offers wind speed/direction pressure and temperature smoothing. Turn off turbulence, MSFS doesn't do this realistically.


Dan Downs KCRP

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Thanks for your comment Dan. I have all turbulence turned off and I have tried to fix things with FSUIPC smoothing. Perhaps I just have to work with it some more. Any suggestions about the setting for wind smoothing might be helpful. Peter.

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Thanks again. I use Active Sky (Evolution) which has its own wind smoothing and some instruction on how to address weather problems for more sensitive aircraft like the MD-11, but that does not seem to overcome the instability in my power settings. I will try your FSUIPC settings and see what happens. Peter.

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My settings:
Dan,I was searching your wind smoothing set. Unfortunately they removed the attachments. Is it possible if you can load the attachments again.It was very helpful.ThanksThanks

Ahmet Sanal

 

"Time you enjoyed wasting, was not wasted"

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