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Author Topic: PM AT issues found and solution ( throttle hunting and overspeed )  (Read 1346 times)

Offline GSalden

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For years now people are suffering from issues with the PM AT below 11.000ft : speed 10-15 kmnots too high and throttle hunting .
For 3 weeks I have worked on a customized flightmodel. Perfet landing with flare manually but not with Autolanding.

If I wanted to do an Autolanding I had to set the mcp speed 15 knots lower than the matching flaps speeds.
Below 500 ft I set the final flap with Vref - 5 instead of Vref + 5 and the landing then went very smooth. 
 
Bernhard here at Cockpitbuilders found that weather had a great influence on the AT at approach.
If he turned of his weather engine he could make a good autolanding and the aircraft kept the dialed speed instead of throttle hunting and speeds that stayed 10-15 knots above the dialed mcp speed.

I have been testing this too :
•Turbulence Off in the FSX/ P3D menu and no weather engine --> no heavy throttle hunting and the AT keeps the dialed mcp speed
•Weather engine On and throttle hunting occurs 


Solution for now :
•In ASN / Opus :  all turbulence Off ( wind, cloud, wake )
•In Fs  Turbulence Off
•FSX.cfg/P3D.cfg : Turbulence values have to be set to 50% their default value
•In Fsuipc :  surpress guts/windshear/turbulence

These are the same adjustments that were advised just after the release of the PMDG 737 ( S-tuning/up/down pitching at approach ).
Later they made changes to their mcp gauge.

PM never had the issue in Fs2004. Probably as weather injecting was still very basic.
When FSX came out many people had these issues.

Imho PM has turned off turbulence in their simulator as in all flying vids the aircraft never suffers form turbulence.
They probably never thought about the turbulence which other people had set to high values....


The default PM 737-800 does not work correct on my system : overspeed on descent and not the right "737"feeling according to my judgement. I made some adjustments to my custom made airfile regarding drag/lift and now I can make nice Autolandings.
When making a flight I will land manually , but for me everything has to work when if the feature exists.

The last thing I have to do is look into the throttles retard as that does not happen correctly.
With only the onscreen throttles the throttles go back to idle slowly after landing.
When using my motorized Cockpitsonic tq they do not go back to idle at all.

If anyone has the solution for this let me know.
If that has been fixed  too I will upload the total PM 737-800 package for download.

Regards,
Gerard 
« Last Edit: December 04, 2015, 01:51:13 PM by GSalden »

Offline jr2mey

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Re: PM AT issues found and solution ( throttle hunting and overspeed )
« Reply #1 on: August 23, 2017, 11:56:45 AM »
Hello Gerard,

I was wondering if you managed to solve your 737 config issues.  I too use PM with their 737 flight model and have always been experiencing the same issues.

Regards,
James

James

Offline Bob Reed

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Re: PM AT issues found and solution ( throttle hunting and overspeed )
« Reply #2 on: August 23, 2017, 12:22:17 PM »
I too would be interacted in this as I use PM.

Offline Patt737

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Re: PM AT issues found and solution ( throttle hunting and overspeed )
« Reply #3 on: February 01, 2018, 02:00:14 PM »
Hello everyone,

We have been experiencing the same problem since we started p3d v3.
It worked well with the fs9 autopilot.

Can you tell us what are the drag / lift values you have changed.

What new values did you give?

Thank you .

Patt.

Offline Bob Reed

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Re: PM AT issues found and solution ( throttle hunting and overspeed )
« Reply #4 on: February 05, 2018, 08:26:29 AM »
Hello everyone,

We have been experiencing the same problem since we started p3d v3.
It worked well with the fs9 autopilot.

Can you tell us what are the drag / lift values you have changed.

What new values did you give?

Thank you .

Patt.

Mr Saldon has not been on the board since Nov 19th 2016. I do not think there will be an answer from him. :) Anyone else have an answer?
« Last Edit: February 05, 2018, 08:27:06 AM by Bob Reed »

Offline Patt737

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Re: PM AT issues found and solution ( throttle hunting and overspeed )
« Reply #5 on: February 06, 2018, 01:39:36 PM »
Hello,
Thank you for help.
I suspected, but I tried.
I'm going to open another post because I have another question.

Patt

 

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