DC-8 version 3 problem

[TrevorS 4]

Hi Michael

The oscillation problem at CRZ has not been resolved in v3. As I said in another post, CRZ is very stable up to and including FL350. Once you go higher, the oscillating problem presents itself and is most annoying. Could you please look into this matter again - it's not linked to low speeds but to high altitudes. Would be much appreciated.

Regards

Trevor

[AAC47 16]

Hi TrevorS....

 

I found info about this in AEROPLANE FLIGHT MANUAL DC-8  chapter "STANDARD PROCEDURES"

 

03. STABILITY AT HIGH ALTITUDE

For all jet aircraft flying at high altitude, the damping of

the long period oscillations is rather weak, causing speed

and altitude variations which may result in difficulty in

maintaining an accurate flight path. Although the aircraft

is quite stable under all flying conditions, the autopilot

and the altitude control should be used for optimum per-

formance

 

If You will take your tim to read more about this I have attached the page

and try the "Trim Procedure" if you dare...:))

IMG_20200622_0001.pdf

[TrevorS 4]

With all due respect, I have seen a video of a MK airlines DC-8 flying absolutely stable at 37,000 feet.

I am still waiting for Michael to respond.

[TrevorS 4]

It's been a whole SEVEN days now and no response or acknowledgement from aerosoft!!!

Is there a problem?

[Mathijs Kok 39212]

Check your email.

[Michael2 234]

I will take a look at this.  During development I used the recommended cruise altitudes in the performance document and typically did not use loaded weights low enough to get into FL370 or similar.

[TrevorS 4]

Michael, please keep us updated on this one.

Regards

[TrevorS 4]

Any news ?

[TrevorS 4]

Once again, any news on this?

For goodness sake, please answer our questions!!!!!

[Michael2 234]

I discovered the issue for this and I'm giving you a link to a new file directly so you don't have to wait for this to go in the updater system and to get some feedback before it does.  Replace the logic.xml file in the panel/DC81 folder.  This is for P3D only -- I'll post the same for FSX in a moment.  As always, it's a good idea to back up the original just in case.

https://drive.google.com/file/d/1iTqdjlnl672BiuvWEUa7gNHOXi8f8zN7/view?usp=sharing

[Michael2 234]

Here's the link for FSX.  I had to give the file a different name so after downloading change the name to logic.xml (get rid of the (1)).  

 

https://drive.google.com/file/d/1PJPUxhJH0azVKzzwIHecgt28N2ugHkgq/view?usp=sharing

[TrevorS 4]

Thanks Michael. Will try it later.

[TrevorS 4]

Thanks again Michael. Whatever you did corrected the problem. The aircraft is now rock-solid at FL390. Much appreciated.

Will test other flight levels as well.

[Michael2 234]

No problem.  Thanks for letting me know it works at your end.