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serviceceiling

Compressor Stall

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A few hours ago I took the -600 for a test flight, where I performed slow-flight and did some steep turns to test the flight dynamics of the NGX in every aspect and situation. During a stall I noticed a popping sound that came from the engines, they stuttered. I guess this was a compressor stall. I found it really amazing that PMDG actually modeled this occurance and included sounds for it, if it's the case.

 

Cheers from Frankfurt.


 

With kind regards, Bogdan Misko.

 

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:o Both the MD11X and the NGX never stop amazing me


Manfred G.

 

Ships are cooler that you think.

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now that is very interesting


Bryan Richards

 

"People depend so much on automation that they forget how to get the automation to work." B.W.

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They're not listed in the failure options. Would be a nice addition if possible. Somehow I don't think so.


Paul Wood

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I'm hesitant to believe compressor stalls are in the sim if only because in the NG it's fairly difficult to cause with the invention of FADEC and engine software.

 

Some programs like FSCaptain will give you an engine flameout in extremely wet weather, but that's as far as I'm sure it'll go.


Rules of Wisdom:
Take-offs are optional, landings are mandatory.
The only time you have too much fuel is when you're on fire.
Your airline can only make a small fortune by starting with an even larger fortune.

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Are you sure that you're not hearing the stick-shaker? Stalling an aircraft doesn't mean that the engines will suffer a compressor stall at the same time.

 

Depending on the quality of sound system you have, it could be that the sound of the stick shaker along with the engines is creating an irregular sound. I had some cheap speakers that couldn't adequately handle a range of sounds all at once and this created such an effect.


Mark Adeane - NZWN
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It was not the stick shaker. Before the test flight I turned off all the warning and safety systems to have full control over the aircraft.

 

I heard the engines stutter. BTW: I did about 3 stalls and this only happended during the third.

I am using REX essential and its weather engine, maybe it has something to do with that.

 

EDIT: I don't have speakers, I run FSX on a HP G62 notebook and I never experienced any sound issues at all.


 

With kind regards, Bogdan Misko.

 

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If it is true it is a great feature, but, can you post a video?

How did you disabled the stall warning/shaker? Through FMC?


Regards

Andrea Daviero

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It was not the stick shaker. Before the test flight I turned off all the warning and safety systems to have full control over the aircraft.

 

Maybe I'm wrong, but I don't know stick shaker turn off button. You can see stick shaker in action by pressing STALL WARNING TEST buttons on after overhead panel while on ground with AC power available. Also 737 is not Airbus with its normal law and flight envelope protection. Just turn off AP, A/T and you will have full control of the aircraft with aural and visual warnings working.

Video would be very appreciated.

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In the real plane the stick shaker can be excluded only by pulling the CBs, however in NGX the fmc menus (failures) could help.

I just finished to test this compressor stall, I was able to have a near to 90° pitch up, with airplane falling down but nothing other than stick shaker and winds. I also searched how to disable stick shaker from menus and I've not found either in the MISC, flt cont or other menus.

I think that more clarification is needed to help us how to replicate or to understand what it was.


Regards

Andrea Daviero

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It is called placebo. You were siting in the best fsx airliner which is 99.995% realistic. Your brain added the remaining 0.005%.


rs.png Vladimir Levkov / Владимир Левков

Two miles of road can take you two miles.Two miles of runway can take you anywhere in the world

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Bogdan, do you have Accu-Feel? That's the only other thing I can think of that might be responsible for the sounds you heard.


Mark Adeane - NZWN
Boeing777_Banner_BetaTeam.jpg

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