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CaptCraig

Weirdly shaking engines

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Hey Guys,

 

Love the plane. I think it may be my special effects settings but I've noticed the engines shaking but it's not smooth.  Kind of jumpy. Do you know what I mean? Anybody else experiencing that? I may have missed the page in the manual about optimal P3D settings.

 

 

Craig

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Hi Craig.  A couple things...

 

1.  Page 101 in the PMDG 747 Introduction PDF describes the setting available to you for enabling/disabling 5 types of "shaking" built in to the 747 QOTS.  The settings are found on the CDU under MENU/PMDG SETUP/OPTIONS/SIMULATION/PAGE 9/10.  Suggest you experiment with these to see if it changes the engine shaking behavior you're experiencing.

2.  If you have EZDok v2.0 installed, it also injects "fuselage" and "camera" shaking.  Suggest you disable these and then work with one system at a time to see which helps improve the behavior.

 

Blue skies!

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 If you have EZDok v2.0 installed

 

It's not ezdok as I have that turned off with the Queen and I do have all the shakes enabled in the FMC.  This is the nacelles engine shake. It's very abrupt and not very smooth. It may be a setting in P3D but I'll have to go through the intro manual again and browse through the info.  

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It's not ezdok as I have that turned off with the Queen and I do have all the shakes enabled in the FMC.  This is the nacelles engine shake. It's very abrupt and not very smooth. It may be a setting in P3D but I'll have to go through the intro manual again and browse through the info.  

 

What are your frames like?

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What are your frames like?

 

Anywhere between 30 and 20 maybe a bit lower for short periods in a heavy scenery situation. What frame rate would you start seeing these artifacts? 

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What frame rate would you start seeing these artifacts? 

 

Not sure, but the lower the frames go, the more jerky you'll see it (potentially).

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Not sure, but the lower the frames go, the more jerky you'll see it (potentially).

OK I'll keep an eye out for it again. Are my special effects settings OK at Medium you think? That matter at all in this case? 

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I've noticed this same issue today. My frames aren't great though so that may be some of it. My ASN has been crazy with the turbulence lately. I have gotten bad turbulence on every flight I've done regardless of aircraft. I will say I LOVE the shaking in the cockpit. That, coupled with the sounds it makes while shaking, really makes me feel like she is getting beaten up by the turbulence. Outstanding job on that!

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Craig/Ken,

 

We had a couple of reports during beta testing that seemed to indicate FSX wasn't bothering to animate the pylon flexing until some random time after the sim is launched... and this would cause the engines to suddenly shiver like a dog shaking off water.

 

We saw it once... but weren't able to duplicate it.

 

If you notice a pattern to it, let me know and I'll dive into it a bit.

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I also have the odd shaking of the engines.. I made a video of it happening..

OMG and RR's description matches the behavior exactly! :lol:   Weird.  I have not had much time with her...but I have not seen that in the P3D version so far....so maybe limited to FSX like you theorize Robert?

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I saw this once on taxi out at YSSY on my first flight, but it has not done it again. The engines kinda jumped and wiggled like crazy for a few seconds, then back to normal for the whole flight.

 

Will see if it happens again.

 

This was in P3D

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Nameless (above- who just got warned for failure to comply.  LOL)

 

That is precisely what we saw.  Couple questions:

 

1) Can you replicate it?

2) If yes, how?

3) Did it eventually damp down, growing less and less until it stopped?  OR: did it grow larger and larger until it stopped?

 

Trying to figure out which way the oscillation equation might be running away....

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so maybe limited to FSX like you theorize Robert?

Nah I'm getting it in P3d, but it doesn't last as long as the video. I've noticed it once during pushback and once while they were at 50% N1 before TO/GA.  Strange eh? Robert's description is perfect. It's like your Mom's 25 year old washing machine during the spin cycle. 

 

Nameless (above- who just got warned for failure to comply.  LOL)

 

That is precisely what we saw.  Couple questions:

 

1) Can you replicate it?

2) If yes, how?

3) Did it eventually damp down, growing less and less until it stopped?  OR: did it grow larger and larger until it stopped?

 

Trying to figure out which way the oscillation equation might be running away....

 

Going to try to replicate. It doesn't seem like one of those things where you can replicate it though. Seems random (but obviously there's nothing random with software).

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(but obviously there's nothing random with software)
Cough cough... have you met Windows 10... and Vista for that matter... I deal with random, unreproducible software problems daily. Its no fun.
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random, unreproducible software problems

 

I meant random like a flight attendant texture popping in to ask if you want coffee random. That would be very weird and random.  

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So it happened again to me.  Once when lining up for the active.  Again once 50% N1 set.  They all wiggled for a good 3-4 seconds, but not like the good wiggle I think we're looking for, the wet dog wiggle.  Apart from that info I'm not sure what else to give you.  Try some testing at 50% N1?

 

I'm in the GE engine type.

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I also had the same issue on FSX. It happened for me during pushback. Never saw it happen again after that. Was also flying the GE engine. Will try the other engine types tonight and see if it happens again.

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Same happens with the RR using SE. Noticed it while on the ground only. Haven't seen it in the air. Seems to shake for a few seconds at random then stop, then reappear a few minute later. This happens repeatedly during ground ops (at least that's when I was watching).

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Hello Guys..

 

I am sorry,  what is a signature block?   I forgot to post my name.. Jason.  How do I make a signature block?  Don't want to break any rules.  =)

 

BTW, my set up is a windows 7, FSX, and I was doing a loading process in Las Vegas.  The only time I got the engines to shake was when I doing the loading process. 

 

Jason

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Hello Guys..

 

I am sorry,  what is a signature block?   I forgot to post my name.. Jason.  How do I make a signature block?  Don't want to break any rules.  =)

 

BTW, my set up is a windows 7, FSX, and I was doing a loading process in Las Vegas.  The only time I got the engines to shake was when I doing the loading process. 

 

Jason

Just go to the top right of the screen and select your username->'My Settings'->'Signature' from the menu on the left. 

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I can confirm this is happening to me as well. The engines go into seizures for a bit, but I haven't really been able to pinpoint what causes it. Frames are good; well above 30.

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OMG and RR's description matches the behavior exactly! :lol:   Weird.  I have not had much time with her...but I have not seen that in the P3D version so far....so maybe limited to FSX like you theorize Robert?

Confirm is in P3D maybe worse.Thought wow...it is heat shimmer but then I moved the view and realised it was not.

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I also have the odd shaking of the engines.. I made a video of it happening..

 

I experience this exact thing nearly every time after setting the parking brake. Not exactly at the same time, but after a flight and after the ac is stopped. More than once it was engines 1 & 2 and once it was all but #1. Weird...

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Gents,

 

Thanks for the feedback.  Still looking on our end.

 

We have a few bigger fish to fry, so this is lower priority because it is just a visual anomaly.  It is logged in our system for continued research tho.

 

I SUSPECT that the vibration mechanics are running out of limits and we we are seeing is that as the damping factor takes hold it slowly swings the vibration back into limits later and creates the vibration again...

 

Gonna have to keep digging...  I'll find it tho.  I always do.  :Hmmmph:

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