Engine shutdown sound

[Eagle7907]

I'm not really sure how post this because its mostly all jet aircraft that I've noticed this that has yet to have been addressed. I have 14 years experience like some on this thread of being around jet aircraft. I have noticed that the shutdown volumes are not accurate. The sustained volume of idle and above seems right, but after the command to off the jet sounds go quickly to the level of an operating Dust Buster and go silent way to fast with still plenty of rotation left on the engine. Jet engines, when slowly rotating, start to develop a loud clank or clack noise from fan blades moving themselves on the hub. (can't really explain why) The volume of that sequence seems too low, both canopy open and closed, and is not proportional with the idle volumes. With the canopy open should definitely be much higher in volume, closed is debatable.

 

 

Just an observation of something to improve on to help with the immersion.

[Eagle7907]

 

 

It doesn't go all the way to dead stop rotation, also I think there is another F-16 idling nearby, but you can still hear how loud the engine the guy is turning off is still much louder over time versus what DCS is doing.

Edited February 4, 2020 by Eagle7907

[btd]

Thanks for your report.

All of our and 3d party jets have different volume settings for sounds. Please always indicate the modules in which you see the error.

I will re-check the settings.

But I hope you understand that we can’t use your video as a volume reference. It is shot on camera ( 2008 ) with a built-in volume level compressor.

[mvsgas]

a5BKQY-QLbM

 

 

It doesn't go all the way to dead stop rotation, also I think there is another F-16 idling nearby, but you can still hear how loud the engine the guy is turning off is still much louder over time versus what DCS is doing.

 

The video you provided is of a block 30, You can tell because it has analog flight controls and GE engine RPM gauge. It has a different engine than our DCS F-16 (F110-GE- 100 compared to F110-GE-129). Additionally, since I can't see the tail number, it could have a small intake ( which affects the sound) Also, as you mention, there are other sound in the background that render this video not very useful as a source or example.

 

Jet engines, when slowly rotating, start to develop a loud clank or clack noise from fan blades moving themselves on the hub. (can't really explain why)

 

The "clanking" noise is normally due to the fact that the blades need a certain amount of "freedom", they should be able to mode to some degree.

Briefly talk about it here

video is set to 4:19, just hit play

[Eagle7907]

Engine shutdown sound

 

Ah okay, I knew it wouldn't exactly match, but still it does seem rather lacking when you shutdown in DCS not just one jet, but all of them. That's more or less my point. Maybe the clacking of the fan blades for the A-10s would be proper, or adding it to all that possess this phenomenon? I guess what I'm saying is the shutdown sound seems basic and lacks substance or individuality.

 

Disregard the individuality. Just disproved that below. :)

 

Sent from my iPad using Tapatalk Pro

Edited February 6, 2020 by Eagle7907

[Eagle7907]

Engine shutdown sound

 

Thanks for your report.

All of our and 3d party jets have different volume settings for sounds. Please always indicate the modules in which you see the error.

I will re-check the settings.

But I hope you understand that we can’t use your video as a volume reference. It is shot on camera ( 2008 ) with a built-in volume level compressor.

 

 

 

Well the modules I have are A-10c, Harrier, F14, F16, F18, F5

 

I haven't flown the F5/Harrier for a while so I can't say that it's included in my observations, but everything else applies. Here's my sound levels:

 

 

 

I forgot to add FC3 as well.

 

Quick testing

 

Runway start. Done with canopy open. Idle first before shutdown. On ground.

 

F16- its mildly quiet. Just seems like it gets quiet really fast as it spools down particularly around 40% rpm. That's surprising.

F14- big problem, open canopy sounds exactly the same with it closed. (Might be why I've started this post)

F18- it's a bit better than the F16 but once rpm goes to 8% it's dead quiet nothing that sounds like rotation.

F5- it's about the same as the F18, except at 4% goes quiet.

Harrier- due to its already loud nature, I find no problem here except it goes dead quiet when rpm goes zero. But with fan blades that big, you would think the clank factor would be abundant.

A10C- same as F-5 and Harrier

F15- it's much like the above except it gets really quiet after 10% rpm

A10a-same as F15

 

 

Sent from my iPad using Tapatalk Pro

Edited February 7, 2020 by Eagle7907

[btd]

Eagle7907 many thanks. I'll investigate this a little later and try to improve (except F14 and Harrier, it is 3d-party modules)

 

As for clanking sound - we implemented it on the shutdown of the L-39, because I could hear it personally on a real plane. But this sound was not on the Mig-29 or Su27. I'm not sure about the "Fighters", I didn’t hear their shutdown in person, but judging by videos, there’s no clanking either

 

I also noticed that the “Hear like in helmet” checkbox is turned on. This significantly reduces volume and applies a low-pass filter to the entire sound.

Edited February 7, 2020 by btd

[btd]

Btw, I found our old su-27 engine shutdown record. No compression and a good microphone. You can see on the wave how much the volume drops. There is a noise after (you can see it on picture) and during shutdown - it's external APU, it's not from the jet.

https://www.dropbox.com/s/pfn2woinww98dos/Su27%20Shutdown.wav?dl=0

Edited February 7, 2020 by btd

[Eagle7907]

Engine shutdown sound

 

Eagle7907 many thanks. I'll investigate this a little later and try to improve (except F14 and Harrier, it is 3d-party modules)

 

As for clanking sound - we implemented it on the shutdown of the L-39, because I could hear it personally on a real plane. But this sound was not on the Mig-29 or Su27. I'm not sure about the "Fighters", I didn’t hear their shutdown in person, but judging by videos, there’s no clanking either

 

I also noticed that the “Hear like in helmet” checkbox is turned on. This significantly reduces volume and applies a low-pass filter to the entire sound.

 

 

 

Okay. I’ll try it unchecked. Thanks for pointing that out. I’ll keep digging some more. I’ve flown with some ex F-16 pilots in the past. If I fly a trip with them again or run into them in the terminal, I’ll ask.

 

BTW, from what I’ve been told the D model has more performance than the C. I never expected that. He said it was because it carries less internal fuel. Makes sense, since a human weighs less than 1000~ pounds. I like flying with these guys. The stories they tell!

 

 

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Edited February 7, 2020 by Eagle7907