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Old 01-29-2014, 08:56 PM   #1
Bourrinopathe
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Question Su-27 instruments functions (?)

Hi,
As I'm currently learning how to fly the Su-27, I became more curious about the instruments.
Some of them are not described in the manual, even if they are on the front console and then probably quite important.

I know it's not a DCS level simulation and I don't expect a high level of detail, but I was scratching my head, thinking about those little things under my nose.

And I finally found a few things. Like these little gauges I was wondering about:

(I annotated the image in green)

I guess that indicator is for the intake mesh panels position?

Could anyone confirm?

I searched for some clues in the forum first, tried to download the FC3 russian manual, and finally dug the internet with a translator and a cyrillic-latin transliteration tool.
I also wanted to know the russian name for the instruments.

Anyway, I found this interesting document about the Su-27 systems.
>>> Download page with a tiny preview (russian .doc w/ pictures/schematics) <<<
(it's ugly at first but very informative)

I was also reading the Su-27SK 'Flight Manual' (with an ugly automated translation) and it shades some light on things like these (not familiar to me):


It's probably familiar to most of you, but if you have any information, link, post, about the main instruments for the Su-27, please feel free to share your findings.

And sorry if there's already something about the flanker's instruments somewhere in the forum. I just couldn't find any answer.

Cheers.
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Old 01-29-2014, 11:07 PM   #2
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Hi, maybe for you it´s easier to translate from Spanish to English.

Here is my Su-7SK Manual translated and extended for a better and more comprehensive read.

Hope this help you.

http://www.cruzdesanandres.com/mater...ual_Su27SK.pdf

About your questions you are almost right with everything.

First Panel is the Brakes Pressure indicator for left and right channel and the air pressure indicator. Next is the Test Button of the panel and the left and right hydraulic channels indicator.

The other image is the IPK-2-02-A Intake Protector Covers Position Indicator.
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Last edited by Esac_mirmidon; 01-29-2014 at 11:14 PM.
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Old 01-30-2014, 01:51 AM   #3
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Quote:
Originally Posted by Bourrinopathe View Post
I guess that indicator is for the intake mesh panels position?

Could anyone confirm?
No the illustration is incorrect - don't know where the "ПАНЕЛИ" label comes from .

The real instrument is labelled: "КЛИН" (see attached image), which could be translated to "wedge".

Inside the intake ducts there is an adjustable wedge that regulates airflow to the engines. The wedge slows down the air flowing to the engines to prevent compressor surge - i.e. basically the faster you go the narrower the passage in the duct.

The instrument indicates the position of the wedge in procentage of extension - i.e. "100" meaning 100% extension, which would be in supersonic flight(in the MiG-29 its above Mach 1.5), with 0% at landing/take-off(or taxiing/engines running idle on the ground).

So the instrument has nothing to do with the position of the FOD screens.

However, in the MiG-29 the instrument has an extra indication above the "100" that reads "ВП"(see second attached image) that indicates wedge/ramp configuration when intake FOD doors are closed and air being breathed through auxilllary intakes(in the LERX) during take-off/landing.
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Old 01-30-2014, 05:57 PM   #4
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English term is 'intake ramp'

Quote:
Originally Posted by Alfa View Post
Inside the intake ducts there is an adjustable wedge that regulates airflow to the engines. The wedge slows down the air flowing to the engines to prevent compressor surge - i.e. basically the faster you go the narrower the passage in the duct.
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Old 01-31-2014, 10:24 AM   #5
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Quote:
Originally Posted by GGTharos View Post
English term is 'intake ramp'
I know GG, but in the Luftwaffe manual describing the intake ramp system for the MiG-29, they use both "ramp" and "wedge" - i.e. that the system consists of two "ramps"(a forward and a rear) forming a "wedge".

Subsequently describing the functionality through varies flight regimes, they refer to "wedge angle" and "wedge extension" ......and the latter is exactly what the instrument in question is indicating
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Old 01-30-2014, 07:19 AM   #6
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Thanks a lot, Esac_mirmidon!

That manual is of tremendous help. So much details with photos, schematics and even videos will provide an excellent knowledge base.
And it will be easier to translate, indeed (I'm a french native speaker).

And, yes, Alfa, thanks for the correction and details. I was confused about that wedge indicator. At first I translated it from 'КЛИН' (klyn) from a screenshot I took, then did some research but I didn't find anything, except some photos.

I've only found that 'panely' label on that drawing from the manual I linked. I couldn't find it anywhere else, even if I searched for some similar indicator in different aircrafts (MiG-29, Mig-31), but they're identical (klyn).
The following intake schematic confirms the wedge is linked to a motion sensor (ДП-111Е) described > here <.
Of course I tried to test it in FC3 but it's not simulated (yet?).



Another instrument I was unable to find, even in the excellent manual provided by Esac_mirmidon (or I missed it), is that one (next to the SPO-15 "Beryoza"):



another similar gauge I found:


Maybe because it's a common instrument?
It should measure the cabin pressure differential (перепад давлен) (from -0.04 to +0.6 kg/cm²) and report the elevation (высота) (from 0 to 20 kilometres).
(with 1 kg/cm² ~= 1 bar ~= 14 psi)

(I assume the pressure differential value should increase at high altitudes and probably never decrease significantly in relation to the structural strength of the cabin?)
(not simulated in FC3) (yet? )

Anyway, all those informations are very interesting and learning about the Su-27 systems is a real pleasure, thanks to Eagle Dynamics precision and cockpit fidelity.

Thanks again for your help guys! Very much appreciated!

I'll try to report back if I happen to find/learn something valuable/interesting (or probably with more questions).
And I hope that will be useful to other simmers.

Last edited by Bourrinopathe; 01-30-2014 at 07:25 AM. Reason: spelling
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Old 01-30-2014, 08:54 AM   #7
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You are right Alpha. I was confusing the intake air flow wedges with the grid protection covers. Thanks.

The cockpit pressure indicator you are showing is a different model with the same function you can see in the manual. Please take a look at it because it has the same objective.
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Old 01-30-2014, 12:39 PM   #8
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This indicator shows at the upper side the altittude pressure inside cockpit sustained by the cockpit pressure system. The lower side shows the pressure difference between outside and inside cockpit.

In the manual you would find a different indicator with the same system and also a O2 indicator and a air efficience system indicator.

Su-27 cockpits are a little different in some instruments and dials taking in count versions, retrofits, manufacturers, etc.

This dial is an example.
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Old 01-30-2014, 05:41 PM   #9
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@ Esac_ Mirmidon,

This is a fantastic document you made!!

Downloaded the Pdf, but i can't copy paste in Google translate.

Is there any chance to have translation in English?

I think the whole community will thank you for that

At the moment i'm considering to make my cockpit DCS ready (if ever)
That means every switch has to work

My cockpit:

http://forums.eagle.ru/showthread.php?t=21664&page=49

Your document is very helpful in this!!

Thanks in advance!

Cheers!

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Old 01-30-2014, 05:50 PM   #10
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Here you have an unprotected copy.

The translation work from russian to spanish was HUGE, so i don´t have brain left to do again into english ...

Su-27SK

Very nice cockpit Wasserfall. You are very talented.
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