Su-27 instruments functions (?) - Page 9 - ED Forums
 


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Old 01-19-2015, 07:13 PM   #81
Bourrinopathe
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Here's the fuel gauge warning lights with the corresponding fuel levels:



And that's the note next to the HDD:



I only tested the first warning light and it's on with 5014kg left (not 5590kg as suggested in the note).
(Su-27 for DCS 1.2.14)

UPDATE: the in-game values are:

Бак 4,1....5014 kg
Бак 3.......4004 kg
1.5...........1504 kg
Бак 5.......1004 kg
0.6.............604 kg

Based on the Su-27SK manual, there should be 4 fuel tank groups:


Схема расположения топливных баков
Quote:
− tank number 1 - 3180 kg; (forward integral fuel tank)
− tank number 2 - 4160 kg; (centre-section integral fuel tank)
− tank number 3 - 1060 kg; (wings integral fuel tanks)
− tank number 4 - 1000 kg; (aft (boom) fuel tank)
TOTAL - 9400 kg.
(that's about 12000L with an average kerosene density of 0.785kg/dm³)
The Su-27 has a rather precise fuel consumption sequence elaborated to preserve its maneuverability/balance (Center of Mass (CM)) (depending on the initial fuel quantity):
Quote:
With 9400kg fuel, the sequence is:
− 1720 kg from the tank 1;
− empty tank 4;
− empty tank 1;
− 70 kg from tank 2;
− empty tank 3;
− 3210 kg from tank 2, except (consumables compartment? --> расходного отсека);
− empty tank 2 feed compartment
Based on the sequence, the first warning light is on when the tanks 4, 1 and most of the wings tanks are empty (tank 3).
On the fuel gauge, the lights do not exactly correspond to an empty tank (=Бак):
  • Б4,1 probably stand for Бак 4 and 1 (9400-5014=4386kg --> Su-27SK tanks 1+4=4180kg | that's close enough )
  • Б3 obviously stands for tank 3 (5590-4430=1160kg (using the note | close to the Su-27SK manual (1060kg)))
  • 1.5 is the 1500kg warning (+ vocal warning message)
  • Б5 (880kg warning (note)) should mean there's a tank 5 (?) there's a 800kg vocal warning message too.
  • 0,6 is the bingo fuel last warning (w/ vocal warning message and bingo fuel vocal message)

The fuel measurement has an accuracy of ± 170 kg.

Game/sim-wise, it's pretty straight forward and there's really no problem using that gauge. The fuel is burning, the light goes on, ok there's roughly that fuel quantity left. Done.

But I'd like to know if there's a specific known structural fuel system schematic for the Su-27S?
Or if anyone could confirm there's a tank 5?
(or what it means) (I'm curious)

And if you have the exact value for the fuel quantity left for each warning lights, please do share (values added above)

Any detail would be appreciated.
Thanks!
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Last edited by Bourrinopathe; 03-22-2015 at 03:14 PM. Reason: more data in the data ;)
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Old 01-20-2015, 11:11 PM   #82
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Great work as always.

i love the professionalism point of view you always use.
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Old 04-27-2015, 04:56 AM   #83
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Quote:
Originally Posted by Esac_mirmidon View Post






wow awesome!

Does it specify anywhere which type of autopilot is enabled when the trigger is pressed? E.g. is the autopilot level is refering to either transition to level flight or if it was supposed to be altitude roll and hold?

Last edited by FlyingHighAU; 04-27-2015 at 05:00 AM.
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Old 04-27-2015, 01:55 PM   #84
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Quote:
Originally Posted by FlyingHighAU View Post
Does it specify anywhere which type of autopilot is enabled when the trigger is pressed? E.g. is the autopilot level is refering to either transition to level flight or if it was supposed to be altitude roll and hold?
If I'm not mistaken: neither of the two.
The autopilot trigger is used to briefly disengage the current autopilot mode(s) (barometric altitude, …) when pressed (and held), to let you adjust the new flight parameters (altitude, attitude, …) and re-engages the previous modes when released.

It acts like a quick bypass and adjustment command.

Here's the original text if you want to translate it:

Quote:
4.13.2. Совмещенное управление самолетом.

Для изменения положения самолета при включенной автоматической стабилизации (горит сигнализатор АВТОМ, а при стабилизации Нбар и Нрв горит сигнализатор Нбар или Нрв), необходимо:
− нажать гашетку совмещенного управления на ручке управления самолетом, при этом управляющие сигналы из САУ в СДУ не поступают, индикация режимов Нбар и Нрв снимается (сигнализаторы гаснут);
− управляя самолетом вручную, установить требуемое угловое положение в пространстве и нужную высоту;
− отпустить гашетку совмещенного управления, при этом возобновится режим стабилизации новых значений параметров полета и загорится сигнализатор того режима, при котором была нажата гашетка совмещенного управления.
При углах крена и тангажа более 80° после отпускания гашетки совмещенного управления происходит отключение САУ, при этом на приборной доске высвечивается сигнал УПРАВЛЯЙ ВРУЧНУЮ.
Отключить САУ при нажатой гашетке совмещенного управления можно кнопкой СБРОС или кнопкой ОТКЛ САУ.
(Совмещенное управление = combined control)

(the Transition to Level Flight mode is activated by pressing the button to the right, labelled: ПРИВЕД К ГОРИЗ - "Autopilot level" on the picture you linked)
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Last edited by Bourrinopathe; 04-27-2015 at 02:02 PM.
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Old 04-27-2015, 02:08 PM   #85
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The auto level button is the famous "panic button".

This button allows the pilot to automatically recover the horizontal and level flight both in pitch and roll in a disorientation situation or when loosing situational awareness in IMC.

Auto pilot off is the other SAU off function while pressed to fix the flying attitude and alow the SAU to keep it when released.
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Last edited by Esac_mirmidon; 04-27-2015 at 03:11 PM.
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Old 04-27-2015, 06:17 PM   #86
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There seems to be no hat on the stick for slewing the cursor over targets. Any idea on how that is done?
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Old 04-27-2015, 07:04 PM   #87
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It's wrongly labelled "radar skew" I guess...
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Old 04-27-2015, 07:20 PM   #88
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If that's the case, how is the radar skewed?
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Old 04-27-2015, 08:52 PM   #89
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Radar Slew is a HAT. "Skew" is a mistype by me.
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Old 04-27-2015, 10:24 PM   #90
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The radar slew stick works like a non centering joystick if I'm not mistaken..?
The position of the radar slew refers to a position on the HUD.

Anybody knows this for sure?
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