Add Fuel Tanks to A Plane

[damian_miquel]

Hi everyone, I have been looking to add working fuel tanks to a plane such as the Su-27, which doesn't have them as default, and I was wondering how could they be implemented so that they get drained first like in the Su-25T or the F-15C.

 

Thanks to everyone.

[Northstar98]

The Su-27 IRL isn't fitted for external fuel tanks, and it doesn't have any hardpoints that can accept them.

[damian_miquel]

The Su-27 IRL isn't fitted for external fuel tanks, and it doesn't have any hardpoints that can accept them.

Yeah I know, it just something I would like to investigate and figure out how is coded in the game, just out of pure curiosity more than realism.

[draconus]

Here is your resource:

https://forums.eagle.ru/forumdisplay.php?f=202

[Mike_Romeo]

Hi everyone, I have been looking to add working fuel tanks to a plane such as the Su-27, which doesn't have them as default, and I was wondering how could they be implemented so that they get drained first like in the Su-25T or the F-15C.

 

Thanks to everyone.

I dont think it need fueltanks. I mean it can carry more fuel than a F-15 with 3 full fueltanks

[damian_miquel]

Here is your resource:

https://forums.eagle.ru/forumdisplay.php?f=202

 

Thanks a lot!!

[damian_miquel]

I dont think it need fueltanks. I mean it can carry more fuel than a F-15 with 3 full fueltanks

 

I actually didn't know that :lol:

[Akula]

On 6/5/2020 at 4:40 PM, Northstar98 said:

The Su-27 IRL isn't fitted for external fuel tanks, and it doesn't have any hardpoints that can accept them.

Why not? Just curious. Seems so strange that such a jet can’t be fitted with hard points that accept external tanks.

[PhantomHans]

I'm guessing the Soviets/Russians just haven't found this to be a requirement.

But wasn't there a derivative, SU-30something, that could do drop tanks?

[draconus]

This was a design choice to make huge internal tanks and only use 60% fuel as normal "full" load and other 40% for extended range.

Afaik Su-35S and Su-34 have such capability.

Edited May 28, 2024 by draconus

[Ironhand]

As Draconus notes, it was a design choice. The Su-27 is a huge aircraft, roughly the size of some regional commercial aircraft--a Yak-40, for instance. They decided to have it carry all of its fuel internally. Here's a bit about the internal workings and typical refuelings.

 

Quote

8.2. Workings of the fuel system.
    The aircraft fuel system is designed to provide fuel to the engines in all modes of operation, as well as various cooling units, aircraft systems modules and equipment.
    The fuel system is operated on RT, TS-1 fuels or a blend in any proportions. The fuel is placed in the No. 1 and 2 tanks in the center fuselage, in tank No. 3, consisting of two compartments located one each in the wing sections, and tank No. 4, located in the rear fuselage between the engine compartments.
    The operational available capacity of the fuel tanks (at γ=0.785):
- Tank No. 1 --3180 kg;
- Tank No. 2 --4160 kg;
- Tank No. 3 --1060 kg;
- Tank No. 4 --1000 kg;
- TOTAL         --9400 kg.

                 
                                    
                                   Fuel tank location diagram.

 

    8.2.1. There are several possible variations for refueling the aircraft: complete, basic, and partial.  During a basic refueling, only Tanks 2 and 3 are refilled. A complete refueling refills all tanks. Refueling is undertaken by the “closed” method-either pressurized or open-through the filler mouth. For a partial refueling, Tank 2 is completely filled by the open method (with visual monitoring) or to at least 3400 kg (as indicated on the fuel gauge). Fuel from the tanks is automatically processed through the supply compartment in Tank 2. The sequence in which fuel is drawn from the tanks is regulated by the STR7-2AK fuel metering system.
    Fuel is drawn from the tanks in the following sequence:
    When fueled completely:
        - 1720 kg from Tank 1;
        - the entirety of Tank 4;
        - the remainder of Tank 1;
        - 70 kg from Tank 2;
        - the entirety of Tank 3;
        - 3210 kg from Tank 2, except for the feed chamber;
        - the entirety of the feed chamber in Tank 2.
    
For a basic refueling:
- completely from Tank 3;
- 3210 kg from Tank 2, except for the feed chamber;
        - the entirety of the feed chamber in Tank 2.

    The specified sequence for drawing fuel from the tanks is for the non-afterburning regimen of the engines.