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L-39ZA drop tanks.


Kazansky222

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Maybe somebody else know how they draw fuel out of them my guess is that this is setup by the ground crew. Like opening valves at the hardpoints.

 

 

But you can Definitly see that they are empty as soon as the Fuel gauge starts to show less than full.

 

 

In most eastern designs external fuel tanks have always draw priority and they fill the internal fuel tanks faster than they can be empty by the engine…

 

 

Oh and before you ask where it is shown how many Ammunition you have left onboard. The answer would be you have to look outside.

 

:)

"Blyat Naaaaa" - Izlom

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This is how it works in ZA, assuming you have all the tanks full, including drop tanks:

 

 

1. Fuel is being drained from the internal tanks and the fuel indicator shows remaining fuel in them.

 

2. Once fuel in the internal tank drops to ~600KG, valve opens to allow transfer from drop tanks to internal tank. At this stage, fuel indicator shows ~600KG the entire time, because the drop tanks are feeding the main fuel tank, keeping it at that level.

 

3. Drop tanks are depleted and the caution light shows up.

 

4. Wingtip tanks are now feeding the internal tank, indicator is still at ~600KG!

 

5. Wingtip tanks are depleted and another caution light shows up.

 

6. Internal tanks are now being drained further and fuel indicator will show remaining fuel available.

 

 

 

Basically, the engine is being fed from the internal tanks and drop/wingtip tanks are there to keep it at 600KG until they're empty.

 

Also note that the drop tank circuit breaker in the cockpit will ONLY control the warning light operation. You can't influence the transfer from external tanks in any way.


Edited by GeorgeLKMT
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