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Posted (edited)

The fuel tanks are evenily filled when requesting a refuel, but the aux fuel tank should only be filled when the main tanks are full.

To reproduce:

1. Defuel to 50%
2. Refuel to 60%

Aux fuel tank now contains fuel, but all it's fuel fits into the main tanks.

Related: When putting a non maximum fuel load into the mission editor, the tanks are equally drained, but the aux tank should be empty first.

To reproduce:

1. Put an apache with 50% in the mission editor
2. Check fuel levels

Aux fuel tank contains fuel.

Also related: Fuel starts with imbalance when aircraft not 100% full in ME.

Track attached.

In the track file the aircraft starts with 60% fuel. You can see the aircraft pumping fuel for 13 minutes from the aft tank to the forward tank because it starts imbalanced. You can also see the aux tank having fuel, despite all it's fuel can fit into the other tanks. You can see that while refueling, the ground crew pumps fuel into the IAFS as well as the other tanks despite the other tanks being able to hold the fuel they pump into the aux tank.

Correct behavior: Fill the aircraft so it's trimmed from mission start or from refueling. Fill aux tank only when other tanks are full.

 

low_fuel_start_and_refuel_to_IAFS.trk

Edited by FalcoGer
  • ED Team
Posted

The current behavior is correct.

Technically, it was common procedure to fill the aft tank and IAFS at the same time, and then when the aft tank was full the flow would be switched to the forward tank while the IAFS was topped off. In fact, it was specifically not done the way you suggest to avoid the risk of complications within the fuel system. But since there is no way to selectively fill individual tanks in DCS, the method of refueling all the tanks in the AH-64D would result in the behavior that you see in game. This would also be how it would manifest if refueling personnel were told to "stop short" from filling up an aircraft to a maximum amount.

The AH-64D wasn't originally designed for an internal aux tank. This was a later product offered to fit in existing aircraft with minimal modifications. As such, the options for managing how the fuel was loaded and offloaded were limited.

  • Thanks 1

Afterburners are for wussies...hang around the battlefield and dodge tracers like a man.
DCS Rotor-Head

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