Su-25T MP External Tank Fuel Quantity Bug

[Ironhand]

This is only an issue when using the MP Re-arming/Refueling Screen. It was first noted by mastershotgun in this thread: Su-25T fuel tanks. When adding or removing external tanks with a 100% internal fuel load, there are no issues. Adding or subtracting the tanks adds or removes 620 kg of fuel, though the cockpit reading is always 15 kg less for some reason.

 

The problems start, however, when adding external fuel tanks with less than 100% internal fuel. To simplify the illustration, I've added and removed the same single tank to station 7 multiple times on the Su-25T:

 

 

If you follow the chart, you'll see that, although the refueling screen indicates that you adding a total of 740 kg (620 kg of fuel plus the 140 kg tank) to the aircraft with the initial tank (B5, C5), a total of 975 kg (E5) is actually added. That is problem #1.

 

Problem #2 is that, until 100% internal fuel is obtained, a portion of each tank's fuel remains onboard as internal fuel, if the tank is removed. The loading screen, however, indicates that you are removing all of the fuel as well as the tank's weight (620 kg of fuel plus the 140 kg tank) when, in actuality, you are only removing 20 kg of fuel that first time. And on it goes. By adding and removing the same tank, you will eventually end up with a full internal fuel load and the additional tank's worth of fuel (minus the 15 kg that is aways missing for some reason).