I found this bug while testing some plane's endurances for air racing. I set up a mission on FMB using the Crimea map and the airfield next to Sevastopol. After testing some short range fighters (like Me 163
) I switched to G4M1-11, and instead of 25% fuel picked only 2%.
Method is simple, take off with full power, start timer, fuel out, stop timer. Then I imported the data to Calc sheet, and got the following figures:
Fuel loadout: 2%
Endurance: 2 min 8 s
Calculated 100% fuel endurance: 1 hour 47 minutes
Which is WAY too low. Yes, I know that you don't get maximum range with full power, but let me explain. The plane's total horsepower is 3060 (2x1530), and if we assume that the specific fuel consumption of the engine is ~0,25 kg/hp/h, the total consumption is 765 kg/h. Now, according to
this source, G4M1-11 had 4900 liter fuel capacity. This means ~3500 kg of fuel, and the with that amount the corresponding endurance is 4 hours 36 minutes. Of course, to get the 6000 km range, you would need to lower the engine settings, and cruise for almost 20 hours!
Now the Betty's range is only ~1/3 of its real range, which means that either the fuel capacity or consumption rate is modelled wrong. If it's too late for 4.10, I'd like to see this fixed in 4.11. I can do some more tests with other planes to see if they're ok.