Questions regarding the fuel and load

  • 77W heavy, high speed approved.

    Will masses be directly configurable through the MCDU/FMS as well as the external menus? It would make preflight planning far easier if it can be directly implemented into the INIT pages. Would it be possible to bring back the Apple keyboard on iPads as an option in the nav menu? It makes entering many waypoints far easier.

    -Kind regards and bons vols!

  • Will this update also include an adjustment to the center of gravity?

    Due to payload and fuel distribution the center of gravity will shift but for now the system tries to balance the weights in such a way that the CG remains close to a fixed target. Of course this isn't always possible and an empty aircraft, an aircraft with full fuel tanks but no payload or an aircraft with full payload and barely any fuel will have different CGs.

    So we actually have to load the fuel and payload correctly, so that the CG stays within limits.

    For the A380 this is quite complicated, there is a particular refueling distribution that is used in the real world and soon in Aerofly FS, which looks like this (from the A380 FCOM):

  • Due to payload and fuel distribution the center of gravity will shift but for now the system tries to balance the weights in such a way that the CG remains close to a fixed target. Of course this isn't always possible and an empty aircraft, an aircraft with full fuel tanks but no payload or an aircraft with full payload and barely any fuel will have different CGs.

    So, will we consume fuel as we fly? Because as we approach landing, we will either descend at high speed or be unable to reach certain altitudes.

  • Due to payload and fuel distribution the center of gravity will shift but for now the system tries to balance the weights in such a way that the CG remains close to a fixed target. Of course this isn't always possible and an empty aircraft, an aircraft with full fuel tanks but no payload or an aircraft with full payload and barely any fuel will have different CGs.

    So we actually have to load the fuel and payload correctly, so that the CG stays within limits.

    For the A380 this is quite complicated, there is a particular refueling distribution that is used in the real world and soon in Aerofly FS, which looks like this (from the A380 FCOM):

    Wow, what a highly detailed and incredible explanation. Thank you so much for the clarifications. I understood the center of gravity issue very well. You even created a topic for me. Thank you again for your kindness. I have another question. Was fuel consumption implemented in all aircraft? I remember that previously the only aircraft that simulated fuel consumption was the Learjet, but this was deactivated by the development team due to a bug that caused the fuel to be consumed rapidly after about 40 to 60 minutes of flight. I also remember that the amount of fuel in the Learjet was standard and insufficient for certain routes. But after this fuel consumption was deactivated, making it infinite, it temporarily solved this problem in the Learjet, making it possible to fly long routes without worrying about running out of fuel.

  • Due to payload and fuel distribution the center of gravity will shift but for now the system tries to balance the weights in such a way that the CG remains close to a fixed target. Of course this isn't always possible and an empty aircraft, an aircraft with full fuel tanks but no payload or an aircraft with full payload and barely any fuel will have different CGs.

    So we actually have to load the fuel and payload correctly, so that the CG stays within limits.

    For the A380 this is quite complicated, there is a particular refueling distribution that is used in the real world and soon in Aerofly FS, which looks like this (from the A380 FCOM):

    Another question: Therefore, the adjustment of the center of gravity will be automatic according to the weight (load) and the amount of fuel carried on board the aircraft? I imagined that this center of gravity adjustment could be done manually by the user, as is the case in other simulators, but it seems that in Aerofly FS it works differently.

  • Will masses be directly configurable through the MCDU/FMS as well as the external menus? It would make preflight planning far easier if it can be directly implemented into the INIT pages. Would it be possible to bring back the Apple keyboard on iPads as an option in the nav menu? It makes entering many waypoints far easier.

    Our aircraft behave like in the real world, so changing a number in the FMS will not magically make the aircraft heavier. You can go to the main menu and them to the new fuel and load menu and change the weight pretty much instantly at any time. In the simulation you can then insert the correct values for zero fuel weight for example by double clicking the line select key or text box. With the new assistance feature this is done automatically, if enabled.

  • Another question: Therefore, the adjustment of the center of gravity will be automatic according to the weight (load) and the amount of fuel carried on board the aircraft? I imagined that this center of gravity adjustment could be done manually by the user, as is the case in other simulators, but it seems that in Aerofly FS it works differently.

    For now the balancing is taken care of for the most part, you just have to set the correct takeoff trim (unless the assistant for auto trim is active).

    We've considered adding a weight and balance menu but that would have delayed the update quite substantially because we would have to add all kinds of custom graphical menu elements to display the movement of the CG, allowed ranges for different phases of flight, fuel CG shift as the tanks are drained. Multiply this work by the number of aircraft in the sim and it suddenly it takes a while to research all that info and to set it up for each plane. And you can't even find some of these online easily or at all.

  • Wow, what a highly detailed and incredible explanation. Thank you so much for the clarifications. I understood the center of gravity issue very well. You even created a topic for me. Thank you again for your kindness. I have another question. Was fuel consumption implemented in all aircraft? I remember that previously the only aircraft that simulated fuel consumption was the Learjet, but this was deactivated by the development team due to a bug that caused the fuel to be consumed rapidly after about 40 to 60 minutes of flight. I also remember that the amount of fuel in the Learjet was standard and insufficient for certain routes. But after this fuel consumption was deactivated, making it infinite, it temporarily solved this problem in the Learjet, making it possible to fly long routes without worrying about running out of fuel.

    Thanks. Like I wrote in the main thread fuel consumption is currently only available for the C172 for testing. Fuel systems have been added to some aircraft but at of right now they remain disabled for the release. There are already enough things that we need to test first.

    If you're interest, look at how the real A380 fuel systems works. We would have to simulate all that and that's just one aircraft. Concorde would be another difficult one and would require a simulated flight engineer. In other words just those two aircraft will keep me busy for weeks.

  • Our aircraft behave like in the real world, so changing a number in the FMS will not magically make the aircraft heavier. You can go to the main menu and them to the new fuel and load menu and change the weight pretty much instantly at any time. In the simulation you can then insert the correct values for zero fuel weight for example by double clicking the line select key or text box. With the new assistance feature this is done automatically, if enabled.

    So without auto-cockpit the cheat values will add correct (ones I configured) weights in automatically? And will N1 on takeoff change with weight (i.e. high N1 737NG takeoffs)

    -Kind regards and bons vols!

  • Thanks. Like I wrote in the main thread fuel consumption is currently only available for the C172 for testing. Fuel systems have been added to some aircraft but at of right now they remain disabled for the release. There are already enough things that we need to test first.

    If you're interest, look at how the real A380 fuel systems works. We would have to simulate all that and that's just one aircraft. Concorde would be another difficult one and would require a simulated flight engineer. In other words just those two aircraft will keep me busy for weeks.

    So this means that fuel consumption in all airplanes remains as it is, that is, infinite and will never end?

  • Thanks. Like I wrote in the main thread fuel consumption is currently only available for the C172 for testing. Fuel systems have been added to some aircraft but at of right now they remain disabled for the release. There are already enough things that we need to test first.

    If you're interest, look at how the real A380 fuel systems works. We would have to simulate all that and that's just one aircraft. Concorde would be another difficult one and would require a simulated flight engineer. In other words just those two aircraft will keep me busy for weeks.

    I already had some idea that adding fuel consumption to aircraft is extremely complex and laborious. But now, with your detailed explanation of each aircraft's fuel systems and working on each one separately, I've been able to further reinforce my understanding of the enormous difficulties the development team faces in bringing this functionality to the simulator. Despite it being very difficult and laborious, I still hold out hope that the IPACS team will bring this fuel consumption feature to Aerofly FS in the near future.

  • Maybe I can give a little clarification on the fuel system.

    In the C130 we have programmed a working fuel system. This is based on the previous structure of the fuel system. However, the C172, which Jan referred to, has a different structure in the fuel system. The new structure has the advantage that it is more universal.

    The disadvantage is that the conversion is more or less complex depending on the aircraft and many things must be done carefully by hand. Therefore, it will take time to convert the individual aircrafts.

    Tschüss, Michael (🍎🚁)

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  • Our aircraft behave like in the real world, so changing a number in the FMS will not magically make the aircraft heavier. You can go to the main menu and them to the new fuel and load menu and change the weight pretty much instantly at any time. In the simulation you can then insert the correct values for zero fuel weight for example by double clicking the line select key or text box. With the new assistance feature this is done automatically, if enabled.

    But for example. If you have a full plane it won’t take off with a big derated take off option. Maybe you will need a TOGA take off. That will be simulated in the update?