Any heavy is different than a non heavy as to how it flys. They all will have a nose up attitude even when in straight and level flight. I call it the sit down and take it easy approach. I do not want to tell you not to pay attention to the degree that it does go nose up as to much can lead to a stall. I would use the shift Z key to dispaly altitude and air speed at the top. Then start slowing down while trying not to loose altitude at some point in time it will stall this will give you a idea as to what to expect during a stall and the spead it stalled at. Of course weights will make a differance as well and will change the stall speed. A rule of thumb is as weights increase stall spead will increase as well. Another words the heavier you get the faster you have to go to prevent a stall.
Most manuals will give you stall speads, but the problem is that not all manuals will give you all of the stall speads, and ther are a lot of different situations to consider.
I would suggest you grab your favorite 747 load it to what you expect most of your flights to be, then take it for a trip. Plan a flight with a lot of turns in it so you see how it handles, remember to set your fuel levels to allow you enough fuel to make the flight and a little in reserve for taxing. This is about the only way you can learn how to fly these planes try not to use autopilot that much so you can get the feel and learn how to trim the craft as it goes along
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