Outerra Tech Demo download. Help with graphics driver issues
You need to "trim" the airplane. There are various dynamic forces affecting the aircraft, and if you want to have it leveled so that the axis can stay at 0, you need to apply trim on the axes. The trim buttons are configurable in the input config menu.Later there will be also a simplified mode, turning off some simulated forces, seehttp://www.outerra.com/forum/index.php?topic=1009.msg11800#msg11800
Are you using the development version? There are multiple trim controls for each axis.
Please download the dev version here: http://www.outerra.com/forum/index.php?topic=1146.0It has lots of improvements (importer too); we will be merging it into the main version soon.