Thank you

Regarding the issue of automatic rolling of airplanes, simply remove one wing and copy the other. Your airplane's horizontal tail is too small, making it a bit difficult to operate

Open the menu, find the buttons for the icons of the three balls, press them, and you will see three balls on your airplane. The red ball represents the center of gravity, the blue ball represents the point of lift action, and the yellow ball represents the point of power action. Your airplane's red ball is too close to the blue ball and is prone to backflip during flight. Add some weight to the nose appropriately. Your air intake is too large, and excessive wind resistance can also affect the stability of your aircraft. Try to retract the air intake to maintain a more streamlined shape. The engine horsepower is not enough. You can replace it with a larger engine or use the XML manager to adjust the thrust, or reduce the weight of the tail appropriately