According to Bernoulli's principle and for a given angle of attack would that not lower the lift force of the airplane and increase its drag and therefore increasing its demand in thrust and fuel consumption?
This is anti-economic and puts the airplane under unnecessary mechanical stress.
I am not referring to the angle of attack adjusted by the pilot during flight or to any preinstalled by the manufacturer angle of incidence on the wings to support lift but solely to the shape of the wings. For example aerobatic airplanes (i.e. stunt planes) and most modern fighter jets, they don't rely at all on wing shape for lift. Their wings are evenly shaped flat upside and downside (i.e. instead of being usually in other airplanes, curved upside and flat downside).
Therefore, their flat evenly shaped wings do not support additionally to the angle of attack and incidence angle the lift of the plane.
Why not this additional feature of upside curved wing shape is not present in this kind of airplanes? Is there any particular reason(s)?
What is the trade-off here? A curved wing creates lower resistance on the upside and therefore faster air speed and lower air pressure (Bernoulli's principle) upside. Thus, increases lift in addition to the main lift generated by the angle of attack and incidence angle.
It would be logical to make use of this feature in fighter jets and aerobatic airplanes to generate larger lift with less thrust and less fuel consumption.
Best Answer
The "equal-time fallacy" is alive and kicking, as shown in your question and the other answers. Look, here is the best explanation I've seen about how wings work and airplanes fly: https://www.av8n.com/how/
The "equal-time fallacy" says when two molecules of air get separated at the leading edge of a wing, they must come together at the trailing edge. So in order to get faster flow over the top (for lift), there must be a longer curve over the top. WRONG. The molecules do NOT meet up. The upper one gets there first. The result is a vortex in which air is pushed DOWN, and that makes the lift.
Wings lift because they push the air down, not because they are shaped a particular way, but because they fly at an angle-of-attack (AOA). The shape is just an optimization for typical flight. Wings on aerobatic airplanes are symmetrical because they typically fly inverted just as well as upright.
Is Bernoulli wrong? No. Bernoulli is absolutely true. What is wrong is the typical explanation, which is still being taught to kids. Again, read https://www.av8n.com/how/