This video is about an experimental RC scratchbuild featuring a wing with slots in it. Hope you're wondering why wings stall!
Boundary Layer Clarification: it is said that the air CLOSEST (like super duper close) to the wing has a velocity of 0. But I made it seem like all of the air in the boundary layer doesn't move which is NOT TRUE. The boundary layer is is a layer of air thats getting slowed down by friction and it's thickness is from the very surface of the wing to the point where the air is all moving the normal speed and not getting slowed down.
All fluids have some viscosity and so boundary layers form when any fluid (like water air oil or honey) rub up against something else.
Pilots are taught that a wing will always stall at a certain angle relative to the wind (or Angle of Attack) That is the extent to which pilots are taught why a wing stalls, it's the critical angle of attack. This angle corresponds to the slowest speed that an airplane can fly and still produce lift equal to its weight. If the plane goes any slower, than the angle required exceeds the stalling angle.
But the plane can also stall at a much higher speed if it pulls up too aggressively. A plane can stall at a very high airspeed in a turn, and pulling out of a dive etc.
The REASON that the wing stalls at a certain angle is kind of what I explained in this video. The Low to High pressure gets more extreme at higher angles. As the speed (or kinetic energy) of the air increases, so does the pressures. But the RATIO of speed to pressures is what changes with the angle.
So you know more than Pilots :)
The stalling angle can change if the shape of the wing changes.
Video's featured/used in this video:
Stairway to Heaven plane: • SLAT PLANE (STAIRWAY T...
Boundary Layer: www.youtube.com/watch?v=7SkWx...
Wind tunnel footage: • Video
Tell Tail on stalling wing footage: • Vortex Generators on E...