The first is that a stall is related to engine failure. An aerodynamic stall has nothing to do with engine power, and the plane will not fall out of the sky if the engine quits.
Another misconception, as often seen in movies, is that the plane will go into a dive and become uncontrollable without any chance of recovering.
Sine the dawn of aviation pilots have been stalling there aircraft intentionally.
It is therefore important to understand stalling and what happens to the remote controlled airplanes once they enter a stall in order to avoid the dreaded stall accident.
Let me start by briefly explaining angle of attack.
Only one thing causes a stall, exceeding the wing's critical angle of attack.
The angle of attack [AoA] is the angle formed by a line drawn between the wing's leading and trailing edges [chord line] and the relative wind.
The term" relative wind" donates the direction of the air stream relative to the airplane.
For instance, during foreword horizontal flight, the relative wind is horizontal and rearward. The direction of the relative wind of an airplane in a vertical dive is upward and vertical.
The amount of lift generated by a wing is dependent on the AoA.
As the AoA is increased the wing provides more and more lift.
As you increase the AoA, a point will be reached where the airflow can no longer conform to the airfoil's surface.
The airflow becomes turbulent and does not produce any lift, and drag increase greatly. This point is called "critical angel of attack" and is typically between 12 and 15 degrees for most remote controlled airplanes.
Without lift, the remote control airplane is no longer flying and is at the mercy of gratify.
So to summarise, when we say a wing is "stalling" we mean that is has exceeded the critical angel of attack and not an engine failure. So whether you fly remote controlled airplanes or big planes be sure to keep stalling clear in you mind at all times.
No comments:
Post a Comment