Area Under A Curve
will vary. Actual answers will depend upon the altitudes chosen by the
students. With all students' answers, a trend should emerge.
should note that the basic shape seems to be retained in the Airfoil Plotter
View Panel. However, the pressure values shown along the y-axis change
as the altitude is altered. Therefore, if the five views are sketched
on the same piece of graph paper, each basic shape should become "thinner."
The resulting area of the basic shape should decrease as the altitude
is increased, i.e., the pressure decreases as the altitude increases.
As the altitude increases, the density of the air decreases and the lift
on the airfoil decreases. This explains why an aircraft has a flight "ceiling",
a maximum altitude at which it can fly. Above the ceiling, the lift is too small
to overcome the weight.