Alex, You have explained it fantastically. I have always said when you move
flaps you in effect put a totally new wing on the aircraft. We have proven
this over the years experimenting with the RiteAngle AOA systems. If that
wasn't true we sure would have not put all the $ into R&D, programming, and
parts
for correcting up to 6 different flap positions on our RiteAngle AOA systems!
There isn't much different on some airfoils, huge differences on others. Our
vane measures the relative wind~ what the wing sees proves this fact.
Questions ~ reply off line.
Elbie Mendenhall, EM Aviation
Extending your flaps with fixed leading edges increases lift coefficient
but the angle of incidence becomes smaller, draw a line from l/e to t/e
to see the chord at any given point and configuration and then hold it
against the relative airflow to see incidence.
Extending leading edge devices such as slats or l/e flaps increases the
angle of incidence again given a steady pitch angle.
So thats what you get, a dramatic change one or the other way in pitch
required to stall at a given speed when extending one or the other.
Alex
|