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Lift and Drag
kelvin2150
Topic Author
kelvin2150 created the topic: Lift and Drag
When an aircraft is mainitaining level flight at the stalling speed,any increase to angle of attack will lead to
A) Lift increase and Drag decrease
B)Lift Decrease and Drag Increase
C)Life Increase and Drag increase
D)Lift Decrease and Drag Decrease
E)No lift gererated due to stall and Drag increase
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Hi Richard,
Thanks for your quick response.
I also got the answer B.
From my understanding, i believe the wings still generate lift AFTER critical angle of attack but considerably its not as
much as before. Therefore the lift is reducing after the wings stall.
For the drag, since the wings are stalled already, drag will significantly increase.
The aircraft is flying straight and level at the stalling speed. Another way of thinking about the stalling speed is to realise the stalling speed is the speed where you must fly with the wing at the critical angle of attack to produce the lift required to maintain level flight at the slow speed. Any increase in angle of attack will therefore exceed the critical angle and the amount of lift generated will decrease. You are correct, the wing still produces lift, just less than it did before.
As for the drag, when you increase the angle of attack of the wing, you are presenting a greater surface to the relative airflow which will result in an increase in drag. The turblence and backflow of air after the stall will also create drag as well as ruin the lift.
