Question

• How does lift change with altitude if a constant AOA and airspeed are held? (provide specific examples)
• How does lift change with airspeed if a constant AOA and altitude are held? (provide specific examples)

Answer 1

1) A change in altitude means a change in theta. Using the lift equation, we can see that this can have a considerable effect on lift while angle of attack and airspeed is constant.

Example - suppose an aircraft is flying at 10000 ft, then theta will be different for which lift will be different. Now, if we decrease the altitude, theta will also change, which in result will change the lift.

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2) This is simple. we know that faster the plane is moving, the faster the air over the top of the wing.This can generate more lift.

Example -  An aircraft flying at 200 knots at an altitude of 10,000 ft and an AOA of 15 degrees. This means theta is .7385 and CL is 1.345 Wings area = 200 (Note you can take any value - the thing is that you were supposed to provide this value - but rather you posted only questions with incomplete information)