An aircraft increases its speed by 2% in straight and level flight. if the total lift remains constant determine the revised cl as a percentage of its original value to three significant figure

96.1%

Explanation:

We know that lift force

                                                                    ------------(1)

Where is the lift force coefficient .

          ρ is the density of fluid.

         A is the area.

        V is the velocity.

Now when speed is increased by 2 % and all other parameter remains constant except .

Let;s take new value of lift force coefficient is .

                                                                         -----------(2)

Now from equation 1 and 2

⇒

So we can say that revised value of  lift force coefficient is 96.1% of original value.

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