A flat flap is added to the flat plate airfoil as shown belo

A flat flap is added to the flat plate airfoil as shown below. Calculate the change in lift and drag coefficients between thing at Mach 2 and Mach 3 if the airfoil is flying at an angle of attack of 8 deg and the flap is deflected by 4 deg.

Solution

The answer of following question is as follows.

The change in lift coefficient is 7 while the change in drag coefficient is 4