Discussion
By linearised supersonic theory, a flat wing at \( 4 \) degrees incidence at \( M = 2 \) has a lift coefficient nearest to
Answer: C
The result is \( c_l = 4\alpha/\sqrt{M^2-1} \), with \( \alpha = 0.0698 \) radians and \( \sqrt{3} = 1.732 \), giving \( 4 \times 0.0698/1.732 = 0.161 \). The subsonic two pi alpha value of 0.439 does not apply above Mach one and is offered as the trap.
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