Discussion
A tailplane of area \( 28 \) m\(^2\) operates at a dynamic pressure of \( 12 \) kPa with a lift coefficient of \( -0.15 \). The tail load is
Answer: B
Correct answer: 50.4 kN downward
The load follows from dynamic pressure, area and lift coefficient:
\[ L = q\,S\,C_L = 12 \times 28 \times (-0.15) = -50.4\ \mathrm{kN} \]
The negative sign means the force acts downward, which is the usual sense for a conventional tail in trim. Keeping the units straight settles the magnitude: kilopascals times square metres gives kilonewtons directly, so no conversion is needed and the 504 kN distractor is a factor-of-ten slip.
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