Discussion
At a true airspeed of 180 knots, the bank angle for a standard rate turn using the approximation \( \mathrm{bank} \approx \mathrm{TAS}/10 + 7 \) is about
Answer: C
Correct answer: 25 degrees
Apply the rule of thumb directly:
\[ \frac{180}{10} + 7 = 18 + 7 = 25^\circ \]
The approximation works because the bank needed for a given rate of turn rises with speed, and the linear form fits well over the range of light aircraft speeds. It shows why a standard rate turn becomes impractical at high speed: at 400 knots the formula gives 47 degrees, which is why airliners use half standard rate above about 250 knots.
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