Discussion
A light aeroplane cruises at \( 50 \ \mathrm{m/s} \). Its phugoid period is roughly
Answer: D
Using the shortcut \( T \approx 0.45\,u_0 \), the period is \( 0.45 \times 50 = 22.5 \ \mathrm{s} \), so a little over twenty seconds: brisk enough for a pilot to notice the aeroplane hunting in speed within a few seconds of releasing the stick. 45 s and 90 s belong to aeroplanes trimmed at 100 and 200 metres per second, so they show how much faster a light aeroplane's phugoid is than a jet's. 11 s halves the correct answer. The comparison is the practical reason phugoid handling complaints are more common on fast aeroplanes.
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