The diameters of the main rotor and tail rotor of a single-engine helicopter are 14.4 m and 2.1 m, respectively. The respective rotational speeds are 420 rev/min and 4110 rev/min.
What is the speed of the tip of the large rotor? Give answer as a fraction of the speed of sound, vsound=343 m/s.
What is the speed of the tip of the small rotor? Give answer as a fraction of the speed of sound, vsound=343 m/s.