Speeds where only some parts of the air around an object -LRB- such as the ends of rotor blades -RRB- reach supersonic speeds are labeled transonic -LRB- typically somewhere between Mach 0.8 and Mach 1.2 -RRB-.
Speeds where only some parts of the air around an object -LRB- such as the ends of rotor blades -RRB- reach supersonic speeds are called transonic -LRB- typically somewhere between Mach 0.8 and Mach 1.2 -RRB-.