critical speed of flow
критична швидкість течії
критична швидкість течії
critical value of Reynolds number in pipe flow
supersonic speed (exceeds speed of sound / Mach 1)
variable-speed with speed control
instantaneous vertical speed indicator / instantaneous vertical-speed indicator (IVSI)
Nr gauge (Nr = speed of rotation) / rotor speed sensor
commander’s critical information requirements (CCIR)