відношення діаметрів втулки і кінців лопаток, втулкове відношення
blade tip light / main-rotor blade tip light
main-rotor blade tip light blade tip light
tip speed ratio
reduction ratio / gear ratio
Voltage Standing Wave Ratio (VSWR) / voltage standing-wave ratio
jam to signal ratio (J/S ratio)
hub and spokes system
hub assembly
portal hub
clutch disk hub
idler wheel hub cap
worm-wheel hub
direct and overdrive clutch hub
fan hub clutch
hub brake
hub disk
hub guard
hub stud
anti-torque rotor hub
main rotor hub
split wheel hub
wheel hub
wheel hub integral flange
main-rotor head / main-rotor hub
main-rotor hub / main-rotor head
rotor hub
tail rotor hub
key rail hub
reinforced hub
hub
hub (drone)
pointed tip