передавальні числа переднього ходу в коробці передач
reduction ratio / gear ratio
Voltage Standing Wave Ratio (VSWR) / voltage standing-wave ratio
forward observer (FO), forward observation officer; (artillery) observer / spotter
forward gear
forward epicyclic gear trains
forward retracting landing gear
camshaft gear (timing gear)
gear reduction unit / gear-reduction unit
aspect ratio
fighter-to-administrative personnel ratio
high expansion-ratio
mass ratio
power-to-weight ratio
signal-to-noise ratio (SNR; S/N)
thrust-to-weight ratio
damping ratio
attenuation ratio
base pressure ratio
weight-horsepower ratio
weight-strength ratio
depression ratio
explosion ratio
infantry-armor ratio
fuel-air ratio
fuselage fineness ratio
compression ratio
engine pressure ratio (EPR)
excess air ratio
fuel hydrogen / carbon ratio
hub-tip ratio
mixture ratio
pressure ratio