useful power of propeller

Useful when Dynamic Power is enabled for supporting radios

negative thrust propeller / negative-thrust propeller

useful efficiency

useful horsepower

useful output

useful idiots (European politicians failing to confront Russia)

Enable beeping - useful for locating a crashed aircraft

input power of propeller

net thrust power of a propeller

propulsive horse-power of propeller

thrust horse-power of a propeller

torque horse-power of propeller

high-power illuminator radar / high power illuminating radar (HIPIR)

drive line / drive (propeller) shaft

propeller aeroplane

propeller shaft (drive shaft)

propeller-driven

turboprop propeller

propeller blade

front axle propeller shaft

front rear axle propeller shaft

flanking propeller

ball head of propeller tube

water propeller

water propeller shaft

water propeller transfer case

non-uniform pitch propeller

end yoke type propeller shaft

fan drive propeller shaft

jackshaft propeller shaft

propeller gearbox

adjustable propeller