mechanical device
airplane propeller
airscrew
prop
screw
screw propeller
variable-pitch propeller
anti-gravity
axial-flow
band saw
blood-slick
frictionless
heron-mark
high-efficiency
hydro-electric
infrasonic
ingentis
jet-engine
leaf-shaped
onshore
piggin
science-fictional
steam-powered
thathad
turboshaft
twenty-inch
two-stage