71940 ⎘
Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft Spiral-shaped propellers
PROPELLER
#2PROPELLER
#3Propeller
#4Propeller
#5PROPELLER STRUCTURE IN THE FORM OF TWIN MOBIUS BLADES FOR AIRCRAFT
#6Propeller
#7Propeller
#8Rotating fluid conduit utilized such a propeller or turbine, characterized by a rotating annulus, formed by a rotating inner hub and a rotating outer shell
#9Round Honeycomb Rotor