In 1855, the first iron propeller driven ships were ordered from England.

This motor drives the motion of the filament, which acts as a propeller.

Problems with propeller fouling, blocked intake pipes and damaged drive shafts have been reported.

And despite the aerodynamic interactions of these propeller blades, they're able to maintain stable flight.

The Propeller Banksia ( Banksia candolleana ) is a species of shrub in the plant genus Banksia .

A propeller is a type of fan that transmits power by converting rotational motion into thrust.

Initially, many different designs were considered, including an unconventional project with two main rotors, placed with engines on tips of wings (in perpendicular layout), and with an additional pusher propeller on the tail.

People have been struggling for years to try and design a very fast rotating boat propeller that doesn't cavitate and literally wear away the metal and put holes in it, just like these pictures show.