Propellor

The funky looking Osprey is a tiltrotor military aircraft which has the functionality of both a conventional helicopter and a propellor-powered plane, making it adaptable to a wide variety of combat scenarios.

The microboat doesn't have a propellor and is based on a standard boat design used for testing 3D printers - they were testing a new microscale 3D printer.

And I would guess that little tiny propellor hat on the top is some kind of radar or communication array.

They have been operating propellor aircraft and just took the delivery of one Embraer 145 jet.

A similar design, called the autogyro boat, uses a wind turbine without the propellor, and functions in a manner similar to a normal sail.

Iran even was producing UAV's and the Pilatus PC-7 propellor aircraft for observation.

The Bristol Aeroplane Company proposed to combine jet and piston engines but dropped the idea and concentrated on propellor turbines instead.