Auto-gyros. (I edited the Question to as "What are" these.)
An autogiro is an aircraft in which lift is provided by unpowered rotating wings and thrust is provided by a conventional propeller.
A helicopter is an aircraft that is lifted and propelled by one or more horizontal rotors, each rotor consisting of two or more rotor blades. Helicopters are classified as rotorcraft or rotary-wing aircraft to distinguish them from fixed-wing aircraft because the helicopter achieves lift with the rotor blades which rotate around a mast. A helicopter takes off vertically by using a set of blades shaped like aerofoils to generate lift by rotating the blades at high speed and as such does not require runways
a propeller
a engine
a Propeller
It is the propeller.
propeller
propeller.
Pitch is a rotating movement of the body of the aircraft about the axis of the wings. Pitch is represented by rotating to tilt the aircraft up or down. Yaw is a rotation left and right, similar to turning your head to the left and right. Roll is a rotation of the aircraft about the front to rear axis. An aircraft would roll if the pilot wanted to turn it to fly upside down.
To display a label in a direction other than horizontal.
Most aircraft maintenance people work rotating shifts.
To counteract the the right hand tourque produced by the clockwise rotating engine