The Variable Pitch Propeller is a technology that enables the engine to change its thrust magnitude and direction without changing the speed or direction of its rotation.
This is achieved by pitch variation of the propellers ( changing the angel of attack )
In large aircrafts, VPP Variable Pitch Propeller is used to change the value or direction of thrust.
The C-130 is a good example. It can go backwards on the ground by reversible-pitch propellers without changing the the propeller rotation direction.
This maneuvers can be done in model aircrafts due to the high speed of motors compared to the light wight of aircraft body which is made of balsa wood or foam.
One of a C-130J Super Hercules' 6 bladed Dowty Rotol R391 composite controllable- and reversible-pitch propellers.
In R/C airplanes, this concept can be used in air. The airplane models can fly forward or backwards or in any other direction.
You can watch the videos.
This is achieved by using this motor which varies the blades angle of attack.
Sources:
https://en.wikipedia.org/wiki/Variable-pitch_propeller
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