What makes up an RC?

Airplane

Power

Propellers
Amongst RC airplanes, prop power is the most common. A propeller can be driven by an electric motor or a nitro engine. Among electrics, some are direct-drive (prop on the output shaft of the motor) and some use gear reduction through a small transmission that is frequently of the same diameter as the motor. Multiple propeller/powerplant units can be used on a single plane for more thrust or to imitate full-scale multi-engine craft. Props can be mounted above a wing, underneath, between two wings on a biplane, or in the nose or tail of the fuselage. When a propeller faces to the rear, the configuration is called a "pusher" since the plane is essentially pushed forward.

Electric Ducted Fan (EDF)
A number of RC planes mimic the appearance and flight characteristics of full-scale jets with the use of ducted fans. A ducted fan is essentially a motor and specially-designed propeller (called an impeller) mounted in a hollow cylinder.

Jets
Believe it or not, there are real jet turbine engines available in small scale for use on large RC airplanes. These are very expensive, but work exactly like their full-sized counterparts, compressing air and injecting fuel to create a stream of very hot and fast-moving exhaust.