Plain English Meaning

To push something forward. In an aircraft, the engine system pushes the airplane through the air so it can fly.

Full Definition

To drive or push an object forward by applying mechanical force. In aviation, the engine and propeller (or jet exhaust) work together to propel the aircraft through the air by producing thrust.

Context Anchor

Seen in powerplant discussions when describing what the engine and propeller do for the aircraft.

Derivation

From the Latin propellere, meaning 'to drive forward' (pro = forward, pellere = to push). The same root gives us 'propeller' — literally the device that pushes the aircraft forward.

Why Pilots Care

A pilot needs to understand what propels the airplane because reduced means reduced forward force, which directly affects , , and continued .