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.
Plain English
To push something forward. In an aircraft, the engine system pushes the airplane through the air so it can fly.
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 engine power means reduced forward force, which directly affects takeoff, climb, and continued flight.
Intuition Check
Propel does not mean hold the airplane up. It means move it forward; the wings can then produce lift as air flows over them.
Example Sentence 1
The piston engine turns the propeller, which propels the aircraft forward through the air.
Example Sentence 2
A more powerful engine helps propel the aircraft during a climb.