Definition
An airplane powered by one or more turbine engines that drive propellers through a reduction gearbox. The turbine produces shaft power, which turns the propeller; the propeller, not jet thrust, provides nearly all of the airplane's forward thrust.
Plain English
An airplane with engines that work like a small jet inside, but instead of pushing the airplane with jet exhaust, the engine spins a propeller that pulls the airplane through the air.
Context Anchor
Seen when comparing airplane types and when transitioning to higher-performance single-engine or multiengine airplanes.
Derivation
Built from 'turbo' (short for turbine, from Latin 'turbo' meaning a spinning thing or whirlwind) and 'propeller' (from Latin 'propellere', to drive forward). Together it names exactly what the engine does: a turbine drives a propeller.
Why Pilots Care
Turboprop airplanes deliver strong low-speed performance and fuel efficiency that affect takeoff, climb, and engine-out procedures during multiengine training.
Intuition Check
Do not assume “turbopropeller-powered” means the airplane is powered mainly like a jet. The engine is turbine-based, but the propeller does most of the work of moving the airplane.
Example Sentence 1
The pilot transitioned from a piston twin to a turbopropeller-powered airplane and had to learn new starting and power-management procedures.
Example Sentence 2
Transition students practiced propeller feathering on the turbopropeller-powered airplane before moving to jet aircraft.