Definition
Describes an aircraft driven by a turbopropeller engine, in which a gas turbine produces shaft power that turns a propeller through a reduction gearbox. The propeller produces nearly all of the thrust, while the turbine's exhaust contributes only a small amount.
Plain English
Powered by an engine that uses a jet-style turbine to spin a propeller. The propeller does the work of pulling the airplane through the air; the turbine just provides the spinning power.
Context Anchor
Seen when comparing airplane types, especially in discussions of operating larger, faster, or more advanced propeller airplanes.
Derivation
Built from 'turbo-' (from Latin 'turbo', meaning a spinning or whirling thing — the same root as turbine) and 'propeller' (from Latin 'propellere', to drive forward). So a turbopropeller is literally a turbine driving a forward-pulling propeller. 'Powered' simply indicates the airplane uses this type of engine.
Why Pilots Care
Affects climb performance, fuel efficiency, and handling procedures specific to this engine type.
Intuition Check
Do not read turbopropeller-powered as meaning the airplane is simply a jet. The turbine engine is there mainly to spin the propeller.
Example Sentence 1
The pilot's first turbopropeller-powered airplane required new training on torque management and propeller feathering.
Example Sentence 2
Pilots transitioning to turbopropeller-powered aircraft must learn the specific propeller and power-lever procedures.