Definition
Helicopters powered by a gas turbine engine (turboshaft) rather than a piston engine. The turbine drives the main and tail rotors through a gearbox and produces shaft power by burning fuel in a continuous combustion process, delivering high power-to-weight performance and smoother operation than piston equivalents.
Plain English
Helicopters that use a jet-style engine to spin the rotors, instead of a piston engine like the kind found in a car or small airplane.
Context Anchor
Seen in helicopter instrument flying when discussing power control, engine indications, and straight-and-level flight.
Derivation
From Latin turbo meaning 'whirlwind' or 'spinning thing.' A turbine engine works by spinning a wheel of blades using hot expanding gas. Calling these helicopters 'turbine-powered' simply identifies the type of engine spinning the rotor system.
Why Pilots Care
Different power-response timing and torque limits affect how collective and throttle are used to hold altitude and airspeed in instrument conditions.
Grounding Statement
In a turbine-powered helicopter, the turbine engine is mainly there to turn the rotors, not to push the aircraft forward like a jet airplane.
Intuition Check
Do not assume turbine-powered means the helicopter is pushed forward by jet exhaust. In this context, the turbine engine provides turning power to the rotors.
Example Sentence 1
Most modern medium and heavy helicopters are turbine-powered, giving them better high-altitude and hot-weather performance than piston models.
Example Sentence 2
Turbine-powered helicopters allow quicker power adjustments during an ILS approach when wind shear changes the descent rate.