Editing Gas turbine (section)

===Turboprop engines===
A [[turboprop]] engine is a turbine engine that drives an aircraft propeller using a reduction gear to translate high turbine section operating speed (often in the 10s of thousands) into low thousands necessary for efficient propeller operation. The benefit of using the turboprop engine is to take advantage of the turbine engines high [[power-to-weight ratio]] to drive a propeller, thus allowing a more powerful, but also smaller engine to be used.<ref name=":1" /> Turboprop engines are used on a wide range of [[business aircraft]] such as the [[Pilatus PC-12]], [[commuter aircraft]] such as the [[Beechcraft 1900]], and small cargo aircraft such as the [[Cessna 208 Caravan]] or [[De Havilland Canada Dash 8]], and large aircraft (typically military) such as the [[Airbus A400M]] transport, [[Lockheed AC-130]] and the 60-year-old [[Tupolev Tu-95]] strategic bomber. While military turboprop engines can vary, in the civilian market there are two primary engines to be found: the [[Pratt & Whitney Canada PT6]], a [[free-turbine turboshaft]] engine, and the [[Honeywell TPE331]], a [[fixed turbine]] engine (formerly designated as the [[Garrett AiResearch]] 331).