Twinturboprop

Twinturboprop, also commonly written as twin-turboprop, refers to an aircraft powered by two turboprop engines. Each engine drives a propeller, and engines are typically mounted on the wings, though some designs use nose or tail installations. The configuration is used across civil and military aviation, from regional airliners to corporate and cargo aircraft.

Compared with jet twins, twinturboprops emphasize fuel efficiency at lower to moderate speeds and shorter ranges. They offer good short-field performance and the ability to operate from smaller airports, making them well suited for regional networks, remote operations, and conversions to freight or special mission roles. Acquisition and maintenance costs are generally lower than regional jets, though per-hour engine maintenance is a consideration.

Key design considerations include ensuring adequate engine-out performance, reliable propeller control, and balancing weight and aerodynamics. Many models use variable-pitch propellers with constant-speed governors and sophisticated electronic engine management to optimize efficiency and reduce noise and emissions. Modern twinturboprops frequently employ composite materials and advanced avionics to improve reliability and reduce maintenance downtime.

Typical operators span regional passenger services, corporate transport, and cargo operators, with some aircraft configured for medevac, air ambulance, maritime patrol, or surveillance missions. The two-engine layout also enables versatile wing designs and nacelles for efficiency and maintenance access.

Notable examples include the ATR 42 and ATR 72 families, the Bombardier Dash 8 (Dash 8 series), Beechcraft King Air family, Fokker 50, Saab 340 and Saab 2000, and the Dornier 228. These airframes illustrate the range of sizes, ranges, and mission profiles common to twinturboprops.