Basically this plot is why. Efficiency versus speed characteristics due to aerodynamics of propellors versus cowled rotors. Turboprop for short low flights, hig

Basically this plot is why. Efficiency versus speed characteristics due to aerodynamics of propellors versus cowled rotors. Turboprop for short low flights, high bypass turbofan for long and high flights. https://en.m.wikipedia.org/wiki/Propulsive_efficiency#/media/File%3APropulsive_efficiency_for_different_engine_types_and_Mach_numbers.png https://en.m.wikipedia.org/wiki/Propulsive_efficiency#/media...