A Turboprop airplane. this can reach 600+ knot. anyway, the engine inspirated by Tupolev tu 114. and here the explanation how ghis engine works. >>>>>>> The Tu-114 is a large turboprop airliner that uses a unique engine configuration: four Kuznetsov NK-12MV turboprop engines, each driving two contra-rotating four-bladed propellers. This means that each engine has two propellers that rotate in opposite directions.How contra-rotating propellers work: * Improved efficiency: When two propellers rotate in opposite directions, they create a slipstream that helps to reduce drag. This results in improved fuel efficiency and increased speed. * Reduced torque: The opposing rotations of the propellers help to counteract the torque that would otherwise cause the aircraft to yaw. This makes the aircraft more stable and easier to control. * Increased thrust: The combined thrust of the two propellers is greater than that of a single propeller. This allows the Tu-114 to achieve high speeds and climb rates.How the Tu-114 engine works: * Turbine: The engine's turbine uses the hot exhaust gases from the combustion chamber to spin a shaft. * Compressor: The shaft drives a compressor, which sucks in air and compresses it. * Combustion chamber: The compressed air is mixed with fuel and ignited in the combustion chamber, producing hot gases. * Turbine shaft: The hot gases expand and spin the turbine shaft, providing power to the compressor. * Propeller shaft: The turbine shaft also drives a propeller shaft. * Gearbox: The propeller shaft is connected to a gearbox that reduces the rotational speed and increases the torque. * Propellers: The gearbox drives two contra-rotating propellers, which produce thrust.The Tu-114's contra-rotating propellers are a unique feature that helped to make it one of the fastest and most efficient turboprop airliners ever built. ///////// Anyway you can change it intoo your custom airline.