C90 GT - latest Twin engine Turbo Plane
 

An aircraft propeller is an aerodynamic device which converts rotational energy into propulsive force creating thrust which is approximately perpendicular to its plane of rotation. The rotational energy can be produced by a piston or gas turbine engine or, in limited applications, by an electric motor. A propeller can be attached directly to the crankshaft of a piston engine, as is the case in many light aircraft, or it might be powered through a reduction gear box (RGB) attached to a piston or jet engine. In this case, the RGB converts the high rotation speed of the engine to one that is more appropriate for propeller operation. Propellers have two or more blades spaced evenly around the hub and are available in fixed pitch or in variable pitch configurations. More sophisticated propeller designs include those of the constant speed, contra-rotating and counter-rotating types.

The C90 GT is a twin turboprop that is typically outiftted with one and half cabin zones and has a range of 840 nm. There were 605 produced from 1971 - 1992.  A “pioneer of the King Air family,” the C90 was a derivative of the Queen Air and in 1964, the 65-90 was the first King Air 90 series variant to be delivered.