1. A turboprop propulsion system adapted for use in an airplane having an airframe, the turboprop propulsion system adapted for fixed connection to the airframe, the system comprising:a propeller mounted for rotation about a propeller axis,
a gas turbine engine mounted to establish an engine axis of rotation different from the propeller axis to form an offset angle therebetween, and
a gearbox coupled between the propeller and the gas turbine engine and configured to accommodate the offset angle between the propeller axis and the engine axis of rotation,
wherein the propeller axis and the engine axis of rotation are fixed with respect to each and are located within a single nacelle.