Abstract: Fuel cell and power train (FCPT) systems are provided and adapted to being operatively mounted at a tail section of an aircraft fuselage. The FCPT systems will include port and starboard subsystems each being comprised of a nacelle adapted to being laterally attached to a respective side of the tail section of the fuselage, an electric motor contained in the nacelle, a propeller assembly mounted to the nacelle and operatively connected to and adapted to be driven by the electric motor contained therein, and at least one fuel cell positioned in the tail section of the fuselage to supply electrical power to the electric motor contained in the nacelle. One or more hydrogen fuel tanks may be mounted within the tail section of the fuselage to provide a source of hydrogen gas (H2) as fuel to the fuel cells.

Abstract: Vertical short takeoff and landing (VSTOL) aircraft include primary airfoils extending outwardly from a forward region of the aircraft fuselage, and secondary empennage airfoils extending outwardly from an aft region of the aircraft fuselage so as to be separated from the forward primary airfoils and thereby define a space therebetween which accommodates non-cyclic controllable propellers operably driven by a respective engine of a propulsion unit. The propulsion units are mounted for pivotal movement within the defined space between the primary airfoil and the secondary empennage airfoils so as to achieve a first operational position wherein the thrust line of the propellers is orientated substantially parallel to the longitudinal axis of the fuselage and a second operational position wherein the thrust line of the propellers is oriented substantially perpendicular to the longitudinal axis of the aircraft. The propulsion units may be mounted aft of the aircraft center of gravity (CG).

Abstract: Vertical short takeoff and landing (VSTOL) aircraft include primary airfoils extending outwardly from a forward region of the aircraft fuselage, and secondary empennage airfoils extending outwardly from an aft region of the aircraft fuselage so as to be separated from the forward primary airfoils and thereby define a space therebetween which accommodates non-cyclic controllable propellers operably driven by a respective engine of a propulsion unit. The propulsion units are mounted for pivotal movement within the defined space between the primary airfoil and the secondary empennage airfoils so as to achieve a first operational position wherein the thrust line of the propellers is orientated substantially parallel to the longitudinal axis of the fuselage and a second operational position wherein the thrust line of the propellers is oriented substantially perpendicular to the longitudinal axis of the aircraft. The propulsion units may be mounted aft of the aircraft center of gravity (CG).