1. In a method of operating an aircraft system having an airframe with attached right and left airfoil means, spaced-apart forward and after rotatable flap members in each airfoil means that define a lift ejector diffuser section having an included divergence angle, power plant means operable at different rotational speeds to produce different corresponding high-energy primary fluid flows, and duct means selectively distributing primary fluid flows from the power plant means to the lift ejector diffuser sections defined by said flap members in said airfoil means, the steps of varying the operating condition of the aircraft system in flight comprising: operating the aircraft system to an airframe flight condition; operating said power plant means at a constant rotational speed and output power to produce a corresponding total primary fluid flow; distributing said total primary fluid flow to said lift ejector diffuser sections in proportions divided equally between said right and left airfoil means; and thereafter changing the flight condition of the aircraft system and said airframe by rotating said forward and after flap members in opposite directions with respect to each other in each said airfoil means to change the divergence angles of the lift ejectors defined thereby and maintaining the rotational speed, output power, and total primary fluid flow of said power plant means and the proportional distribution of said total primary fluid flow to said lift ejectors in said right and left airfoil means constant.

4. In a method of operating an aircraft system having an airframe with attached right and left principal airfoil means producing principal aerodynamic lift during system forward flight aLong the system longitudinal axis and with right and left secondary airfoil means positioned more distant from the system center of gravity than said principal airfoil means and producing stabilization aerodynamic lift during said forward flight, spaced-apart forward and after rotatable flap members in each airfoil means and defining a lift ejector diffuser section having an included divergence angle, power plant means operable at different rotational speeds to produce different corresponding high-energy primary fluid flows, and duct means selectively distributing primary fluid flows from the power plant means to the lift ejector diffuser sections defined by said flap members in said airfoil means, the steps of varying the operating condition of the aircraft system in flight comprising: operating the aircraft system to an airframe flight condition; operating said power plant means at a constant rotational speed and output power to produce a corresponding total primary fluid flow; distributing said total primary fluid flow to said lift ejector diffuser sections in proportions divided equally between said right principal and secondary airfoil means and said left principal and secondary airfoil means; and thereafter changing the flight condition of the aircraft system and said airframe by rotating said forward and after flap members in opposite directions with respect to each other in each said airfoil means to change the divergence angles of the lift ejectors defined thereby and maintaining the rotational speed, output power, and total primary fluid flow of said power plant means and the proportional distribution of said total primary fluid flow to said lift ejectors in said principal and secondary right and left airfoil means constant.