Differential Thruster Rotation for Hover and Forward Flight

The patent resolves this contradiction by making the duct surface area dynamically adjustable through rotation. The full-length ducts that maximize thrust during forward flight are rotated into positions where they do not interfere with main rotor downwash during hovering. This allows the system to have large duct surfaces for maximum thrust potential while minimizing their harmful exposure to downwash through dynamic repositioning.

The patent applies dimensionality change by introducing a rotational degree of freedom to the ducted fan assemblies. Instead of simply increasing or decreasing duct surface area, the system rotates the ducts into different angular positions around the fuselage. This adds a spatial dimension (angular position) to the problem, allowing the ducts to be large when needed while avoiding downwash by changing their orientation rather than their size.

The patent applies dynamics by implementing rotatable ducted fan assemblies with adjustable angular positions. Each assembly can be independently rotated to different orientations, enabling the system to manage torque effects during hovering by positioning ducts to counteract main rotor torque, and to optimize thrust vectors during forward flight. This dynamic capability provides adaptability without requiring complex active control systems.

The patent applies multi-functionality by designing the rotatable ducted fan assemblies to perform multiple functions: they provide forward thrust during high-speed flight, generate vertical lift during hovering, and counteract main rotor torque through differential positioning. The same basic structure serves all these functions by simply changing its angular position, avoiding the need for separate systems for each function.