Variable Elliptical Trailing Edge Rotor Blade

The patent applies local quality by implementing an elliptical arc shape specifically at the trailing edge region of the airfoil, while the rest of the airfoil structure maintains conventional geometry. This localized geometric modification optimizes aerodynamic properties at the trailing edge without compromising the overall structural integrity of the blade, as the elliptical shape is confined to a specific region rather than the entire structure.

The patent employs spheroidality by introducing an elliptical arc shape at the trailing edge of the airfoil. The elliptical geometry provides smooth curved surfaces that reduce flow separation and improve aerodynamic performance. The specific elliptical configuration with defined major and minor axes creates optimal curvature characteristics that enhance airflow attachment while maintaining structural soundness.

The patent resolves this contradiction by applying the elliptical arc shape only to the trailing edge region, allowing structural optimization in other critical areas of the airfoil. The localized application ensures that structural robustness is maintained in load-bearing regions while aerodynamic efficiency is enhanced specifically where the elliptical geometry interacts with the flow field.

The elliptical arc configuration provides optimal curvature that balances aerodynamic performance with structural considerations. The smooth elliptical transition avoids sharp corners that could create stress concentrations, thereby maintaining structural integrity while achieving superior aerodynamic characteristics in the trailing edge region.