Abstract: The ball is a thin-walled hollow sphere that includes an array of apertures with dimples in a pattern that are concentric to the aperture array. Dimples are provided on the exterior surface of the ball between the apertures with the pattern and dimensions of the dimples varying based on proximity to the apertures. Internal protuberances are provided on the interior surface of the hollow ball such that the interior surface also manages aerodynamic airflow through the ball. Channels are also provided around each of the apertures within the ball which may intersect proximate dimples or be spaced therefrom. The ball also includes apertures having converging and diverging sidewalls that form a venturi shape to increase inflow air into the apertures and outflow air out of the apertures. Finally, the ball also maintains a weight:diameter ratio within a fixed range.

Abstract: The ball is a thin-walled hollow sphere that includes an array of apertures with dimples in a pattern that are concentric to the aperture array. Dimples are provided on the exterior surface of the ball between the apertures with the pattern and dimensions of the dimples varying based on proximity to the apertures. Internal protuberances are provided on the interior surface of the hollow ball such that the interior surface also manages aerodynamic airflow through the ball. Channels are also provided around each of the apertures within the ball which may intersect proximate dimples or be spaced therefrom. The ball also includes apertures having converging and diverging sidewalls that form a venturi shape to increase inflow air into the apertures and outflow air out of the apertures. Finally, the ball also maintains a weight:diameter ratio within a fixed range.

Abstract: A nacelle main frame structure and drive train assembly (10) for mounted on a tower (2) of a wind turbine (1). The nacelle main frame structure and drive train assembly (10) comprise a nacelle main frame structure (3) and at least part of a drive train (4). The at least part of the drive train (4) comprises a first connection interface (11) with the nacelle main frame structure (3) at a rotor side (R) of the nacelle main frame structure and drive train assembly (10) and a second connection interface (13) with the nacelle main frame structure (3). The second connection interface (13) is axially displaced with respect to the first connection interface (11) with respect to a direction away from the rotor side (R).

Abstract: A nacelle main frame structure and drive train assembly (10) for mounted on a tower (2) of a wind turbine (1). The nacelle main frame structure and drive train assembly (10) comprise a nacelle main frame structure (3) and at least part of a drive train (4). The at least part of the drive train (4) comprises a first connection interface (11) with the nacelle main frame structure (3) at a rotor side (R) of the nacelle main frame structure and drive train assembly (10) and a second connection interface (13) with the nacelle main frame structure (3). The second connection interface (13) is axially displaced with respect to the first connection interface (11) with respect to a direction away from the rotor side (R).