This hovercraft has a compact and streamlined top layout that reduces unnecessary airflow disturbances and drag.
The black section forms a smooth tunnel around the propeller (a duct), which guides the airflow in a controlled and straight direction.
By enclosing the propeller in this tunnel, air losses to the sides are reduced and more of the generated airflow is converted into useful thrust.
This improves efficiency, stability and steering response, while keeping the overall shape short and clean, which contributes to good aerodynamic performance.

From the front view, the hovercraft clearly shows a circular duct around the propeller.
This round tunnel creates a smooth and uniform inlet for the airflow, reducing flow separation and turbulence before the air reaches the propeller.
Because the air is guided straight into the duct, the propeller operates in a more stable and efficient flow field.
As a result, more thrust is generated with less energy loss, which improves forward performance and directional control of the hovercraft.