Airframe of a volitant body

A flying device comprising:

• a propulsion system;
• and
• an airframe, the airframe comprising:
• a body comprising:
• an interior surface defining a central air passage permitting a flow of air through the body, the central air passage having an air inlet and an air outlet, wherein the interior surface is configured such that the air inlet tapers from a wide end to a narrow end, the wide end being open to an ambient environment, wherein tapering of the air inlet produces a Venturi effect in the flow of air passing through the central air passage from the air inlet to the air outlet by choking the flow of air at the air inlet;
• an exterior curved surface;
• and
• a set of side airflow passages spaced around the body, individual side airflow passages having individual side inlets at the exterior curved surface of the body which follow a contour of the exterior curved surface, the individual side airflow passages having individual side outlets that open into the central air passage, such that the individual side airflow passages permit individual flows of air from the ambient environment into the central air passage.