The mass -displacement system over open areas containing air -displacement components mounted on the support elements shall be characterised by the fact that each of at least three radii of a district designated in the airborne area, separated from each other in r at the same angular distance, at least one air -forcing element (W1, W2, W3) shall be positioned towards the centre of the circle, generating a flow stream of air of at least 4700 m3 /s, seated on the supporting element. The height from the base plane of the propelling element to the axis of attachment of the air -moving element (W1, W2,W3) is contained in the range of 40m to 60m. In the centre of the district, for each of the rays (L1, L2, L3),where the air force (W1, W2, W3) is positioned towards the centre of the circle, the central air force force (C1, C2, C3) is positioned upwards, generating an air stream of at least 4700 m3 /s, seated on a support element of which high st from the base level to the axis of attachment of the central force of air shall be within 40m to 60m.
