Mast erection via ground anchor uses radial flank projection round mast end piece to form screw clear of mast socket inwall to allow filler grain anchoring.

摘要

The end section (9) of the mast (1) has a radial projection (10) to describe a helix whose outside diameter is such as to leave a gap between this and the inside diameter of the socket (6) equal to the filler (8) size. The projection makes a sheet flank to form part of the mast end (9) screw. The projection can also form propeller blades and the socket (6) cones upwards and is matched here by the conical end part (9) of the mast. The gap between projection and socket (6) inwall amounts to 2-2.5 times the filler grain size.