BAG SKIRT: Older versions of hovercraft used continuous skirt which look like an inner tube.

DRAG FLAP: Flap under rear skirt which prevents skirts from scooping up water and increasing drag.

FAN DUCT:  The circular structure around the fan which assists its efficiency and houses the air straighteners.

HOVERHEIGHT: The height of the hard structure above a hard surface at operating speeds.

HUMP: When starting on water the lift-air creates a saucer in the water and climbing out of it is called flying over hump.

ON CUSHION: The position of the hovercraft when the hard structure is clear of the surface riding on it's cushion of air.

SEGMENTED SKIRT: Skirt made up of individual pockets, segments of fingers, each seperately supplied with lift-air.

SKIRT TIES:  Plastic ties which hold the skirt segment to the skirt tie anchor on the hull.