Assertion: hovercraft's skirt | /r/CapableOf | act as natural ducting
Facets:
Source sentences:
text: If air is fed through ducts in the top hull so that it inflates the skirt and then is allowed to escape through holes on the inside edge of the bag into the plenum area, the skirt acts as natural ducting, and by varying the size of the holes it is possible to vary the pressure ratio of bag inflation to plenum pressure.