Prairie (acronym: propeller air-induced emission holes are fitted either near to or on the ships propellers leading edge and compressed air is pumped through small holes in those edges of the propeller to change the signature of the ships propeller while underway.
The Prairie Air System, which some navies have been using to reduce propeller cavitation and, to a lesser extent, hull noise, for years. This method involves channelling air along the leading edge of the blade. Similar systems are being developed for commercial ships.
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