English

Noun
en-noun|sg=propwash deflection unit

1. A Propwash Deflection Unit, also known as a PDU or deflector is a device that is placed over or behind the propeller of a boat to deflect the vessel's propwash downward. The result is a very effective form of agitation dredging. PDUs are primarily used by salvors to remove mud or sand from shallow water shipwrecks.

References
http://www.fknms.nos.noaa.gov/regs/fmp2.pdf
http://www.shipwrecks.com/ethics_in_underwater_archaeology.htm

• 2006-10-26 17:14 - Connel MacKenzie - ===Hdr===, {{infl}} (en), [[User:Connel MacKenzie/Format|fmt]]

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