propwash deflection unit
nounDefinitions
A device placed over or behind the propeller of a boat to deflect its prop wash downward…
A device placed over or behind the propeller of a boat to deflect its prop wash downward as a very effective form of agitation dredging, primarily used by salvors to remove mud or sand from shallow-water shipwrecks.
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sense glosses and etymology drawn from English Wiktionary · source · CC-BY-SA