wire drag

wire drag

[′wīr ′drag]
(engineering)
An apparatus for surveying rocky underwater areas where normal sounding methods are insufficient to ensure the discovery of all existing submerged obstructions, small shoals, or rocks above a given depth or for determining the least depth of an area; it consists essentially of a buoyed wire towed at the desired depth by two launches.
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References in periodicals archive ?
During WW1 the British achieved bracing wire drag reduction by developing streamlined wire cross sections, but the Germans achieved further drag reductions by using cantilever wing structure with much fewer bracing wires.