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You don't work much in the water under the aircraft I am guessing Jim?
Although we sometime feel like the hills of Wester Ross are as wet as the nearby ocean, generally, that would be a no!
Where downwash is a problem for us is on steep ground, narrow ridges, and avalanche-prone terrain. One can train MRT to deal with working under heavy downwash but the problem remains of persons in distress, and other members of the public, who have no comprehension of the forces involved.