@RenegadeMan:
I´m no scientist, just a pilot, but I doubt that any realistic amount of water (waves, wash down, etc) on the rotor blades of a helicopter the size of the mighty Sea King can do much to slow them down.
Looking at the power that moves them and the mass that is in motion, I doubt that even a series of waves can have much impact.
It will shake as hell, the airflow might get disturbed, I´d get worried in the RHS but it should keep flying anyway.
Talking about salt accretion becomes a whole new story, not so much for the engines equipped with EAPS though.
Tom