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Another issue is prop-walk. If there are two screws that are counter
rotating this is less of an issue, but you get an additional vector thrown
into the mix from the "paddle wheel" behavior of props. Not only does a
prop thrust water backwards, it also provides a sideways force (I've seen
this in aircraft prop wash as well). This force can be welcome when going
into or out of a dock, it can also be very annoying.