This is way outside my expertise. but I've seen a hole in the strut supposedly to let water into the barrel. When you are sitting still the barrel should fill except for trapped air; even if nothing was forced in by forward motion is there enough of a low pressure area at the prop end of the barrel to suck the water out? If so probably not enough to suck a vacuum so it would have to pull water in from somewhere. How much water is needed to do the job? I'll bet all the motions going on in that area are violent enough to make sure fire knowledge if water is flowing through the strut bushing the way we'd like to think impossible.