Dont forget that most popouts are for saving the crew not the aircraft! I would guess that the only film you will find of an r44 in water with popouts deployed will be one that has had to use them, as no one would intentionally pop them and land on water, would they ? The risk would be far to great , as with most popouts they are not the most rugged of items.I guess you can relate them to lifejackets, some will keep your head out of water, but not all will- but they will all float you near the surface.