Way back in 1931, Mr. Wiggly made a number of experiments on a wedge shaped body as I have shown you and he gave very interesting results, which was experimentally found to be correct. First, he said that, there is a constant pressure distribution around the hull shape actually, he said there are five wave system; we have seen here four, there is a fifth one, a wave which as if stays with the ship, does not move, it does not take any energy, but a pressure, a basic pressure difference develops because of the shape of the body and such a pressure difference is the one we had seen before, sorry.