I read with interest that the new Jongert 47 meter Revolution yacht will use pod drives instead of traditional shaft/propeller. Pod drives have been used by large commercial vessels for some some -- I think there is a brand called Schottell that is used by tugboats. I believe several cruise ships have been built using pod drives. I wonder why pod drives have not been developed for super yachts or mega yachts prior to now. Pods have spread into the medium yacht market quite quickly and have shown to provide improvements in efficiency and handling over traditional shaft drives. No doubt there are knowledgeable members of this blog who know why the large yacht market has been slow to adopt pod drives.