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Not for nothing QMII is powered by a DE system as the engineers and designers that developed her forsee or have reckoned with the fact that we are in - probably - the last stage of the fossil fuel era. If not for quantitative oil shortage it might another, more pressing reason that might add more complexity to this global query: the increase of global temperature.
What can be in the long run an extra asset to the installation of DE propulsion is the fact that - next to all the other advantages of DE propulsion - any type of engine can be mounted to power the electric supply-system.
Whatever turns up as a second generation source of power, it always can be connected to the already existing electric propulsion system.
What will be next to the combustion engine is still a riddle - for the large yachts say, 50 meters plus - can be equipped with miniaturised nuclear powerplants that powers a small steamturbine that powers the generator that supplies the electric energy for the propulsion.
Unless another type of engine may see the light. What surprises me is that one still talks about ill feasible systems like solar energy and the lot. Solar energy might be capable to power little apliancies over unspecified distances, but the larger yachts with their small city demands of electrical power, will be the first victims when someting unforseen happens to the present oil-supply.
In such a case it will definately do no harm to install a DE system that has also other practical advantages: reduction in maintainance, reliability, reduction of noise, full torque at all speeds, increased fuel economy, keeping similar powerspecs to traditional applications.
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