The Rotodyne was in mind when I mentioned that I would bring my own ear defenders Duncan.
Not really necessary in my case because I am already deaf, caused by diesel exhaust gas being expanded through a nozzle. Turbochargers.
But I accept that noise is the most difficult technical problem that will need to be overcome if the concept is taken up, even on non passenger ships.
However, the Fairy design actually had jet engines in the rotor tips, I am suggesting directing existing exhaust gas trough nozzles. Not quite in the same league regarding noise generation but still a problem I fear.