Very INTERRRRRESTING
Don't forget, raflaunches that these quoted thrusts are STATIC thrust for ducted fans - it increases radically as the fan starts to move and I can't quirte remember then it peaks - I seem to remember its when the vehicle speed is 50% of the jet velocity.
There won't be much published data on boats use with d/f, but you could regard it as a staggeringly draggy plane and see what can be learned that way
Generally tiny diameter high-speed D/F s are used for high speed aircraft. Trainers etc use relatively large fans running slower.
Many areomodellers use home-rolled fan ducts with cut-down aero props and achieve very good results
red and silver?
andrew