Hi Pavlvs
There is a hooby shop here in Nova Scotia that claims that if they don`t have a model ship propeller in stock it doesn`t exist. Here is their web site
http://www.lowellbriggshobbies.ca/
They have quite a few fittings for remote control ships like motors, couplers, shafts, etc. I hope this will help.
I converted the old Matchbox Flower Class corvette to RC over 25 years ago. It is still going strong but is in need of a refit after the attacks it has suffered over the years, water born hunter killer rotweiller, angry Canada geese, near miss from an osprey, plus I really should permantly mount the motor in the hull after all this time. I stuck it in the hull with a big lump of plasticine modelling clay. Hey it worked!
There was a Japanese company, Nichimo (spelling???) I don;t know if they are still around. They used to make a motorizing kit for their 1/200 scale Japanese battleship Yamato (???) Maybe they are still around. It allowed for 4 operational props driven by one motor. The props were attached to the shafts and looked pretty close to scale. I used then in a 1/144 scale german destroyer (scratch built balsa wood stand off scale) that I built for my nephew, more of a toy really.
Anyway try Lowell Briggs he may be able to help you.
Cheers,
John