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[merseyferry]

 hi again all ,why does the propeller keep tightening when the motor turns.. the set up ive got is from propeller end ... propeller lock nut, washer, shaft  ,,, other end . washer, locknut coupling motor.

[Martin (Admin)]

I would suggest a little 'nail polish' on the threaded areas to lock them in place.
( Loctite or superglue may be too  strong in this application )

[imsinking]

You have to lock the nut against the prop tightly, finger tight wont do , same the other end lock the nut against the coupling . . .making sure there's no excess end float , the bigger the gap the more water gets into the stern tube, a big problem if your shaft set up is below the water line completely 
I've used M3 stainless grub screws for years in both the props & drive end , plastic props not easy, all brass is totally safe . . .tend to strip the threads to easily in the plastic props , so don't over tighten . . .
Isn't model boating FUN 
Bill

[malcolmfrary]

The common mistake is to hold the shaft and wind the locknut against the prop or coupling, which gives the appearance of a locknut, but isn't locked.  Hold the prop to tighten its nut, hold the coupler to tighten that one.  As suggested, adding a drop of thread locking compound helps.

[merseyferry]

thank you gents.. still amasses   me how helpful mayhem members are