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[terry1956]

Hi, I need a bit of advice. First do I need to feel the prop shaft with grease, and second the end nuts on the shaft, do I screw them up towards the shaft or towards the prop.
And just one more question. My propellers are handed, so I have been told. How do I know which is left hand or right if I am looking at the model from the rear. Thanks.

[Colin Bishop]

People have their own ideas on how to do things. Glynn Guest's article is worth a read as it explan's things simply.

https://www.modelboats.co.uk/news/article/drivelines/27166

As Glynn says, filling the tube with grease can seriously overload the motor, it has happened to me. These days I just grease the shaft with teflon or waterproof grease to stop any corrosion and apply some grease to the inboard bearing. The bearing at the propeller end is effectively water lubricated.

This recent thread on the Model Boats magazine website is also useful:

https://www.modelboats.co.uk/forums/postings.asp?th=186255&p=1

As far as left hand and right hand is defined there is discussion on this site:

https://www.modelboatmayhem.co.uk/forum/index.php?topic=56904.0

https://www.modelboatmayhem.co.uk/forum/index.php?topic=35415.0

With twin shafts you need to decide whether you want the props to be outward or inward turning as this can affect steering charateristics depending on the boat and the rudder configuration.

Colin

[terry1956]

Thank you Colin, for all the information and links. If I have this correct. One motor needs to be reversed to suit the propeller rotation. But what’s the best way of stopping the prop shalf at the coupling end undoing itself. Will the lock nut hold it. If so surly it must be locked at the prop shaft end towards the outer casing and not locked up to the coupling face as both would just undo. Michael

[Shipmate60]

Michael,
I screw locknut for the prop right to the end of the thread. Hold the shaft in a small vice with a rag round it. Screw the propellor either to the locknut or as far up the thread as it will go. Tighten the locknut to the propellor, fit a washer behind yjr locknut and adjust inside the model to ensure  only a tiny amount of play in the endfloat. I use light teflon grease inside the shaft.


Bob

[terry1956]

Thanks. I now find that the prop shaft is unscrewing from the coupling end.

[dougal99]

you need alock nut at both ends. One against the prop and one against the the coupling. This will stop any unscrewing.

[Shipmate60]

If the shaft has a thread and the coupling id threaded just add a washer to the inner end and tighten to the locknut.


Bob

[Colin Bishop]

If the shaft is only threaded at one end (for the prop) then secure the other plain end with a collett/collar of the right diameter. - something like this one from Technobots.

https://www.technobotsonline.com/zinc-collets-4mm-pk-4.html

Colin