tonyscfc2

Hi to everyone been a member for a while but this is my first post, i am fairly new to model building and am having a bit of a problem, i have built a little 500 club racer, which looks good and has a very good turn of speed, for a short while, then bang everything stops the prop tightens on the shaft tried a couple of washers but it still happened , any ideas would be gratefully received.

many thanks in anticipation Tony

Aquarama

Hi Tony, have only seen the 500 on display and thought the coupling between the motor and prop shaft was rubber tube but if you are using a standard universal joint coupling I fit as follows, prop locked onto shaft with washer between nut and prop a second washer between nut and prop tube bearing with about .5mm/1mm clearance, at the motor end a washer between the brass coupling locked wth a nut still maintaining the .5mm /1mm clearance, what do you use to lub the prop tube? I use very thin grease used on CNC machines, alternativly you can fit an oil pipe and lube with 3 in 1 type oil, hope this helps, regards, Aquarama, If you still have proplem ring me on 01384 373688.

crash93

Is it threaded on both ends if so it needs a nut to tighten against the coupling , or is it lack of oil in the shaft

Peter

bleuy2

Hi Tony.
If you fit a washer between the bearing then two nuts then fit the Prop, lock the end nut to the prop with a spanner then lock the 2 nuts together with spanners leaving 1- 1.5 mm float in the shaft, do this both ends i,e. to the coupling. just to add a rider, If you can find thin spanners it will be easier, alternatively I grind them down on the grindstone. if you're using 4mm shafts the nuts usually take a 7mm spanner or a 3B.A will fit. Some people like to fit an oil tube and fill the stern tube with oil, then fit O rings to retain it as this takes less engine power to turn, I personally find this messy and prefer Marine grease and put this in through a tube just the same using a syringe without the needle to pump it in, this method stops the ingress of water up the prop tube as well as lubricating it, p.s. I do the same on the rudder tube.
I hope this helps you, it also may help others who have the same problem.
Graham. ( bleuy 2)