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[Perks842]

Hello all, I have graupner 2mm shafts 4mm outer and I need to put grease in them however this is my first boat and I've never done this, could someone please advise? and also the best grease for the water resistant properties.

thanks.

[Shipmate60]

I use a small syringe, I suck up a little grease and "inject it into the outer shaft.
As to which grease, it seems everyone has their own favourite which works.
Try using the search facility and there should be lots of ideas for you to choose from.

Bob

[longshanks]

Cornwall Model Boats now doing grease and oil for propshafts

http://www.cornwallmodelboats.co.uk/acatalog/prop_shaft_accessories.html

Take your pick

[tt1]

Hello Dan, have been told by many model builders and two manufacturers of model boat kits, that good old vaseline is as good as anything and as cheap as chips as they say.
      I'm new to modelling so cannot talk from experience but have used it and given my first model some long run times very recently, no problems and no water ingress as yet - time will tell!

Do you have an "oiler" tube fitted on your prop shaft tube?  I use the same method as Bob, think the syringe is about the most universal method.

        Good luck with the build, regards, Tony.                 

[Shipmate60]

tt1,
Vaseline is only good as long as you can remove the shaft easily.
Over time it goes almost solid which increases the friction on the shaft and therefore the current consumption.
It is fine if you can clean it out and regrease regularly.

Bob

[Perks842]

Graupner shafts have injection holes on them which I have installed facing upward for ease of access, will try the syringe method with shaft grease. thanks.

[Colin Bishop]

Don't be surprised if you do get a few drops of water in after a sailing session - this is common and not something to be concerned about.

Colin

[Peter Fitness]

I use outboard motor grease, injected with a syringe via a grease tube silver soldered to the prop tube.

Peter.

[HS93 (RIP)]

you have a 2mm inner and a 4mm outer that leaves less than 0.25  clearance, if you use grease it will draw lots of amps unless the shaft is fully under the waterline and horizontal use oil, a few drops before running 3in 1 will do.  if you had a lot of clearance yes grease is an option (that I never use) but the amount of drag with grease can be to much for very small motors, by the way the manufactures call them shaft oilers for a reason, and not grease points..
this is my view anyway
peter 

[Peter Fitness]

Peter, I've never had a problem with excessive current draw using grease, and all my prop tubes are inclined, and partly above the water line, but I am using 540 type motors, or bigger. I also use 4mm shafts in 6mm tubes, so there is more clearance. However, I can see how smaller motors may be affected, especially with such a small clearance.

Peter.

[HS93 (RIP)]

peter I put UNLESS your shaft is fully under the water line, so if it is above there is no reason to worry about leaks , just put a silicone O ring at the top next to the coupling if you have problems, I was allowing 0.25 for wall thickness some are thicker a lot thicker that would make getting grease in difficult to be off any use. there are some off us who use oil and some use grease I was just putting the option to grease and why.
just out of interest have you ever done any amp test with a fully greased shaft and an oiled shaft you would be supprised.
 
Perks842 out of interest what type of boat is it and what motor ?

peter

[Peter Fitness]

Sorry, I misread that.

I do use O rings as you suggest, and have had no trouble with water ingress, although a small amount grease can get flung out inside the hull by the shaft rotation. I usually put a small shield made out of thin brass plate just above the coupling to contain the grease.

Peter.

[Perks842]

 
Perks842 out of interest what type of boat is it and what motor ?

peter

Fletcher class destroyer with small motors

[Shipmate60]

You will need a very thin grease, a bit expensive but very good is fishing reel grease as it is waterproof, low drag and thin.

Bob

[essex2visuvesi]

this stuff is bloody good....

http://www.rcplanet.com/Traxxas_Silicon_Grease_p/tra1647.htm

(works well on your car window channels as well )