Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jan 11, 2008 10:34:43 GMT 1
Hi all, I bought an interesting magazine, (or to me it was) called Model Boats.
A UK one with a bit about prop shaft lubrication, suggesting the use of engine oil, (Glynjn Guest, (writer of the article on page 61 of the winter edition) suggested using SAF:2QF50 type engine oil to lubricate the prop shafts rather than grease as the grease was causing too much drag on the motor and mking it overheat.
This got me thinking if anyone had thoughts about lubricating their prop shafts and with what ?
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jan 11, 2008 10:36:06 GMT 1
Oooooops a slight typo in the name of the person it's Glynn Guest and I was unable to find anything about the article on the website without registering. the website is www.modelboats.co.uk/
|
|
|
Post by nm on Jan 11, 2008 11:39:42 GMT 1
I sympathise on the typo: (and I just mis-spelt "typo"!). Often when I send a post I have to send a correction.
Then I noticed the "modify" button - I'll try it the next time.
NM
|
|
|
Post by markus on Jan 11, 2008 16:05:16 GMT 1
i use normal ball bearing grease for lubrication
this raises the motor's current drain a bit, but it remains much longer in the propshafts
when using engine oil you'll have to re-apply it everytime you run the ship
markus
|
|
|
Post by popeye on Jan 14, 2008 13:27:05 GMT 1
If you go to your local plumber's merchant, a good hardware shop or possibly a very good kitchen/cooking equipment shop you can get a small tub of white (food grade) silicon grease. This is mainly for greasing pipes, gears etc., to be used in food preparation machines (I use it in my homemade wine, mead, cider and champagne equipment, such as the fruit/grape press). It is a good quality grease that has a fairly low coefficient of friction and is environmentally friendly (i.e. if you can use it on food products then it shouldn't harm the ducks in the pond!).
The other options are molyslip grease (from most car part shops - e.g. Halfords (in the UK)), usually comes in a toothepaste-sized tube as well as tubs, graphite grease (although this is a bit messy) and, if you can find it, PTFE grease (this has a very low friction but is expensive).
|
|
|
Post by swanrail on Jan 14, 2008 18:40:30 GMT 1
Thanks for the info. I hope that you are going to knock up some 200 miniature bottles of champagne for when we get to the official launching of all our Bismarks!!!!
|
|
|
Post by eric on Jan 14, 2008 23:10:01 GMT 1
I've ordered my brass props in M2 thead today from Sitek propellers, he's only charging £18.52 incl P&P for all three props. Really looking forward to getting them, but I'll have to wait at least 3 weeks as he's snowed under with work. As a rule he dosn't do M2, only M3or M4, but he will put in an M2 insert into M4 thread, should work fine! His web site is www.gsitek-props.co.uk/Nice friendly chap.
|
|
|
Post by Mark on Jan 16, 2008 5:24:17 GMT 1
Good advice from Popeye. I'd go with a low friction grease, maybe vaseline as it's easily available. A heavy grease will certainly put a high load on the motor, especially as this is a relatively low powered model. It might be worth seeing what the model car people use for greasing diffs. That might yeild something suitable.
Great link from Eric, thanks. I shall probably get the A-frames for my model there. I plan on just having the tubes sticking out of the hull a little bit, shortening the tubes of course, and then supporting the shaft with a functional A frame. I.e. Same as the original vessel.
The down side is that as the shafts will then be painted, they probably won't withdraw through the bush in the A frame easily, so I'll have to add a grease nipple inside the hull somewhere so I can grease them easily.
|
|
|
Post by griffin247 on Jun 5, 2008 17:17:53 GMT 1
i might be stupid but my last boat at least 5 yrs ago had seal shafts allready greased , it seems on this one the shafts are open with no end caps to be able to fill them with lub
|
|
|
Post by markus on Jun 5, 2008 18:05:31 GMT 1
i might be stupid but my last boat at least 5 yrs ago had seal shafts allready greased , it seems on this one the shafts are open with no end caps to be able to fill them with lub indeed, you'll have to remove the inner shaft in order to get the grease in... markus
|
|
|
Post by griffin247 on Jun 5, 2008 19:54:47 GMT 1
i might be stupid but my last boat at least 5 yrs ago had seal shafts allready greased , it seems on this one the shafts are open with no end caps to be able to fill them with lub indeed, you'll have to remove the inner shaft in order to get the grease in... markus erhm yes but theres no cap ends to stop it coming out
|
|
|
Post by markus on Jun 5, 2008 20:04:24 GMT 1
indeed, you'll have to remove the inner shaft in order to get the grease in... markus erhm yes but theres no cap ends to stop it coming out ....they have sinter bearings on both ends which keep the grease inside
|
|
|
Post by griffin247 on Jun 5, 2008 22:46:24 GMT 1
ohps mine dont
|
|
|
Post by swanrail on Jun 6, 2008 0:00:06 GMT 1
The ones Markus supplied do. I removed the shaft(s), injected car grease at the outboard end until it started to come out of the inboard end, then reinserted the shaft. My Br Chancellor has scratch built prop tube into which I fitted a car grease nipple (remember the good old days, when you could spend many a happy hour under a car greasing it??), then each time I sail her it is easy to top up using a grease gun. Much bigger tube though. Ref the drag, as my boats only proceed in a sedate manner, the revs are low and hence not too much drag. to my mind, most models go much to fast!!!!
|
|
|
Post by poulw on Jun 6, 2008 1:39:03 GMT 1
Re speed:
I don't want to bring this thread off topic, but I agree with Swanrail. Most models are sailing way too fast.
In real life, a ship sailing at 25 knots (45 km/h) will cover a distance of 750 meters per minute.
Ie. a battleship like the Bismarck would take 20 sec. to cover a distance her own length.
When you look at most R/C models, this is done in about one to two sec. - representing a speed of around 250-500 knots (which is the speed of aircrafts)
|
|