10mm shaft seal

[single]

I'm helping my son with a project that requires a 10mm diameter stainless prop shaft to pass through the hull.How can we make a good waterproof seal? I can't imagine there are stern glands that small.

 

[earlybird]

First thoughts:- Lip seals, but probably with specially made cartridge or can you arrange a fixed tube that rises above the waterline?

 

[single]

First thoughts:- Lip seals, but probably with specially made cartridge or can you arrange a fixed tube that rises above the waterline?

I was thinking fixed tube but not sure about friction /heat.

 

[earlybird]

I was thinking fixed tube but not sure about friction /heat.

I was thinking that the water finds it's own level. No need for a close fit. Assuming a straight tube.
Some old mechanical logs, eg Wasp, just had a long flexible cable like a speedometer, with no particular rotating seal AFAIK.

 

[single]

Its pretty much on the waterline. How about a 10mm pipe compression fitting but rather than a copper olive use some sort of packing?

 

[Bilgediver]

Its pretty much on the waterline. How about a 10mm pipe compression fitting but rather than a copper olive use some sort of packing?

http://www.bearings-direct.com/vmchk/Metric-Oil-Seals/View-all-products.html

Less than a pound each for 10 mm seals. If worried hen fit two in the same cavity

 

[alan17]

http://www.bearings-direct.com/vmchk/Metric-Oil-Seals/View-all-products.html

Less than a pound each for 10 mm seals. If worried hen fit two in the same cavity

If the 1st seal does its job no water will reach 2nd seal. This would cause 2nd seal to run hot so plenty of grease when you assemble.