Waterproofing:

[pilbeam@banet.net]

Hi,
I'm thinking of building an RC submarine, and have been doing a bit
of research on the construction of it and the various systems that are
used in them. I think I understand it all fairly well, at least I hope I
do. I have been confused, though, with how to keep the water from
leaking in around the propeller shaft (or any other shaft that has to
stick out of the hull, diving planes and the like). As near as I can
tell a hole has to be drilled (obviously) in the rearmost section of the
hull to allow the propeller shaft to stick out of the stern, and the
propeller must be attached to the end of that. What devices are there
available to keep the water out of this hole, and still allow the shaft
to spin freely? Thanks in advance for the help,
Adam

[John Mianowski]

The same way any surface craft keeps water from leaking in around its
prop shafts - with stuffing boxes. I'm surprised that your research
didn't uncover something this basic.

JM

On Sat, 02 Aug 2003 23:19:07 GMT, pilbeam@banet.net wrote:

>Hi,
> I'm thinking of building an RC submarine, and have been doing a bit
>of research on the construction of it and the various systems that are
>used in them. I think I understand it all fairly well, at least I hope I
>do. I have been confused, though, with how to keep the water from
>leaking in around the propeller shaft (or any other shaft that has to
>stick out of the hull, diving planes and the like). As near as I can
>tell a hole has to be drilled (obviously) in the rearmost section of the
>hull to allow the propeller shaft to stick out of the stern, and the
>propeller must be attached to the end of that. What devices are there
>available to keep the water out of this hole, and still allow the shaft
>to spin freely? Thanks in advance for the help,
> Adam

[Bill]

That's a no brainer with a model. 2' is a usual dive. 4' an extreme. but I'm
curious about real subs. 2-3 MILES (or more) no stuffing box is going to
hold up. I wonder what the real guy's use?


"John Mianowski" <res0644m@ix-nay.am-spay.gte.net> wrote in message
news:uqaqiv8ipt86np5d69q3oomo7mi1oi1ro0@4ax.com...
> The same way any surface craft keeps water from leaking in around its
> prop shafts - with stuffing boxes. I'm surprised that your research
> didn't uncover something this basic.
>
> JM
>
> On Sat, 02 Aug 2003 23:19:07 GMT, pilbeam@banet.net wrote:
>
> >Hi,
> > I'm thinking of building an RC submarine, and have been doing a bit
> >of research on the construction of it and the various systems that are
> >used in them. I think I understand it all fairly well, at least I hope I
> >do. I have been confused, though, with how to keep the water from
> >leaking in around the propeller shaft (or any other shaft that has to
> >stick out of the hull, diving planes and the like). As near as I can
> >tell a hole has to be drilled (obviously) in the rearmost section of the
> >hull to allow the propeller shaft to stick out of the stern, and the
> >propeller must be attached to the end of that. What devices are there
> >available to keep the water out of this hole, and still allow the shaft
> >to spin freely? Thanks in advance for the help,
> > Adam
>

[Fly Higher]

"Bill" <Ziggy57345@yahoo.com> wrote in message
news:ANcXa.34522$Ne.18484@fed1read03...
> That's a no brainer with a model. 2' is a usual dive. 4' an extreme. but
I'm
> curious about real subs. 2-3 MILES (or more) no stuffing box is going to
> hold up. I wonder what the real guy's use?
>

2-3 MILES or more? You're not refering to depth I hope because only the
very special research boats make it that deep. And only a couple of them
can and not all of them are manned.

F.H.

[MIDEMETZ]

Take a look at;

http://www.rcboats.com/

There are others.

Mike
*************
>I'm thinking of building an RC submarine, and have been doing a bit
>of research on the construction of it and the various systems that are
>used in them. I think I understand it all fairly well, at least I hope I
>do. I have been confused, though, with how to keep the water from
>leaking in around the propeller shaft (or any other shaft that has to
>stick out of the hull, diving planes and the like). As near as I can
>tell a hole has to be drilled (obviously) in the rearmost section of the
>hull to allow the propeller shaft to stick out of the stern, and the
>propeller must be attached to the end of that. What devices are there
>available to keep the water out of this hole, and still allow the shaft
>to spin freely? Thanks in advance for the help,
> Adam

[Gary R. Schmidt]

Fly Higher wrote:
[SNIP]
> 2-3 MILES or more? You're not refering to depth I hope because only the
> very special research boats make it that deep. And only a couple of them
> can and not all of them are manned.
And the deep boats don't have shafts running through their pressure hulls.

Cheers,
Gary B-)

--
__________________________________________________ ____________________________
Armful of chairs: Something some people would not know
whether you were up them with or not
- Barry Humphries

[Rob]

Full-size 'normal' subs use a stuffing box :). It's quite a
complicated affair, since a prop shaft is going to be a couple feet in
diameter. I hope it's intuitively obvious that a LOT of engineering
goes into one of these.

On a R/C sub, a stuffing box will work just fine. Any sub kit will
provide the materials and instructions. There's a couple companies
that sell subs and should provide shaft stuff, as well as at least one
that sells sub 'guts' to stick in the hull of your choice.....

Tantalizing hints, eh? I don't remember a single one of the sites -
my apologies.