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Water tight motor containers - Water proof motor containers

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Postby smwarships » Tue Jul 22, 2003 11:06 pm

Hello Group ,

Does anyone make water proof containers for the electric
motors that we all use in our R/C Submarines ?? ???

I plan on using water proof servos in my sub in order to
cut down on the size of my WTC and this will also cut
down on the weight that I will have to add for ballast
making my sub lighter in weight also . :D

I want to put my motors in their own containers so I don't
have to worry about shaft seal leaks .....

Darle
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Postby D Manley » Tue Jul 22, 2003 11:25 pm

I was thinking of doing the same thing, but I just don’t know how popular these items would be!
So who here would be interested in something like this and what kind of futures and or arrangement would you guys like to see in these parts?

Dave Manley
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Postby JIMJAM » Tue Jul 22, 2003 11:48 pm

Not sure what you are up to but sounds like making something kinda simple really complicated. You would still need to have your reciever, ESC and other electronics in a sealed container. Servos side by side with say a few inches of pushrod to the exits does not take that much more space. Any weight loss but be negated by the sealed motors you intend and motors do not like to be sealed in a large container much less a sealed case. I say keep it simple and have everything in one container.Minumizing the number of entry points for water makes life easier and having alot of smaller a more numerous waterproof items just increases the chances and headache of trying to keep the water out.
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Postby 70-1048541373 » Wed Jul 23, 2003 11:51 am

Hi All,

I did something similar..but thru nessessity vs. desire. I put my depth control unit in it's own WTC because there was'nt room in the main. Instead of using connectors, I just made sure the wires where long enough to be able to install one then the other without problems. I figured there was'nt going to be a time that I'd want to seperate them unless I was going to open one or the other anyway!

Consider forgetting connectors and just make sure there is enough excess wire to handle one while the other is installed...just dont get too crazy in the length.

Just an idea,
Mike
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Postby Art Broder » Wed Jul 23, 2003 7:32 pm

Darle,
I succesfully use a separate container, or WTC, if you prefer that terminology, for the drive motor in my subs. The advantages are that I can open or remove the main electronics WTC, or realign it, without disturbing the motor or drive shaft alignment, I don't need to use a dogbone, and I can remove or replace the motor without opening or changing the main WTC. The drive shaft is also kept much shorter with this arragement. The latest container is a metal cylinder which helps diissipate heat. The motor is fan cooled, as well. Hope this information is helpful.
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Postby smwarships » Wed Jul 23, 2003 9:06 pm

Hi Art and Group ,

Art your design sounds interesting . Do you have any photos
of your setup ?
How do you have your shafts and motors setup without a
dog bone connection ??
What made you decide to use a metal cylinder ? ???
If you have any photos you woulfd like to share , please
send them to dwb4926@yahoo.com .

Thank you for your time and help , :D
Darle
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Postby Feet Wet » Thu Jul 24, 2003 7:10 am

I've heard of and used "waterproof" servos.They did not remain waterproof for long.Water resistant, yes, but waterproof , no.
Separate WTC's can be accomplished many ways.I'm using two almost three feet apart.I connected them with PVC tubing and hose. This "pipe" is in three pieces to allow break down and threading servo wires .All connections are made with reinforced PVC hose and hose clamps. The system works well.No leaks, no changes in bouyancy, no problems.
I would keep ALL my electronics in WTC's.
Cheers
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Postby smwarships » Thu Jul 24, 2003 1:25 pm

Hello Feet Wet,
What method did you use to water proof your servos ?
I use tool dip and apply 3-4 coats then let the servos dry
for a couple of days before testing and this works very well.

I am working on WTMC's right now and should be ready to
test them by Saturday afternoon . :D

Darle
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Postby Art Broder » Thu Jul 24, 2003 1:45 pm

motor WTC
Darle and others,
I have had no long term success with several methods of "waterproofing" servos.
Back to motor enclosures, see picture. I used a standard chrome plated sink drain sealed with a home made end cap. Motor shaft was connected to drive shaft with a universal joint and exits through a SubTech shaft seal. It has worked well.
Art
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Postby smwarships » Thu Jul 24, 2003 6:57 pm

Hi Art and Group ,
Well I have been working on this ideal and the only thing
left to do is the water testing .
WTMC's dual motors
The wall that the motors are mounted to is made with plastic
resin TC-808 , I made a mold of the 2 motors with an "O"
around the motor shafts , then made the motor mount wall .
The rest of my container is Lexan tube and plate .
Since these motors will be surrounded by water , the motors
should run cooler ....

What do you think of my little design ?

Darle

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Postby Scott T » Fri Jul 25, 2003 10:10 am

How about doing away with seals and adding magnetic coupling between the motor and prop shaft.
Here is a web site that has magnetic couplers.
magnetic assemblies

Another idea might be taking apart a garden pond pump and seeing how they couple the motor to the impeller for a leak free connection.

For accuating blow valves how about disassembling and using the solenoid part of a electric fluid valve. Or would this cause radio problems?
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Postby smwarships » Sun Jul 27, 2003 7:19 pm

Hello Group ,

Well I have run water test on my WTMC's and from the
test I have decided that the containers need to be made
of metal .
So I plan to make containers 5.5" diameter and 3.0" long ,
using brass sheet .030" thick .
The brass should conduct the motor heat and allow for
better cooling of the motors ...... ???

I have made 2 water control valves , one using a fuel
injector taken from a dodge van and a simple control
valve that allows one way control , both control valves
work fine .....

Darle

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Postby smwarships » Mon Jul 28, 2003 9:47 pm

Art Broder wrote:motor WTC
Darle and others,
I have had no long term success with several methods of "waterproofing" servos.
Back to motor enclosures, see picture. I used a standard chrome plated sink drain sealed with a home made end cap. Motor shaft was connected to drive shaft with a universal joint and exits through a SubTech shaft seal. It has worked well.
Art

Hi Art ,
Just wanted to ask you what is the diameter of that
chrome pipe your using as a water tight compartment
for your subs motor ??
Does the all metal housing cause any radio problems ??

Darle ???
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Postby Art Broder » Tue Jul 29, 2003 6:25 am

Darle,
It's a 2" O.D. pipe and is almost 6" long. It is a standard sink drain puchased from the plumbing department of Home Depot. There is no radio interference because the radio and antenna are in a separate Lexan WTC.
As you probably noticed, I use many parts designed for other uses in my subs.
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Postby smwarships » Tue Jul 29, 2003 3:14 pm

Hi Art ,
Thank you for the reply and information .
Someone told me that a metal container for the motors
could magnify the electrical interferrance from the motors
and cause radio reception problems , then I noticed that you
were using a sink drain without problems , so I thought that I
would ask the question .
Like you I try to use items made for other things in my subs.
Now to get the sink drain and make my containers .
2 of them side by side .....
Any other suggestions or ideals I should try out and use ??
What did you make the end plates out of for the motor
container ??

Darle :D
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