Hi Peter,
This explains some of the different systems.
https://www.gettingstartedinrc.com/rc-submarine-ballast-syst...

Martin.

https://www.gettingstartedinrc.com/rc-submarine-ballast-systems/

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Looking forward to seeing them when they are finished.
Well done.

Hi Doug,
Er .. No! Due to the cooling effect of the water it will actually contract, thus reducing the internal pressure. Venting air from the dive tank to the internal tube counteracts this effect.

Thank you Doug I stand corrected.

Martin.

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Peter,
This might help with your decision.

https://youtu.be/zU3EgLBFgow

Martin.

https://youtu.be/zU3EgLBFgow

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Hi Peter,
If you look at the sites that I have mentioned in my text below you will be able to see the systems and get a good idea of how you could make one.

Martin.

I am not sure Doug,
But do they have reversing switches.

Martin.

The old sock, is it port or starboard ?

Martin.

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Hi Guys,
In the thread (motor reversing) we drifted on to the subject of Submarine Watertight Compartments.

Well I am by no means an expert on this subject but I have been following with interest.

Please correct me if I am wrong.

At the depth that most model submariners use there subs is normally at periscope depth or just under especially when the water is not clear.
In a swimming pool then the submarine will be used at much deeper depths.
There are a lot if different WTC's on the market today each having different ways of securing end caps and different ways of ballasting.
Each design has it good and bad points, therefore when considering what system to purchase or make you should consider how you will be using your submarine.

All model submarines will reach the bottom if you don't stop them, and as model submarines are not cheap then why would you risk losing sight of it.

Now this bit is the tricky bit.
The pressures that most model submarines would normally come across are not that great but are greater if using it in a swimming pool.
From what I can see the conversation on wall thickness,depth,and pressure seems to be more on the side of belt and braces.
Obviously the deeper you go the higher the pressure, the air inside the compartment will expand.
Depending on the system that you choose the air pressure inside the tube could increase as the ballast tank is filled forcing the air in to the electrical sections.
Other systems vent the air from the ballast tank and do not increase the pressure inside the tube.

As I have said I am not an expert so please feel free to call me an idiot or something.

As I am sure that we try to over engineer things just to be on the safe side.

Martin.

It would be a total nightmare if they used submarines.
That game could go on for a very long time.

Martin.

Hi Graham,
Well that's what it is all about.
After watching the build and then seeing her completely finished and actually on the water is a really nice thing.
You must be really pleased and proud.
Excellent work well done.

Martin.

I agree Doug.
Sorry to hear about your grill, but looking at your avatar you will need to get a BIG grill. LOL!!

Martin.

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My own 'To Do' list gets smaller but the one my wife writes definitely gets longer LOL!

Martin.

Hi Nerys,
If you go to Doug's profile page there is a tab for private messages.

Martin.

Doug,
I have just seen this.
2.4g.
Expensive!

Martin.

A ship in a bottle would not take up much space.

Martin.

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Hi Guys,
This is the sort of system that I have been trying to explain.
The photo is a snippet from the internet.
Although it said that cannot dive stationary, well that depends on how the submarine
Is weighted and ballasted.
Peter,
If you type in on your web browser " model submarine dive systems " you will find a lot of information, also on utube look for Bob Martin (rc sub guy) his videos are very interesting.

Martin.

I am working on something that is definitely unusual and will be a bit of a talking point.

Martin.

Certainly something to think about Doug.

Martin.

Thank you for the offer it is much appreciated but I am not really a sub guy.
I just tinker to see if I can do things.
Thanks again.

Martin.

My tube is exactly the same as yours Peter.

Martin.

Hi Peter,
When the Gato submarine is ballasted correctly you will be surprised just how little water is required to start to submerge it.
I used standard servos as that was all I had,but if you use the 9g small servos you will end up with a lot more room and it will be lighter so you will require more ballast.

Martin.

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Hi Ken,
I am glad that you had a great time.
And I love the socks.

Martin.

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Looking good JB,
Really looking forward to seeing the end result.
Keep up the good work.

Martin.

A very very nice collection.
Well done.

Martin.

Hi JB,
Thank you for your generous offer but I cannot accept.
I really do appreciate it.
I still have quite a lot of bits and pieces to use up.

Thanks again.

Martin.

Interesting how does that work. ?
How is it fitted in the submarine. ?

Martin.

Good job that it wasn't winter.

I have been thinking again! No not again I hear you say.
Well I have been toying with the idea of fitting a reel of fine fishing line inside HMS Cottesmore and having a deck fitting that will float if the worst should happen.
At least I would know where she is lying on the bottom.

Martin.

I must admit I have never had any problems with any shafts, having said that the chances of my boats hitting the water now are over for me.
However when I make my models I always grease them up just in case I end up selling them.

Once I have used up all my bits and pieces, odds and ends I will still make models for RC and test all the movements to make sure they do what they are supposed to do.

Martin.

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Well Doug it was a bit of entertainment for your fellow members.

Martin.

Eventually when I am completely happy with the way it all works I will fit a few small retaining screws in the end caps.
She is trimmed both in surface trim and submerged trim using lead weights and close cell foam.
At the moment when I flood the tank she submerges fairly evenly.
But it is all experiments at the moment.

Martin.