A 1:144 AKULA I with a insiad RCABS ballast tank

[type viic]

I've experimented with a piston

I've experimented with a piston using compressed air. It works, but something you need to bear in mind is the friction of the piston seal causes a bit of a delayed action, or in other words, the piston can carry on travelling along the bore for a little while after you stop the air pump.

This can make things a bit awkward if you're fine trimming. An alternative would be to try the same method, but use a bellows instead of a piston.

Yes, that will be happen, but that relative small of my RCABS ballaste tank, so the piston will carry on travelling no along after you stop the air pump

[Guest]

Have you treid a non

Have you treid a non pressurized tank sytem.
Very preciese control of the amount of water in and out and produces a hover with ease.

Two solinoids or crimp line and one oneway valve,baffles in the tank for slosh control on larger subs.Tank can be any size.
A windshield pump is used to pump water.This one can be made to run in the wet.
I am interested in your pump ,how much info?Specs?

Very simple system that works great,and cheap to make.

The above diagram shows how it is set up.When the pump empties the tank a vacume is formed in the WTC that is then vented at the serface and aids in sealing the WTC also vents out any dangerouse gasses from the batteries..Very scale like operation andis efficeint.
The Alfa uses an onboard aircompressor dive system I developed years ago and is great for large subs.
Also tried piston tanks and bladders work good to but was not good for my aplications.
Best Regards Dave amur Ship Yard

[type viic]

Have you treid a non

Have you treid a non pressurized tank sytem.
Very preciese control of the amount of water in and out and produces a hover with ease.

Two solinoids or crimp line and one oneway valve,baffles in the tank for slosh control on larger subs.Tank can be any size.
A windshield pump is used to pump water.This one can be made to run in the wet.
I am interested in your pump ,how much info?Specs?

Very simple system that works great,and cheap to make.

The above diagram shows how it is set up.When the pump empties the tank a vacume is formed in the WTC that is then vented at the serface and aids in sealing the WTC also vents out any dangerouse gasses from the batteries..Very scale like operation andis efficeint.
The Alfa uses an onboard aircompressor dive system I developed years ago and is great for large subs.
Also tried piston tanks and bladders work good to but was not good for my aplications.
Best Regards Dave amur Ship Yard

Sorry! That's too small to see your pictures and diagram, so I can't understand the structure of your said, please let me know more about that. Thanks!

If you are interested in our pump, please contact with MIKE CASWELL ]http://www.caswellplating.com/models/bhm.html[/url] Thanks!

I think our RCABS is optimum dive system for my sub, because my sub is
a very small size product, which only use a 2200mAh Li battery for power. our air pump be drive 370 class motor, and our Solenoid valve is baby-size one. So the air pump with Solenoid valve is electricity-saving. If use the water pump with water Solenoid valve, that will use up the power soon.

Lin