Any reason why the bladder bag couldn't be replaced in the above diagram with a rigid plastic ballast tank?
In my system I combine a cheap, practical, effective and easy way to have static dive capability in our RC subs.
Most (water) pump system compress air in a tank, which must be very strong, the pump intself must be stronger, not to mention the current drain. AND you need a valve. All of this is expensive and most modellers just try to buy the system because it is quite complicated to homebuild.
My theory was proved, because I designed it many years ago, and I just tested it now, I admit I feel proud and happy. My 1:144 trumpeter Seawolf will be in the shipyard soon!
As for the tube, well, in my first try (video below), using a 500cc bag, I glued the tube that comes with the W..40 spray, you know.
But the glue didn't work well with the plastic bag, so I came to this idea: a nylon 4mm wide screw, with a 0.5 mm (25.4 mm = 1 in.) hole through it, the screw, with an o-ring, is inserted in the bag, inside-out, protruding, another o-ring from the outside, a nut and a washer, the two o-rings provide the sealing. Attaching the screw to the bag was the difficult part.
A hose connected to the screw, then the screw and the hose are the air exhaust/intake. The water intake is simpler, a brass tube sealed to the bag intake, connected to the pump.
The wire should work, as long as you can effectively attach it to the bag. The bag (a picture included in this post) is made of polyethylene, or maybe Polypropylene, which are hard to glue to anything. Better a mechanical attachment, as mine.
http://www.rcuniverse.com/forum/m_78176 ... tm#7817619
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