Sorry if this has already been cover but need some advise,
I'm having to rebuild my Ballast system as the airbag is larger enough to lift and can't fit any more foam in side to lift the submarine to the correct height.
My idea is to please two milk bottle ether side of the WTC, and pump the air into them to push the water out and and use the solenoid to release the air back into the WTC. the problem is I need a valve that has a ball inside the tube that then the bottle fill with water the ball will shut the tube to stop the water going into the WTC, do these exist or will I have to make them, also going to put on inside the tower so when the sub is surface any lost air is replaced in the WTC.
Trying to make it like the one from SAS WTC from the revel Gato build