Hi all, im new to this sub bit

I got the Ohio that was for sale on here, had a few problems with it

but most are sorted now
Just a few questions, How much water should go into the ballast tank? I have tryed the sealed unit in the bath and it kinda pumps in so much ( im guessin once the unit is in the sub you wouldnt take alot of ballast to sink the model? ) My other question is the outlet valve? umm

havnt a clue lol anyone know how it works? i cant work out if the tube gos through the plastic thing and that the servo pushs the thing into the tube and shuts it off? or by turnin the servo it releases the presh?

If any of that makes sense any help would be greatful

as i really dont want it to sink lol
Thanks
Daniel
edit: i forgot* the pic
