If this is your first submarine kit I would strongly recommend that you stay with the kit batteries. You can fit anything you want but reballasting a sub if you have never done it before takes a bit of getting your head around.
A ship has to sit in the water at the correct attitude and be stable, which is a function of the difference between the centre of bouyancy and the centre of gravity. That is pretty straightforward, all you need is a bath and some weights.
A sub has to have this trim and stability at whatever depth it is at, so ballasting when on the surface may not match the requirements when submerged. Get it wrong at depth and the boat may change trim and end up surfacing or, worse, diving. I am not saying it is too difficult but to prevent unecessary headaches I would suggest you fit the Robbe batteries for now and experiment at a later date when you have gained experience and confidence.
Coming along nicely though, I look forward to the sea trials! Don't forget there are only two types of water craft, Submarines and targets!! |