If Mark's wanting it as an upgrade to the Albacore, the Ballast tank size is simply that of the previous system he had in play.
I'll need to get these boats assembled to have the best estimation as to what size I'll need.
Kilo will need a 3" diameter - but her tank size might need to be bigger than what you put the Albacore as she has higher reserve buoyancy.
For the Victoria class - I can fit a 3" and would like to, as it makes the tank shorter than a 2.5" regardless of the ballast required. But this leaves not much space above and below the SD, so a 2.5" might be a better bet. But again this little boat, very much like the Australian Collins has a high reserve buoyancy so I'll get these boats together and report in here with results when I have them.
Attached below is my grid exercise of the Victoria Class using Microsoft Excel
COG point is on the yellow line 54% of the distance from the propeller tip / 46% from the bow.
J
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