Hi Derek,
yes its the same one.
from all the replys from my other post it seems that I need to keep weight [a] central and low .
to this I'm hoping to put the batteries flat in the engine room, just forard of the centre of the hull, with the free flooding tank aft of that.
the pumped ballast tanks then go forard of the engine room, and aft of the free flooding tank.
I guess what I was asking, though not too clearly, was whether the fixed ballast would be more stable spread across the bottom of the hull, or down the centre.
from your 3a and 4b it would seem that for the best stability it should be across the whole width of the ship, although this may produce dramatic bow scenes as it heads through the waves !!
the hull I'm building now is basically being used as a learning project, and for trying out ideas, and now I have received the plans from the shipping company, and got them scaled, I can begin to plan how to build the proper model, using the experience gained from this first hull.
anyway, must start clearing up and getting ready to get off home, so thanks for your comments, and I'll see what happens when I finally get the beast into the water [SWMBO keeps coming up with other things to take up my time !]
cheers
alan