I'm posting here on behalf a of a friend who is having issues with the darnell t class submarine. He is not a stranger to model submarines or boating but this issue has him in a pickle. The issue is his submarine keeps rolling over, more so when he turns. He says that the Centre of buoyancy and centre of balance are correct and therefore is rather bemused by the problem.
Does anyone have advice I can pass on to him, Anything would be helpful at this stage.