|WikiProject Ships||(Rated Start-class)|
So, what's it do ?
It'd be nice if the article said what their use is, and in the introduction too. Reading on, as concerns submarines, it is explained satisfactorily enough, but as concerns boats, all i now know is that they hold water. I suppose that it is to give a load to an otherwise empty boat ? But then, how does that help her navigate over shoals in rivers ? --Jerome Potts (talk) 23:59, 29 September 2010 (UTC)
I do not think a citation is needed over the comment that ballasting to increase draft may be necessary in order to cover the propeller with water. Anyone who has been past a ship with its screw significantly exposed due to unloading will see the necessity of this. Tony Wallace — Preceding unsigned comment added by 126.96.36.199 (talk) 01:47, 31 May 2011 (UTC)