Hanging laundry... good idea !
It is a tad ... uhh underpowered but its a lot more realistic and more or less reflects what happend in real ops.
That being said it does help some where you aim and what type of ammo you use. AP right at the waterline, HE on the superstructures helps a bit.
Your still going to take quite some time to sink anything.
Why are you wasting ammo on a tug boat anyhow :hmm: