How does one attack a zig-zagging convoy?

[Silavite]

Originally Posted by Red Devil

Also DD's move artificially fast in acceleration, they don't move all THAT fast in reality. 0-60 in 5 seconds, I doubt it

They're pretty nippy.
A Minekaze-Class Destroyer has 38,500 horsepower and 1,400 tons displacement if I remember correctly. A Balao-Class Submarine has 5,400 horsepower and weighs 1,500 tons (surfaced, running on diesels).