Is it normal it takes 3 torpedoes + sometimes a few dozen rounds of deck gun to sink a large tanker?

I thought i spread my torpedoes pretty well but those suckers still wont go down :haha:

P.S. thanks Chacal, will do

Three should do it
 

Make sure that the torpedoes are not set to run to shallow. Note, that in the early war, the torpedoes ran too deep due to a manufacturing defect, so in the early war if you set them to run deep, they will pass under the bow of the target.

Nothing worse to bring down than an empty tanker. Those things have double hulls and a ton of compartments and are nasty durable. They make up for it when they're full of av gas...:D