Cutting a destroyer in half...

[IanC]

Originally Posted by Lt.Fillipidis

In two parts. Not bow and stern but port and starboard!
During an attack on a convoy i misclicked the "Blow Ballast" button just before a destroyer came above me. Eventually, while my nose was 2-3m below the surface and rising. The destroyer was in complete allignment with my boat and my bow started scratching the keel of the destroyer.
Needless to say, the destroyer sank completelly within seconds.

Now the question is: Is that realistic?

No it's not realistic lol...
I think it's a known SH3 bug that we can sink ships by ramming (or is it in sh4?).

[Lt.Fillipidis]

@GR
It didnt rammed me actually, i rammed it. The nose dragging started at about 1/4 of the DDs length and kept up until the DD started turning. Thats more of 2/3 of the total length of it.

PS I think the DD was a Black Swan class and my boat is IXB

Edit: I remember seeing a hollywood movie about a submarine that cut ships apart like a chainsaw. It also had that spiky thing that german uboats have

[GoldenRivet]

Originally Posted by Lt.Fillipidis

@GR
It didnt rammed me actually, i rammed it. The nose dragging started at about 1/4 of the DDs length and kept up until the DD started turning. Thats more of 2/3 of the total length of it.

PS I think the DD was a Black Swan class and my boat is IXB

Edit: I remember seeing a hollywood movie about a submarine that cut ships apart like a chainsaw. It also had that spiky thing that german uboats have

that spikey thing is a "net cutter" if memory serves.

it was also more or less useless if memory serves again

the movie you are referring to is probably Jules Vernes , the submarine in question was the quite fictional and quite heavily armored with iron and steel "Nautilus" which was in fact slicing through slow moving wooden sailing ships while the sub itself was traveling at high speed.

any German U-boat foolish enough to ram it's target would have probably been a total loss as they were actually quite sensitive to those types of impacts... a number of u-boats were severely damaged or completely lost due to collision with even small merchants.

U-505 was even stuck in repairs for several days because it brushed a jetty or pier of some sort - the minor damage sustained in the low speed collision rendered it completely unable to dive.

[Jimbuna]

Originally Posted by GoldenRivet

quite unrealistic i should think.

i think in real life, the DD would have likely suffered some damage... perhaps even moderate damage and manageable flooding.

however in the process it would have sliced through your U-boat like chainsaw through a stick of warm butter.

You're boat would have probably been so severely damaged that it would need to be abandoned... or it would have simply sunk altogether.

think of the mass and inertia.

assuming the DD was lining up for a Depth Charge run, he would have been moving about 2500 tons at speeds upwards of 30+ knots.

that would have completely steam rolled over the 800(ish) ton U-boat which was probably moving at 4 knots or less.

the effect this would have had on your boat would have been catastrophic and irrecoverable to say the least.

i would estimate roughly - that perhaps 10-20% of your crew would have been killed in the immediate collision, about that percentage again would have suffered serious injuries some of which would have rendered many of them more or less useless for activity of any sort.

the boat... much of the conning tower would have likely been crushed causing immediate flooding in the control room at a rate of several thousand gallons per minute.

such damage probably would have been almost universal from the conning tower forward.

the aft compartments probably would have emerged mostly unscathed.

the boat would pretty much be a total loss.

Delete the word "quite" at the beginning and insert the word "totally" and I fully agree.

There are numerous instances where escorts rammed U-boats and received damage as a result meaning they had to head to port for repairs....one even got its propellor shafts entangled in the U-boat rigging/rails, but very few if any ever came off worse.

Originally Posted by GoldenRivet

that spikey thing is a "net cutter" if memory serves.

it was also more or less useless if memory serves again

the movie you are referring to is probably Jules Vernes , the submarine in question was the quite fictional and quite heavily armored with iron and steel "Nautilus" which was in fact slicing through slow moving wooden sailing ships while the sub itself was traveling at high speed.

any German U-boat foolish enough to ram it's target would have probably been a total loss as they were actually quite sensitive to those types of impacts... a number of u-boats were severely damaged or completely lost due to collision with even small merchants.

U-505 was even stuck in repairs for several days because it brushed a jetty or pier of some sort - the minor damage sustained in the low speed collision rendered it completely unable to dive.

Agreement x2

The outer hull was little protection for the pressure hull....any hole or crack etc meant the U-boat was no longer able to submerge and the escort skippers and kaleuns were very well aware of the potential consequences of ramming/collision...hence the eagerness for escorts to ram at almost every opportunity.

[Sailor Steve]

Originally Posted by GoldenRivet

U-505 was even stuck in repairs for several days because it brushed a jetty or pier of some sort - the minor damage sustained in the low speed collision rendered it completely unable to dive.

I never thought of that before, but it actually makes perfect sense. The pressure hull of a submarine is several times thicker than the hull of a destroyer. The DD's hull is 1/4" (about 6mm) of mild standard steel. The pressure hull of a u-boat was about .85" (20 mm) of hardened tensile steel. This makes it sound like the u-boat would be much stronger, and for submerging - and surfacing again - it is. But what happens when your car gets into even the slightest bump? The hood gets sprung. The doors get sprung. So what happens when the u-boat hits or gets hit by another ship, especially one weighing between two and four times as much? The pressure hull might not get hurt at all, but if it flexes even a little, the torpedo doors get sprung. The hatches get sprung. And those torpedo doors are underwater all the time.

Glug.

[GoldenRivet]

@Steve

i think it turned out to be a damaged dive plane that barely brushed against a dock or jetty of some sort, ultimately this jammed the bow planes.

[Iranon]

The damage model is a little wonky at times. If a destroyer drives over you while you have your scope up, you usually lose it. However, this is a non-neglegible chance you will sink the destroyer by cutting it open from bow to stern WITH YOUR FRIGGING PERISCOPE.

[Lt.Fillipidis]

So if the steel used for uboats was a bit more flexible, the uboats could ram a fishing trawler at least!

Same with modern uboats?

[IanC]

Originally Posted by IanC

I think it's a known SH3 bug that we can sink ships by ramming (or is it in sh4?).

Ok scratch that. A quick google search told me that the 'destroyers being sunk after ramming you' bug has been fixed with patch 1.4b (they increased hull strengh).
But reading the OP, maybe they should beef up the hull a little more, or weaken the U-boat.