Keel Rudder Torpedo Hit

Hello all Kaleuns

I have got a little question here.Yesterday my Type VIIB U-47 torpedoed a zig zagging British tramp steamer west of Orkneys.Wonderfully,I achieved two torpedo hits into the keel rudder of a steamer,all in a row.Steamer sunk.

It's has always been quite difficult for me to hit a keel rudder of any ship.Usually,torpedo bumps into the rudder and goes away without detonation,no matter what kind of pistol and route depth is set.I was very amazed this time.

So,what was that - a hit into the vulnerable spot of the keel rudder or just an accident?I am confused.Have anybody seen anything like that?

I would be glad to read all your observations.

Good Hunting