Discussion: What if?

[InvisibleDeath]

I have been watching UBoat historic documentaries and they raise this question which I'm raising as a discussion point here.

So in 1940 Norway was invaded and was protected by UBoats. The British Navy responded and entered the area of operations. It could have been a huge win for the German UBoat forces as they were easy pickings. However, not a single British ship was damaged because every single torpedo fired was a dud.

Now: in the beginning of the war, Karl Donitz (sorry, I have no Umlaut) requested two things: 300 uboats and a buttload of engineering work to make torpedos reliable. It was not until the late part of the war the Hitler realized his mistake in giving Donitz lip service. So what if Hitler had give Donitz what he wanted? What if he had 300 subs and reliable torpedoes?

For one, by the time the Norway invasion had occurred a year after attack on Poland, the Brittish could have experience a major loss for the British Navy which could have had a significant impact on the war, had the engineers resolved the trigger mechanism issues and there were few duds. A huge number of ships would have given the Germans a good attack force against the British simply by attacking war ships in large wolf packs.

So what do you chaps think the impacts would have been? Obviously it was inevitable that the Americans would enter the war. So what do you think would have been the effect on the war?