At the moment i'm near 600 000 tonnes already and i'm in march 1941
I play very aggressive and i search for convoys.
even the destroyers look confused to my actions.
I sail straight ahead at full speed submerged then dive to 20 meters under a merchant then immediately back to 13 meters and fire some more torps
it gives me just enough time to fire at least one and sometimes 2.
And that gives me probably 15 000 extra tonnes.
However the happy times are over now so it's getting more difficult for me now and the merchants are armed now.
I'm saving enough renown now to buy a type XXI
i'm back at 7200 now after purchasing the type IXb
i still got enough time to get to the 21 000 i guess ?
with a small calculation i can see 1000 renown for each month so that gives me only for 1941 9000 renown left.
At least.
And then its still 2 more hard years and longer so i guess i will surely get my top sub. and still be able to improve my type IX
My crew is extremely experienced now