What need to unlock to build VIIB, C, C/41, C/42, E

[venom58]

Nice.Thanks m8

Edit:
not necessary to repeat the entire first post of this thread to say thank you

[andacio-1981]

Great job ! I really needed that Information ! Thanks mate!

[AlbertRoss]

Also for info:

T-III - level 10
T-V Zaunkönig I - level 15
T-IX Steinbutt - level 20
T-XI Zaunkönig II - level 25

AlbertRoss.

[Vlfgang]

What does A38 stand for, trying to unlock prop,Runnder & Engine. also B38?? Are these corridin? Unclear.
Which MODs are these that need to be completed?

[SubCruiser]

Hi Vlfgang,
at first: you have a question to thr rudder of the type VII A, isn't it?
The "A 38" stands for the rudder of the (VII) A, construction year 1938.
The "B 38/2" is the rudder of the improved type VII B and the "/2" means it's a twin rudder (better manoeuvrability) that fits in the type VII A, too.

A technology overview you also find on en.showiki.net ("unlocking technologies"), some more information is in the German version.