Rokket, NZ
Morning, well c/41 got an enlarged wintergarden, main gun removed,
lenght pressure hull: VIIC 20,5mm ----- 28 of C/41
a surface area : 758m3 ------ 999m3
main gun removed but artillery upgraded from 1x 2 cm flak + 2x 2 flak + 1x 4 flak...
i think that NZ is right writing "they were difficult to trim", even if they had same underwater speed (better propulsion) and a little faster speed when surface mode.
Here some new pics, have fun: