I managed to find this site which contains actual info about these 2 subs
Type VIIC
http://www.uboatarchive.net/Manual.htm
Type IXC
http://www.uboatarchive.net/DesignStudiesTypeIXC.htm
I managed to find this site which contains actual info about these 2 subs
Type VIIC
http://www.uboatarchive.net/Manual.htm
Type IXC
http://www.uboatarchive.net/DesignStudiesTypeIXC.htm
IX-C is nice