I couldn't get to periscope depth when playing yesterday, I modified some values in the . sim, uploading new revised version 2.3 as I write.
It obviously didn't like that the surface weight was 1720 and submerged 2300, too much of a difference I guess, so I lowered it to 2000, and it went to periscope depth when ordered so.
I also checked the range and speed both surfaced and submerged (see above post for data) so it would be historically accurate.
Keltos
link :
http://files.filefront.com/v+23+IJN+.../fileinfo.html