These are the only shots I have and they are from a while back. I was working on a mission I ultimately scrapped. While testing the mission I decided to have some fun. I surfaced, engaged the turbine, and ordered flank speed. Needless to say, they weren't happy to see me.
I hate to shamelessly plug my missions,
but if you want to take a Type XVIII for a spin without having to do the main campaign I did a few missions and a war patrol for the XVIII.
http://www.subsim.com/radioroom/showthread.php?t=135971