TypeVIIC and Robse,
Gents- I was away for a few days and just found out you were lost on my MSN Groups site. If you saw the pictures, you were at the site. At the site, in the column at your left, with the light blue background, you will see 4 choices. Click on "Documents". Then click on my Woods Hole 2003 video at the bottom of the new list. There are a few pictures, at the beginning of the video, of the 'Remus", a research sub with an on-board computer, and then you should see my Alfa running in the tow tank.
If you have a media player you should be able to view the videos.
There is also a short video, with the hull opened up, showing the ballast bladder inflating and deflating. That is the choice just above the bottom Woods Hole choice.
If you have any more problems with the site, let me know.
RCABS- It's easy to control your own bladder!