I still have the old dynamic diver I built years ago. I never completed the next experiment with that sub which was to install a pendelum (in the free flood area) linked to the rear planes to try to devise a method of automatic leveling. Back in early 80s when I was trying this sub I found that this was a problem - the difficulty of achieving level running without porpoising. The pendelum would sense the pitch of the hull and correct the rear planes for zero bubble. I built lots of adjustment into the system to get the feed-back of the pendelum just right. But I never completed that experiment and the sub sits on a shelf in the garage. The sub is 42" long and looks like a generic guppy type with the tall sail. it should be retired and become a symbol of my first try, but I thought at times to get it running again. Most of my experience is with wood so I wish to get some experience with molding simple sub hulls (Permit type perhaps) with fiberglass and epoxy resin. A proper WTC is in progress for a more state-of-the-art sub.
By the way, something has come up that may prevent me from being in your chat room on Friday night, but if so I will attend two weeks from Friday.
Take Care and Have FUN