RE: [PSUBS-MAILIST] one more design consideration

You have to be careful of asymmetrical fin surfaces if you are going to operate at speed. They cause a snap roll effect to the outside in the direction of the hull they are on. The US Navy would like to get rid of conning towers because of this effect. The need to stow masts and have a safe position above seas to operate the boat from on the surface has precluded this change. There is a great SNAME paper from the mid 80s that describes the snap roll issue. Depending on what speed you expect to go in an ambient, this shouldn’t be an issue.

R/Jay

Respectfully,

Jay K. Jeffries

Andros Is., Bahamas

Talk sense to a fool and he calls you foolish.

- Euripides (484 BC - 406 BC)

From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of David Bartsch
Sent: Friday, August 29, 2008 12:41 AM
To: personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] one more design concideration

   Yes, I have decided that due to my finacial situation as well as a need to get my feet wet sooner, you can count me among those attempting an ambient boat. A submarine is still a submarine!

   One thing I concidered, is that instead of a two section rudder as in the case of tear drop hull type submarines, I go with a rudder that simply uses only a lower assembly, when conducting high speed turns, the boat should have its back end kick out in the opposite dirrection and cause the boat to lean into the turn such as an airplane...seemingly flying into turns...

   I was on a "boomer" boat that as a submarines goes was slow and awkward...I just want to feel more in control such as a fast attack sailor.

                                                                                          David Bartsch

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