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Brent, While you can disclaim the need for a weight & balance
calculation (does not have to be “professional” and is actually
pretty simple…just requires a little discipline) every naval architecture
and submarine design book that is worthwhile starts the design spiral. First define
your requirements, next compose an initial layout sketch, then start your
weight & balance calculations, and then rough stability calculations…at
any point along the way the numbers do not look right, you go back to the start
and refine your spiral until you have a stable design. While there are submersibles
that have operated without these, there are a lot more sitting as rusting lawn
ornaments…the Needlefish is an expensive example. We have an
obligation as PSUBers to promote safe designs and safe design practices, any
other avenue is negligent. This doesn’t mean that we can’t
daydream or explore innovative ideas but we must carefully label these as
unproven and/or dangerous so the neophyte doesn’t go down the wrong
avenue and the experts don’t label us as cranks. The Biber design was a proven death trap and this is why
the Nazis moved on to the Seehunde design which was better but still
deadly to its operators. The Seehunde was still in the experimental
stage when it was deployed as a weapon and the operators recognized missions as
being suicidal. New submarine service awards were developed to recognize
K-verbände members who had completed only one mission…no one ever
survived to receive the gold-level award. 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 Brent
Hartwig Greetings
Joe, Cheers, From: joeperkel@hotmail.com
Jens, This
is Jay not Ray. J When dealing
with a small submersible there are a lot of constraints to design due to the
size. While it is interesting to build a historical look-a-like, we
should strive to follow modern conventions for the sake of safety. Any
vessel that is used for war has a greater inherent risk of disaster and small
submersibles were generally considered one way missions…these risks are
accepted as part of the design objectives. In our case since we are not
dealing with a war vessel and start from a different set of design objectives
that should place safety paramount, we will make many different design
decisions than those found in the Seehunde. In other words, we
would be better to start from ground zero in design of a PSUB. Joe
Perkel looked at designing replica NR-1 and Alvin look-a-likes
upon a K-350 hull. He retired from this effort for other reasons
but found many constraints and would have found more once he became involved
with weight and balance along with stability calculations. Thanks
for the reference, found a copy that I will purchase next payday to add to my
large library on submarines. R/Jay Respectfully, Jay
K. Jeffries Andros
Is., Bahamas Talk
sense to a fool and he calls you foolish.
- Euripides (484 BC - 406 BC) -----Original
Message----- Ray... Good
to hear you say this... :) Are
you familiar with the book "Die Seehunde - Klein-U-Boote, Letzte deutsche
Initiative im Seekrieg 1939-1945" by Klaus Mattes; Verlag E.S. Mittler
& Sohn GmbH, 1995, ISBN 3-8702-0484-7, 224 pages. The
book presents a thouroughly presentation of the Seehunde design, complete
with excellent documentation in the form of technical data, images,
sketches, drawings, etc., etc. In
addition it has a big section covering the various operational aspects of
the type, and finally it also has an interesting coverage of what the french
navy used it for after the war was over (up to the mid-50s). regards, Jens **
Jens, ** **
Thanks for the great image of Biber, I have Lakowski's book someplace and **
will have to dig it out for review. Instead of building a Biber **
look-a-like, consideration might be given to the Seehunde as it was a more **
stable vessel (relatively). ** **
R/Jay ************************************************************************ ************************************************************************ ************************************************************************ The
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