RE: [PSUBS-MAILIST] Hull Calc Spreadsheet

[Dewey Mason <bayan_darkeyes@yahoo.com>]

Hey Guys,
I am wondering why there seems to be such an VERY high
level of excess in every calculation and spec ya'll
build into your subs. The scientific arena does not
use so high a factor for a error margin. With good QC,
and high quality workmanship, a 100% margin should be
well above the likely point of failure. The USSR used
a much lower factor that this, and not one hull
failure has occurred (that anyone heard of, anyway).
It seems to me that an absurd error margin and
excessive layers of redundancy only up the final cost,
and slow the production of otherwise serviceable subs.
I DO belive in being safe, but also being sane. A sub
that has five layers of redundancy, and a safety
factor of three times calculated peramiters, and then
only sailed into waters no deeper than the operational
max, is a toy, or is wasting a huge amount of
potential.
I would not say anyone is WRONG in their choice of
safety features. I am simply asking, why SO MUCH usage
is being given up in the name of safety? In our
designs, we are currently looking at a one third
reduction of calculated max depth as operational, with
a test depth of ninety percent of max. We will need
the capacity for the work we will be doing. Also, what
factors do the various certification agencies use? The
insurance companies?
Just my thoughts on it, for what they are worth.
Dewey
T.D.P.F.



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