In article , DSK
wrote:

A technologist would express a 'blue water' boat as designed with all
critical components specified with a safety factor of 4 or more; a
coastal boat @ 3, a 'production' coastal boat @ 2.

What I mean by safety factor is the deduction of stress imparted to a
structure such as having a stainless steel component with 90,000 psi
ultimate properties and designing the *function* at 22,500 psi applied
stress ..... for a safety factor of 4. If you discuss such with the
reknown designers of 'blue water' boats they will relate that they do
design with such a 4X safety factor, more if the boat is going to the
'high latitudes'. They will also give you a lighterweight coastal
design of the exact same size, shape & configuration but at SF of 3, or
you can buy a 'production' boat that sometimes approaches SF of 2.