Surviving 16 days pounding in up to 12 ft surf on a Baja lee shore, pounding across 300 yards of Fijian coral reef, T-boning a steel barge at hull speed, colliding with a freighter in Gibraltar, decades of ocean cruising in all conditions, without a single structural failure at sea, and a single season passage thru the NW passage, all with no structural damage whatever, is far more accurate that any calculations you could ever come up with.
Yet some of the above claims have been refuted over and over in this thread - as an example the so called T-boning incident. And many of the brentboats have had framing added to give them more strength - seems their owners didn't think that they were strong enough. Looks like your guesstimates weren't good enough for them.
Yet those who claim that such boats are not structurally strong enough , buy and cruise in boats which would have broken up in minutes in the same conditions, proving that they are definitely not the sharpest tools in the shed!
Fiberglass boats have done the NW passage, and made thousands of ocean voyages with no incident. What I cannot figure out is why do brentboat owners run their boats into reefs, etc so often? If you compare the number of brentboats to the number of collisions, groundings, etc, it seems like there is a real problem with them.
Perhaps it is time you gave NASA a call, and informed them that they can get rid of their wind tunnels and structural testing to destruction, as your computer is more accurate.
Which has nothing to do with your lack of knowledge of the structural properties of materials or structural design.
The stability curve of my boats is posted on the origami boats site. Have someone who can read English, interpret the last sentence for you.
Just because someone did a hack job at guessing the stability of a brentboat doesn't mean that you have the ability to do a real stability calculation (and understand what you are doing).
I was going through a boatyard today, when someone I was with mentioned to me that a nearby steel sailboat had been recently surveyed - the surveyor put his finger through the hull where it had rusted through.