Steelboats

[Gisborne]

Dead wrong , from the outset., I start with a set of hull lines, with all calculations done in the usual way. ..........

But you never had lines, the only set of lines was produced recently, quite publicaly and certainly not by you. It was the total lack of lines that proved you had no concept of how stability is derived and you still don't. You don't even have a clue what a weights study is, and have no idea of where the center of gravity is. You have never produced a GZ curve, all you have are those produced recently by others.

 

[Gisborne]

Tads proposed test is for initial stability, nothing do with ultimate stability. ................
That is initial stability . One of my 36 footers was in Tads back yard, Degnen Bay, the whole time that debate went on.............

Again you have no concept whatsoever. Why don't you simply read a boat design book, then you might stop making totally ignorant comments about stability estimate and verification.
Tad asked you to arrange a boat, that was your call, and still is. I don't think you really want to know your boats stability. After claiming close to 180 degree's for decades from your supposed design studies, you revised that down to what 165 degrees ? And that only after Tad did a real study, and produced a set of lines and determined a rough Center of gravity.

Tad says your AVS is 131 degrees.

 

[john_morris_uk]

Tads proposed test is for initial stability, nothing do with ultimate stability. Step on the rail, and measure how many inches it heels, compared to similar boats. 2 inches for my 36.
That is initial stability . One of my 36 footers was in Tads back yard, Degnen Bay, the whole time that debate went on.
More beam gives you more initial stability, at the cost of ultimate stability as does lower free board. They are in many ways, opposites.
The buoyancy in my wheelhouse 3500 lbs is the equivalent of adding that much more balast

I’d like to think that the strange terminology used (it doesn’t match the normal terms used when discussing static or form stability) is just an affectation. Sadly as even the most basic knowledge of form stability shows, Brent is spouting a high proportion of garbage yet again. Form stability comes from the canoe body shape as well as beam.

It’s also apparent that Brent chooses to ignore the higher maths necessary to calculate Hull strength derived from the complex shapes he derives from origami design and construction and dismisses questions by pointing to tales of bouncing off reefs etc.

Unfortunately for Brent I’ve sailed across Oceans in Steel and GRP boats so he can’t dismiss my questions with his usual bluster that I speak from ignorance and no experience.

 

[Gisborne]

I’d like to think that the strange terminology used (it doesn’t match the normal terms used when discussing static or form stability) is just an affectation. Sadly as even the most basic knowledge of form stability shows, Brent is spouting a high proportion of garbage yet again......

Brent has never even understood stability, nor much anything to do with applied materials science, he's spent most of his life eschewing anything that hints of a rigorous design process. Instead he's refined a whole raft of deceptive tales of his boats exploits, they bear scant resemblance to actual reality.

He never tells any prospective client that the design which rounded the horn was rolled 3 times. Nor does he say anything about the boats that just came off their moorings and were written off, or the exceptionally big dents in his boats from relatively benign groundings, or drying out over a rock. Nor would he mention the boat that tore it's welds in a grounding and was only saved from sinking by the coast guard.

Even the origami boats that Brent uses as examples were ironically not built nor designed by him but by Evan Shaler. Evan uses the same Hull-form and then puts in a lot of the structure Brent claims is not necessary. Brent then rather ironically claims those craft as validation of his great design skills. Even the home builders don't build to Brent's design but on Origami community advice put extra framing in.

On BD net net he really was revealed as not only a backyard designer but he's also a hack designer. His earlier designs were very much trial and error, adding structure as weakness became apparent, such as keels rotating into the hull on grounding.