Design Displacement vs Construction Displacement

No worries, I think that we are all a bit susceptible to dyslexic moments - I often later find that I have said something very wrong or totally opposite to what I meant (and this is invariably after proof reading it a few times first).
Although Alan you could have quietly edited your post as an option (few would have noticed) rather than 'fessing up' re your increases and decreases

 

I read your original context as correct.

The crew is moving aft to minimize the possibility of pitch-poling

 

A question for Mr. Alan Gilbert.
About 25 years ago I built a Wianno 15, a S&S design.
Alan Gilbert was then Chief Engineer at S&S.
Was it you?
Regards,
Marco.

 

Alan's excellent summation is very clear and there is nothing I could add except to reinforce the idea that distribution of load is terribly important. I own a Mariner 19 CB 2+2, which is MORC certified. Of course, once one starts loading her for anything more than buoy racing, such as weekend camping, that certification as ocean worthy begins to lose meaning. If one pays attention to load distribution, her righting abilities can actually be improved, but, like Alan said, a stiffer boat, like a heavier boat, has more stationary momentum and therefore is harder on the rigging and everything that rigging is connected to. Sudden changes in strength or direction of wind have less give in the boat that is harder to move.

-Will (Dragonfly)

 

I'm sorry to have to disappoint you there. Cees van Tongeren still owns the company but he is the only one left. And, being well into his eighties, he is pretty much retired and has steered others with questions (who were referred to Cees on the Dutch forum zeilersforum.nl) to other naval architects.

 

As far as I know this used to be common practice. But I've noticed a tendency to communicate light craft displacement (m_LC as per ISO 8666) when communicating displacement in brochures and sailing magazines these days. Including reputable names like Hallberg Rassy, where one really has to dig into the manual to find figures for other load conditions, or Hanse Yachts (including the Dehler brand) for which I have not been able to find anything but m_LC from public sources about any models introduced over the past 2 decades.
I wouldn't be surprised this change of practice is for commercial reasons, as it tends to inflate figures like the SA/D ratio and reduces the D/L ratio, signalling a more "sporty" boat. Any thoughts?