To Jeff H Why roly motion? As you very well know there are different types of motion behavior depending on the design.
When you talk about traditional designs, its hard to avoid large roll angles. The comparatively high vertical centers of gravity and low centers of buoyancy meant that there was comparatively little dampening, and the heavy spars meant that there were large roll moments of inertia carried up high creating the likelihood of excitation rolling.
There is no such thing as a good, hobby-horsing motion. Most of today’s boats fall under motion category stress and diabetes. I believe that we were talking FLD Family cruiser for long distances.
It sounds like we agree that there is no such thing as good hobby-horsing. I don't know what the sentence about modern boatss falling in a category of stress and diabetes. Its not really English. But within the realm of moderately conservative modern design, the have been huge advances in addressing motion comfort, boats which roll and pitch at slower rates and through smaller roll angles than more traditional designs, which is not to say that there aren't also stripped out race boats and more agressive designs with less comfortable motions. These more conservative modern designs work well as family cruisers.
To Jeff H They come closer to reflecting out of date dogma rather than reflecting the science behind yacht design. Sorry to have to tell you that the science of today’s only reflect the racing rules. Has it ever occurred to you that actually were a Fastnet race tragedy?
I am very familiar with the lessons of the Fastnet Tragedy and the huge advances in scientific understanding which has occurred in the 34 years since. While race boats tend to reflect the racing rules, and there are aspects of cruising designs that are derived from the lessons learned from race boats, for the most part the design of modern boats largely reflect the lessons learned from the Fastnet and the scientific studies which followed. These newer boats are safer, easier to handle, often have more comfortable motions and are faster than anything which came before. You should try to learn about the science behind the better of these designs, and spend time sailing boats of a variety of periods before condemning them.
To Jeff H The Vikings designed that type a long time ago, and they were good for real speed.
The Viking ships were amazing technology for the bronze age. They were ingenious and fast for their time. But they required large crews to operate, went missing routinely, and took enormous skill and strength to sail. They were dog slow in most conditions compared to modern designs, had limited up wind capabilities, and would be very limited as a family cruiser. The bronze age was a long time ago and a lot has happened since....