Rolf,
Try updating the Java on your computer, that might solve your FireFox problem.

The Shearwaters aren't particularly fast, that's true, but they've been around a verrrry long time and have quite sophisticated rigs (there was at least one square top main in regular use back in the late '70s).

They had very slender wing masts with 3 sets of spreaders and airflow was critical. I notice that the more recent boats have masts more similar to the Tornado section. I should think that, being a development class, they've experimented with just about every combination of sail control and routing imaginable!

Interesting then that a lot of the 'top' boats still have a pretty 'standard' layout that is comparable to most modern cats. The Shearwaters even had curved tracks before the 'As' !