The highest speed I have known the Tornado to go was at CORK '75.
A 40kn storm hit, when the the fleet got to the reaching leg.
The peak of the storm must have hit, when the leaders got to
the jibe mark. At this mark a couple boats broke their side stays,
one of them was Reg White who released the other stays, so as not
to damage the boat from the mast.
Notary was there on "Salt Water Wine", Zutec on "Twister" & Smyth.
Anyway a Canadian destroyer radared the fleet at 28kn average.
That's 33mph average, at that speed the hulls were no longer in
the water it went like a skipping stone from crest to crest in a 9'(3m) chop.
It was amazing the Tornado could skip the crests, and soar over the troughs.
It was sheer madness, with some poet license here, it seemed like
we zoomed over 5 crests in ten seconds, and the wind would
calm down to 2 or 3 crests in 10 seconds a la bucking bronco,
and then accelerate again.
I will never forget the thrill, not to mention wondering will
the wind ever slow up. I recall a Tornado to windward of us,
and counting it cartwheeling/rotating about it's mast 3 1/2 times, and
the crew later righted the boat unassisted, no air tight masts then.
Anyway, I would call it somewhere between sailing/flying & oh ____.
So with a broader wave/wind angle, and a huge offshore swell with
a kite to keep the bows up, 33kn seems possible in the Carribean or Oz.

Great wind & waves,
Chris