A small cat, maybe. I recall a maxi-cat sailing at 44 knots once. It is hard to imagine that they would try anything in a 500 meter course, but Orange, Geronimo and the like are conceived to sail very close to the record, with equipment, crew and food on board.

The bottom line is that specially conceived craft may increase speed merely increasing size (and price) but windsurfers can not. As a consequence, windsurfers are very close to their limits, while specially conceived craft and maxi multihulls may continue to develop, if not improving the technology, merely increasing size.

One example: if someone decided to build a conventional maxi proa with the same length and technology of today's maxi cats, it will almost certinly beat the outright record. Money is the limitation.

Cheers,
Luiz