Well, the Isotope apparently is in the 1% of racing catamarans that do not have a rating (in either SCHRS or Texel). It is an active class, however, and has current ratings under the Portsmouth Yardstick. Lacking access to a measurer, and the time/inclination to wade through the measurement process myself, that leaves only Portsmouth.

All handicapping systems are inherently inaccurate, as it is impossible to reflect a boat's sailing characteristics in all conditions with a single number (regardless of how that number is generated). Nevertheless, I still enjoy handicap racing as well as one-design.

Regards,
Eric