The IYRU also incorporated a B2 class, which was 18' LOA, 8' beam and 200 sqft of sail(s), sailed two up, two on trapeze . A very popular class in Australia for many years with several very successful designs of which the longest lived and still class sailing in good numbers today is the "Stingray"(it was also a contender in the sail off for the first Olympic representative from catamarans). although the Stingray has some years ago raised the height of their masts and increased their sail area from the original B2 class measurements.