would this be the rating you're looking for?


CODE 0-1 2-3 4 5-9

Nacra 5.2 Slp 2-up N5.2 72.1 78.0 74.8 71.6 67.4
Nacra 5.5 Slp 8.5' N5.5 67.0 73.5 69.5 65.7 61.2
Nacra 5.5 Uni 8.5' N5.5U 69.7 74.4 71.9 69.0 64.5
Nacra 5.7 2-up N5.7 72.6 75.5 74.8 72.2 68.6

from here

http://www.ussailing.org/portsmouth/tables08/tables08mh.asp