unless things have changed the US I-20 does not conform to the F-20 class rules....with a carbon mast and a slighty larger main.check out the F-20 forum..
Maybe a better question is: Who is the governing authority for F20 class in the US. ISAF does not have an F20 class (site search) however us sailing has a P# for F20 that is the same as the I20.
