F16 don't really fit within the F18 rules - the F16s are much lighter than the F18 minimum weight (about 100-110 kg compared to a 175kg minimum). The F18 rules also ban carbon in any form (I think they might disqualify you if you sail with a pencil in your pocket ) and some F16s use quite a lot of that!

George

Stealth www.peyc.org.uk