I think you have looked at the wrong table for modifications to Portsmouth numbers. The
Multihull modifications table shows 0.96 if a spin is fitted to a boat not normally equipped with one and 1.02 if a spinnaker boat is sailed without spin. That implies less of a penalty fitting a spin than taking one off (the reciprocal of 0.96 is 1.04). I think you looked at the
table for mono-slugs The base number of the FX-1 w/spi is 69.2. Correcting for no spin (multiply by 1.02) gives 70.584. The
2004 Multihull tables show the Hobie FX-One 1-up no spi as [71.2] - the square brackets indicate less than 5 data points submitted.
Page 19 of the
hobie class rules sure reads like the FX-one is a spinnaker class boat...
I think the spinnaker on cats was one more nail in the coffin for cat sailing.
Have to disagree with you there. Spinnakers make sailing downwind fun. Pretty much all the newbies in our local group are on non-spin boats, and as soon as they get a ride on spin boats they all want one
Chris.
