Mark,
I think there are a few additional rules in addition to only having a rating of 104. Also it is not really clear which handicap system they use to calculate this rating. It is not the NEW SCHRS system as that places a few boats out of the class I believe.
From memory the listing was :
Cirrus Evolution
Swell Spitfire
FX-extreme (Is not the same as FX-one)
Mattia Esse (is really not too competitive)
And they claim the AHPC Viper F16 as a F104 as well.
Wouter
Wouter,
I did a bit of digging around and I believe they will use SCHRS ratings 1.035 to 1.045 as being within the F104 umbrella. No doubt as soon as a boat they want to include comes along they will move this spread to suit their needs.