The official feeder class is the BIC; which is great because it can either feed in to RS:X or FW essentially. In AUS we also kind of use the RS:X class as a feeder also as most of our RS:X fleet comes to the formula nationals and just chucks their 9.5 on a FW (and do quite well) - including our Olympians! Often the guys who don't continue on with RS:X after the trials but still want to race get involved with FW.
For sure its "quite technical", but certainly that is the appeal?
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