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windsufering said..
This is where it gets confusing you can have two sailors with the same size rig and fin sailing in different divisions at the the same regatta in the same conditions
There are 2 classes,Techno and Techno plus.
Techno plus has 7.8 and 8.5 m sail only and only the 50cm fin.
Techno for younger kids with any sail(non cambered) under 4.5 or OD 5.8, 6.8 or 7.8 and only the 46cm fin. Registered sails for the event should be consecutive 5.8 and 6.8 or 6.8 and 7.8m.
Techno is the official youth class,believe it is 5.8 max for under 13, 6.8 for under 15 and 7.8 for under 18.
Techno plus is the youth olympic class and adults, probably marketed to keep kids who become adults as Bic customers instead of going to RSX.
Techno and Techno plus are both One Design classes!
Two kids could both be using a 7.8m sail but be in different classes, The one using the 46 is in Techno and the one using a 50cm fin is in Techno plus.You cannot change fins during an event.