RE: what fin size for a 6.8m on a S type104
Dolf raises a good point about identifying total fin area. Focusing on only fin length can result in quite a bit of confusion for many folks. Contrasting low and high aspect ratio fins can lead to some vastly different numbers with respect to length, yet the total area can be very similar. While we are accustomed to healthy sum of specifications to describe the physical characteristics of boards and sails, fins tend to be represented very one dimensionally.