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I sail an old 5.2 and I love it. I sail it solo 90% of the time and it is great to sail that way.

When the wind really picks up I don't use the jib and still can solo easily.
Also I can right it solo at 6 foot tall and 180lbs. I don't think I would go much larger than the 5.2 for solo sailing.

Same here. Really old 5.2. I've added a asymmetric spi and I sail solo most of the time. If it is really windy I leave the jib in the trailer box. I'm fine (at 100kgs) up to the 20 knots mark, and on survival mode from 25 and up.