Unregistered

71kg, male, 10+ years of windsurfing (mostly on weekends), inland lakes

F4 - board 110L, sail 6.5m
F5 - board 110L or 85L, sail 5.9m
F6 - board 85L, sail 4.4m (quite rare)
F7 - never met such conditions on those weekends when i was windsurfing