This question can best be answered by quoting the full section on righting and crew weight



1.8 Righting

1.8.1 It is the responsibility of the crew to ensure that the boat is equipped with a righting system that will enable the crew to right the boat without outside assistance.

1.8.2 The Formula 16 Class Authority may demand that a crew demonstrate their ability to right their boat, but only at a time when doing so does not directly affect the fairness of racing.



1.9 Minimum weight of the crew

1.9.1 There will be no other restrictions on crew weight apart from the requirement that the crew
weight must be sufficient to right the boat unaided under all encountered sailing conditions.



So if your weight is insufficient to right the boat then you are allowed to correct this by implementing a different righting system that does allow you to right the boat with your given crew weight unaided.