It is preferable for each trailer yacht design to have an Self Righting Index (SRI) test completed.  Although not a prerequisite for registration of a design, an SRI test will provides an indication to owners and designers of a yacht's ability to self right when heeled to 90 degrees under specified conditions.

NZTYA has kits available on request to enable owners and designers to undertake their own SRI tests

The procedure for undertaking an SRI Test may be found here.