Well you comment immediately proofs that Radius of Gyration is bad measure then.

One can reduce the radius of gyration by the way you decrease and end up with worse performance. One can increase radius of gyration adn also end up with worse performance. This makes this measure a bad to optimize upon. Better to use the real thing : the total moment of enertia.

>>Something like this could happen if the new rules maintained the minimum mast weight unchanged but eliminated the mast tip minimum weight.

It sure could but why would you want to rule against that ? You end up with a worse performaning bad so this will selfregulated itself into oblivion. No class rule needed for that.

Wouter