I do not know what Helmet Fire is refering to, but my prof always said, there is not such thing as a centrifugal force. It is an imaginary force. Using that, you can calculate the forces on anything that turns in a kind of static system. It is the centripetal force that keeps everything flying in circles. But that one is exactly opposite to the "centrifugal" - imaginary - force. There is no "force" that pulls outward on a rotorblade, but there is a force that pulls the rotorblade towards the mast and keeps it flying around. But it is an accelerated system and that is a bit more complicated to understand and calculate then the normal physics we learn in high schools. For the helicopter pilot who normaly knows his high school physics it is easier to imagine a static system where all forces are balanced. And it does not really make you a better pilot to understand that stuff.
Now I duck for cover because the last time I had to use that was a long time ago.
Have to go changing diapers. Daughter very angry.