I am an instrument rated pilot with a commercial rotorcraft license. I recently switched to a new school to pursue my CFI and CFII. They gave me a checklist of topics that my lesson plans should cover, and one of those listed is something called "blade sailing". I have never heard this term in my two years of flight school, and neither has the Helicopter Flying Handbook. Google searches have led me to plenty of academic studies on the phenomenon, but nothing from a pilot or training source. I understand the basic idea, which is that at low RPM and in high winds, rotor blades can flap excessive