For those folks that have trouble getting to sleep at night....and as a reminder to most of us the difference between working pilots and Test Pilots....I recommend this Research Paper for some light late evening reading. It was done in 1985.
http://www.ntrs.nasa.gov/archive/nas...1986020337.pdf
The statement that jumped out at me was the comment about Autorotation being an Energy Management Technique.
The aircraft used in this study was a Jet Ranger with a High Energy Blade System....weights in the Spar Cavity at the end of the blades for those of us that have trouble tying our shoes.