Did Igor work out all this stuff early on, or did it evolve with each
new generation of helos? I mean, were the VS 300 and R4 capable of
controlled autorotation, etc.?

Yes sir....

We certainly owe a lot to Uncle Igor. BTW, I haven't seen anyone include the
actual definition of an autorotation in this thread:

Autorotation, (n)., a method of keeping the pilot's hands and feet busy as he
plummets to his death.

v/r
Gordon
====(A+C====
USN SAR

Donate your memories - write a note on the back and send your old photos to a
reputable museum, don't take them with you when you're gone.