Was reading this article:
No Margin for Error | Business Aviation content from Aviation Week
It mentions that all certified helicopters should have a published time to enter auto-rotation before catastrophic loss of rotor rpm. I haven't come across these figures before. A Google search reveals only 1.6 sec for the r22 and 4 sec for the r44:
Robinson R22 (with some comparisons to the R44)
This slide states 2 seconds for the AS350:
http://www.ntsb.gov/news/events/2013...esentation.pdf
Odd figures in themselves, can anyone verify these?
I was interested if anyone could post published times for other aircraft?