Faster than a Speeding Motorbike
But - watch that rotor - the disc is always at positive aoa.
May I suggest that the flight phases are:
HELICOPTER FLIGHT
In forward flight disc at negative aoa
CATACLYSM
something breaks or stops
TRANSITION
from helicopter mode to autogyro mode.
AUTOGYRO FLIGHT
In forward flight disc at positive aoa.
The key here is knowing in advance what control inputs will effect the transition. In forward flight the disc aoa has to be quickly flicked from -ve to +ve and other normal control adjustments made. It is misleading to call this a flare. It isn't, it is just a quick flick to change attitude. It you sail or fly a wind-powered machine you will understand.
Yes, OK, I'm not even a novice, have never been anywhere near a real live helicopter, my interest is purely theoretical, so please feel free to tell me to "go away".
Thank you for your kindness and tolerance.
Best and most humble regards,
henry_crun