Crab,
Consider your proposition - one engine has failed (for an undetermined reason) and you elect to fly a normal approach to running landing on your runway.
Keeping it simple (No Vtoss/Vy/Vbrocs etc.)
We at Bristow (and CHC I believe) irrespective of twin type fly Commercial Air Transport (CAT) take-off and landing profiles to either Performance Class One (No exposure in the event of a power plant failure) or Performance Class Two (possible exposure for minimum period) depending on space available for take off or landing. We calculate and adhere to decision points (TDP and LDP) for each profile.
In the event of an engine failure in flight we would in almost all circumstances
elect to fly a normal approach to running landing on your runway.
Until LDP we are well outside the
SINGLE ENGINE H/V curve and at LDP (for example in a Bell 412 at 100 feet rad alt and 40 kts IAS) reach the leading edge of the
SINGLE ENGINE H/V curve - we maintain 40 kts to 50ft rad alt then reduce speed and altitude by flaring for a running landing staying under and clear of the curve throughout the profile.
With both engines performing impeccably or following a failure we
avoid any exposure!
Hopefully you will now appreciate that we have absolutely no requirement to attempt an autorotation which may be a "piece of cake" (as Biggles and your good self would probably say!) to Chaps of your calibre but to most of us other mere mortals normally takes several attempts during Sim rides before you avoid the "red death" since we have little opportunity for practice during our day jobs.
Even in the event of a tail rotor control failure where normal options are either a full autorotation or high speed run on landing - I personally advocate a mid option which is a 1000 ft/min powered descent at 40 knots (approximately) to the left or right side of the runway (depending on rotor rotation direction) followed by a gentle flare and rapid throttle shut off (to a last minute auto landing) at approximately 30 feet to a short run on remaining at all times on the runway. Try it next time in the Sim (doesn't matter which type) - it works and has a much higher survival rate than either of the other options!
Trog