Single engine performance of this aircraft is something I believe the design team would have looked at.The handling problems would be quite numerous and variable depending upon flight phase and rotor/propellor position.I have not studied any technical references for this aircraft but if I was on the design team I would put in a coupling to allow one powerplant to drive both rotors.This however requires a lot of hardware and makes the aircraft basic weight increase penalising available payload.
Having seen a number of references I believe this aircraft still has a long way to go before it is mission safe.In its present state you could not put fare paying passengers in it!
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