Convertable T/R
We all know the technology exists to swing an engine and rotor through an arc of some degrees ala the MV22 Osprey, so take that mechanical technology to the tail rotor and when in forward flight which does not need the stabilising effect of the counter torque produced by the tail rotor, then use that rotor as a pusher propeller by swinging it through 90Deg.
Has it been tried? Would it work? or would this sort of attachment be too risky or tricky to be of any use?
PeterR-B