Considering that the ++ is really an "A" model with 1S1 Arriels rather than the RR C30.....with an increased MTOW........... .. .Something has to give to keep the coning angel under control........if the MTOW increases whilst the Nr remains the same.......guess what happens to the coning angle...???. .. .Increase the Nr, whilst increasing the MTOW....and the coning angle remains acceptable [maybe even the same]..... .. .The 2nd question.........let me get the ++ books out.......... .. .The 3rd question........who certified and flew the first A++'s........??. .. .Keep your revs up...!!!!!