Good morning Rotorheads,
Well that seems to put my career as a vertical lift designer well out of the window, but I have now arrived at the answer that I suppose I was asking in the first place, However perhaps Nick could help with this, Why is there such a huge difference in the required HP that you quote from the spinning rotor to the vectored thrust, is it to do with the aerodynamics of moving air,or in the case of the Heli is it that the MR can be so much larger than the fan on a vectored thrust system and will be therefore more efficient?