Originally Posted by DJ
Discussing mobility within one's enviroment. ~ Do you mean that most folk swim with one arm?
No, but if you watch horses gallop they lead with one foot, and most sprinters will start with one foot. Not beating you up old boy, but X2 does allegedly have a hub drag similar to single rotor aircraft. Intermeshers main benefit is reduced drag by having a low hub profile. Interleavers can't be as aerodynamically competetive due to outriggers etc.
Nature produces the solutions it does, by optimising it's "designs" over time to suit their environment. We have the advantage of understanding ours (Navier-Stokes and compressible flow in this case - or using CFD). While perhaps the response provoked was a little strong for what was just an honest mistake on my part, you should argue the case for your concepts on weight and aerodynamics benefit. Already X2 design indicates a need to index the blades, so perhaps intermeshing will hold some advantage
Mart