Hey DH (been a while since you signed a post with that one) You are far from perfect. Very few in a modeling forum speak of a rider scale bird when deciding what power is needed for the models we fly. In most cases we use significantly more power than the rider scale stuff does. In short, I think your numbers have too much brown porridge in them. Most real modelers understand that flying a model at mach 1 + is impossible due to limitations in human physiology.