I think that you will find that the rules that apply to helis dont apply to multirotors, very different blades and set-up
its just going to be a balancing act, getting enough static thrust out of a higher KV motor, on a pitchy prop to have enough thrust to take off
thinking about my ritewing, it weighs 2kg, running a 1300 kv motor, 9 by 6 prop, and can do a vertical launch, and hits just over 100 mph
so 4 of those, at say 2.5 kg static, so , using a third rule for hovering power, the all up weight would want to be under 3.3 kg
it gets a bit tough - the 4 motors, props, mounts and esc's (80 amp 4S) are going to add up to 300 grams each (1.2 kg total
With a 70 amp static current draw per motor, keeping it all safe, you probably want 15 to 20 amp hour of batteries (so 1.8 kg or so of battery)
not much left for the frame (300 grams)
its all rough numbers, but certainly would be a balancing act, and will jiggling of Kv, Prop, statuc thrust and total weight, would 130-140 mph be out of the question ?