I've seen a lot of dead topics about LEGO flight recently, but no-one has anything electrical that actually flies.
I did some research, and some math. We need to strip down our 'planes' , take off the plastic motor casing and battery box casing, maybe even just homebrew a battery box. Tethered flight is possible, according to zblj''s principles, but we need to start looking at the untethered side. Maybe this is going to look like a lego-frame quadcopter, but at least we will be using a lego motor, the buggy motor.
Overvolting will also be needed, and maybe a gear-down.