RE: Twice the scale, now how about the motor?
to cut to the chase-
as th model gets smaller it has to get increasingly lighter
As it gets larger - it has to have increasingly greater power
asign numbers as it suits .
The B19 and the B36 were classic examples of how the need for power increases far more than suspected. Even by real honest oto god degreed aeronautical engineers.
on 4 ounce foamies indoor areobatics - a few grams of weigh can wreck performance.