RE: Twice the scale, now how about the motor?
To build a plane that is twice as big, you multiply every dimension by the square root oftwo. This is 1.414. If you multiply every dimension by 2 you will have a plane 8 times as big as the original. You must also include the height in the formula for the volume. Nearly all the drag is created by the wings. The fuse contributes a lot of parasite drag. Drag increases as the square of the speed. If you fly at 50mph with the original size plane and then double the size using 1.414, the drag will increase 4 timesif you fly at 50mph. With an increase of 4 times for drag, you will need 4 times the power to fly at the same speed.
Wedge