The 40 size Balsa USA bipe is the Phaeton II. A saito 56 or 72 will make it whirl. You can also fit engines like the Magnum or OS 70 four strokes in them. Anything bigger than the Saito 56 and it will have a lot of power. A OS or Magnum 52 four stroke would make it a nice sport plane.

It is a great flying sport plane. It is close to the Andres Aeromaster in the way it flies.

The build on this plane goes real fast because of the more simple way it is designed. It doesn't have as many parts as the Hog. Though the Hog flies well also.

Enjoy,

Jim