Vic, if that’s the civilian version of the Cessna used in Vietnam, it flew almost as well on one engine as with two. It turns out that the turbulence created from the forward engine disturbed the air so much going past the rear prop that the thrust was reduced quite a bit. Maybe someone knows the real answer. I built a couple of inline twin models in the past and I know they were not as fast as a conventional twin. Looks like a good project. Keep us posted. Dan.