Actually it is for a custom 1/8 truck I am working on... I want a smaller engine for the higher revs, and on a 13lb truck the torque would be plenty. I know it is not anything to do with airplanes, but the Car guys only know of 19cc and bigger engines, but the compactness of the smaller 14-18cc engines is my preference. I simply don't know where to find one, it seems companies have stopped making them.