I'm a scale guy and the fullscale airplane had IC therefore the scale model will. A fullscale Sonex flew with an electric motor and has the same flight time limitations as its electric model bretheren. I'll stick with IC. It's more fun for me! I like to tinker, tune and etc. I always chuckle about the 'clean and quiet' attributes of electric. The dirt and noise are just somewhere else in the power grid before it gets to your battery be it 'nuke', hydro or fossil fuel.