With all the advances in electric motors and batteries (personally) I think electric is the way to go in .25 size and smaller aircraft. I have not seen anyone in the past year bring a new .25 sized plane to the field that was not electric. I would not be surprised to see .25 size glow engines (for planes) discontinued in a few years ... they are just not selling. Electric power (even great quality high performane components) are very reasonably priced for aircraft .25 size and smaller. Bob