>>4465275P.S. today electric propulsion RC airplanes are damn cheap. Maybe your dad would appreciate flying one of those impeller models? They are damn cool to build and fly - it is not as hard as in the 1990s when they were all expensive and gasoline powered. Today everything is cheap, easy to build and with rechargeabel lithium batteries. If I had kids (I have not and am regretting it...) I would buy them RC planes all the way.