Lets dream high electrical permittivity!
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Btw, that sonex Wainex plane could have about 100kg worth of batteries with 52kw motor. So with current LiPoly tech it could store 12kWh. From estimates that it has 42mpg mileage !! and from that to about 17kwh/100km you could probably fly this thing for about 60-70 km. With Eesto estimates that could be extended from 150 to 400 km. That is a all great, so lets dream electric. :P
Maybe for Australian bushes where you can be stranded in the wild without electricity, that kind of a plane fitted with solar cells would be great even if you could only do jumps of around 100km.