One thing is for sure it has to be very light to remain airborne as such a slow speed. the weight of the power source the electric turbo fans all of the electronics for the flight controls and the controlling receiver maybe only a few hundred grams but weight is weight plus the weight of the actual aircraft all adds up. Note even the landing gear retracted.
Pretty cool is an understatement in my book. Helium filled? yeah maybe but 1cf of helium can only life around 0.7 oz.
Never try to tell me it can't be done
When I have to paint I use http://kbs.justoldtrucks.com/
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