This new nasa test plane is promising for electric drones.
My upgrade idea is to add propellers in one line to reduce the drag. Even though stack up propellers are not as efficient, we use them only in take off mode. Than the axis moves down joining several of them in one.
Blades could be inserted in each other with flexible skin.
http://blogs.scientificamerican.com/observations/2014/12/12/first-flexible-airplane-wing-takes-flight/
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