The only thing stopping ...
is the lack of a suitable battery.
The equations of flight are well known, and if and only if, a lithium air battery (which gets heavier as it gets exhausted, which is great for take-off) can be developed than prop and indeed ducted fan jet planes able to cross the Atlantic are possible.
As with all things electric in transport the world has been waiting for a suitable battery for well over 100 years.
Biting the hand that feeds IT
