It is probably mainly a variation of my previous idea about swarms
http://ideatarium.blogspot.com/2014/09/quadcopter-swarms.html
To carry heavy loads (I mean part of a bridge, assembled homes....) propeller only fan structure could be built.
The engine an the cockpit are in control ground vehicle (traditional cockpit with rest stuff is possible of cause, it is just one more sub-idea). Remote cameras, energy and so on by wire... with double connection (to jump over obstacles).
It is very wide radius (to maximize lifting) with spinning circle motor and base. Due to large size of the circle-motor itself the permanent magnets could be light and thin (not sure). Fixed rotation angle - control like in quadracopters by changing individual fan speed.
Coaxial fans could be used, but 3 clockwise to 2 back spinning fans (with calculated radius) looks better to me for now.
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