Not quite what i was thinking of... When you said multi-rotor, I was thinking something more along the lines of several of those things in your hand stacked together on a single armature, and a 2 piece housing bolted around them with coils that stick down in between each rotor.
Kind of like this:
-|:|:|:|-
Where | is part of the housing, and : is one of the rotors.
__________________
"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
|