Hello,

How to use a drone in narrow spaces:
http://www.wired.com/2015/02/drone-bounces-around-disaster-sites-like-beach-ball/

Bertus

 

Nice idea, I guess the open frame work could snag on protrusions but still a neat idea

 

I saw a similar aircraft made from Japan a several years ago, it seems like a air spy came up from the science movie, it can go anywhere and doesn't worry about it to hits anything, and I also thought why the real helicopter doesn't want to using some protection like this, maybe it's related to some aerodynamic.

 

See Litehawk High Roller

 

A bit like the indoor bumper of the popular Parrot Drone.
http://ardrone2.parrot.com/
Max.