Stanford University’s Biomimetics Laboratory has developed a drone which is able to cling on walls and stay fixed.
The airplane clings on walls thanks to small spines on its front feet.
The main difficulty with this technology is being in a position to be able to make the plane land on a vertica
This is a companion discussion topic for the original entry at https://community.robotshop.com/blog/show/drone-airplane-that-attaches-to-walls