title_body: Flying a UAV with a banner? I want to attach a banner to a UAV like this:
  
  
  
  I have two questions:
  
  
  Firstly, is it even possible to fly a UAV like this with the banner visible? 
  What sort of design considerations would I have to take into account when attaching a banner to a UAV?
  
  
  Briefly sketching forces that act on the banner, we can see that there needs to be two strings connecting to the aircraft at A.
  There's also no force that directly counters the weight of the banner, but aircraft tend to solve this problem by simply increasing the length of the banner and having the power to overcome the added air resistance.
upvoted_answer: It should be possible so long as the aircraft has enough spare thrust and lift to counteract the drag and weight. Many model aircraft have good power-to-weight compared to their full size equivalent.
  
  
  For the banner attachment, you need a secure point to attach it to the aircraft, well away from any propellers or control surfaces. Usually this is on the bottom rear of the fuselage.
  It is a good idea to include a 'weak link', which will break if the banner snags; this leaves the banner behind, but saves the aircraft being pulled from the sky.
  You will also need to weight the banner to hang in the correct orientation - making the vertical part of the banner support bottom heavy should suffice.
  
  
  You can fly banners from both fixed-wing or rotary wing aircraft, in slightly different ways. Fixed wing banner extends behing the aircraft, whereas on a helicopter or multirotor the banner hangs below.
  
  Image source