title_body: Is it possible to control an RC plane using reaction wheels? I recently had an idea involving reaction wheels and a model airplane. Would it be possible to control an RC plane using reaction wheels rather that servos and control surfaces? Would a reaction wheel controlled plane be able to function similarly to a "normal" model airplane and would this be practical at all?
upvoted_answer: Yes, it would!
  
  A YouTuber, Thomas Stanton, has actually built a helicopter controlled with reaction wheels in this video!
  
  However, for a fixed wing aircraft, you would also have to consider the location of the reaction wheels relative to the centre of mass, and you would most likely want to house the reaction wheels internally to avoid adding extra drag.
  
  You would also have to have a reaction wheel for each axis.
  
  However, this should be relatively simple, so the answer to your question is yes, it is possible.
  
  In answer to your other question of practicality, as far as I am aware there have not been enough studies in the RC sector to say for certain, but my personal opinion is no, it would not be practical due to the added mass and the problem of weight distribution, plus the limited space inside an RC aircraft and the advantageous torque traditional control surfaces give.