title_body: Why don't solutions exist for a 3-axis helicopter flight controller? So I've been searching around for a 3-axis flight controller for my 450-size helicopter. It seems that nearly every flight controller which is sold today is configured for solely the control of quad/hex/octo-copters, and have little options for helicopters.
  Why don't helicopters have much options for flight controllers?
upvoted_answer: Beta flight has helicopter modes (&quot;Heli 120&quot;, &quot;Heli 90&quot;, etc. depending on your swashplate layout), as does pretty much every other programmable flight controller software.
  The outputs from the flight controller are the inputs for the ESCs, which have the same signal protocol as servos. The exception are the flight controllers with integrated ESCs, where the outputs actually drive the motors directly.
  This also allows most flight controllers to be used in a fixed wing, where most of the outputs drive servos.