Flybarless (FBL) helicopters have quickly become the preference of both sport and extreme 3D pilots throughout the world. FBL controllers have continued to become better, cheaper and smaller. But has helicopter linkage geometry kept pace with these changes? The basic mechanical requirements for a FBL helicopter are straightforward, but not all helicopter manufacturers have considered the importance of optimal geometry for improving the FBL control loop.
We started with a range of servos suitable for the Oxy3. We then measured angular movement of the servo arm at different pulse widths, and recorded the variation over different makes of servo. We calculated the optimum swashplate ratio of collective to cyclic travel, and then simulated a range of swashplate and head geometries and integrated our previously measured servo deflections.
We performed all these measurements and simulations with one goal – to optimize the Oxy3 servo-swashplate-head geometry to allow modern FBL systems to perform at their best and to optimize their control loop behavior.
Not all FBL systems provide users with control loop geometry feedback. This gives a false sense of security – you ‘think’ all must be ok, when in fact the FBL controller is working outside its best performance envelope. And when you do have feedback on the suitability of your control geometry, some helicopter designs leave you with few options to make changes.
With our Oxy3, all the hard work is done. When using almost any mini servo, and almost any FBL controller, you will immediately find the control geometry optimized for best performance. There is no need to modify head geometry, change the swashplate, or scratch your head wondering what to do. And you will be surprised at the flight performance!
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