Main rotor head

The heli has to respond quickly and directly to steering inputs, and the sensors need instant feedback. Therefore you should chose the rotorhead, dampers and main blades that correspond to this. A stiff and slop-free setup will work much better with VStabi than a soft setup with play in the linkages, soft dampers, and flexible blades.

This is most noticeable on big scale helis that normally have a very soft setup for use with flybarless heads. You will get much better performance using rigid main blades and hard dampers. This will help to reduce oscillations as well, since the system can react instantly and precisely.

3D helicopters often come with very stiff dampers and are designed to use very rigid CF blades, so very little if any will need to be changed.

The maximum hardness is only limited by the effects of ground resonance while powering up/down the system before/after flight. Ground resonance will not affect a heli in flight.

Why do I need a rigid setup if my heli flies great already?

A rigid setup makes any mechanical system more responsive and more importantly, more accurate. The sensors must be able to detect even the slightest movement so the computer can make a correction before you (as a pilot) would ever notice it. A soft connection results in numb feedback for the sensors. Since the VStabi is 100% programmable and "fly by wire", a rigid setup does not necessarily translate to being overly sensitive since flight behavior is programmable. A very rigid setup can still fly very easily and smoothly without any hint of being touchy or unstable. With VStabi, both 3D and scale helis of any size will benefit from a stiff rotorhead and blades. .