Flying a Flybarless head on RC helicopters is no different to the large scale crowd of Remote Control Helicopters because many scale birds with muti bladed rotor heads have been there for many years. The challenge comes with difficulty to control and the ballooning issues of flight; the probability of pitching up if one does not hold in forward cycle. Most people in this hobby would never have considered using a true bell rotor head with no flybar stabilization. Today, there are huge improvements in electronic miniaturization and accelerometer technology. It is now a reality to go Flybarless and it has some wonderful opportunities compared to the old flybar in all types of RC helicopter.
The costs are coming down all the time making Flybarless systems get even more and more popular. There are Remote Control Helicopters manufacturers including Align who offer most of the RC chopper kits that include their new 3G Flybarless and flybar versions. The lower cost entry level is beginning to embrace the technology including blade with the mCP indoor micro heli. Use of electronic flybars in toy RC helis is a favorite in that once you fly one; chances are that you will not be going back to a mechanical flybar.
What makes up a Flybarless system? Many of the electronic flybar systems are made up of the gyro/accelerometer sensors and mixed/control unit. They can be combined in one unit such as the Skookum Robotics SK-720 electronic flybar system or separated like in the Futaba’s CGY-750 3 axis gyro systems. The head is another part of the Flybarless system. It can be a complicated muti rotor bell head or a simple two bladed bell head. The difference to note in this system is there is no flybar. The heads and associated hardward are purchased separately from the electronic stabilization portion. The Align Company are offering most of the Remote Control Helicopters kits in 3G version and making it so easy and convenient for conversion of the T-Rex to Flybarless or build with electronic stabilization.
The working of a Flybarless system is best understood if one understands what a flybar does. The flybar adds stabilization to the rotor disc when it automatically changes the cyclic pitch angles of the rotor blades so as to make cyclic control more manageable. Flybarless does not have a flybar but depends on the electronic stabilization systems to virtually replace the flybar. That is the reason why they are called electronic flybars. The scale boys and girls were the first to experiment on the electronic stabilization systems with their no flybar birds. When the solid state heading lock was first coming to the market including the Futaba GY240, more and more scale fliers using bell heads were putting tail gryo in their birds for detection and correction of unwanted yaw movement and also installing two more gyros mounted vertically to pick up the pitching and rolling movement of the Remote Control Helicopters.
The cycle roll was plugged into the gyro to detect roll and the cyclic pitch was plugged into the gyro to detect pitch. When the heli pitches forward, the gyro that detects pitching movement sends a command to the elevator servo so that it tilts the swash backwards to automatically bring the bird back to level flight.
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