Throttle Jockey Direct RPM Version
Model Avionics have produced a new version of the Throttle Jockey aimed at the thrifty modeller who expects accurate rotor speed control. By using this version any entry level helicopter radio may perform full 3-D flight. There is no need to spend extra money on a new radio in order to wet your feet into full blown aerobatics.
Simple hook-up requires no spare channel.
The accuracy of this new unit is the same as the original so I encourage you to read the initial review. This direct rpm version does not allow in-flight rpm alterations so you are limited to one regulated rpm in all flight modes mode. Many people have need of only one rpm, so this generally should pose no problem. The red sensor and green setup/on-off LEDs perform basically the same monitor functions as the original TJ.
Operation of the unit is quite simple. It records throttle end points in its non-volatile memory during the initial setup phase. This is by measns of the RPM adjustment pot during boot up. This is required only once, or any time the throttle linkage is altered. This same pot is used to adjust the governor RPM from roughly 10,000-20,000 engine speed.
The blue rpm adjuster is easy to access.
The unit turns on and off as referenced to a low throttle servo position of about 25% ATV. Aerobatic throttle curves need all points set above this value. The throttle hold curve must be set below this in order to allow autorotation by turning the governor off. It is my advice that all aerobatic throttle curves be set so that even if the governor did fail, rotor rpm is maintained at all collective stick positions. This reasoning is because the TJ will feed the throttle curve directly to the servo if the sensor ever fails, or the fan throws a magnet. This throttle curve setup discipline is a standard and should be employed with all governors.
Connections to this unit are to the sensor, to the throttle servo and a plug for the receiver throttle channel. RPM management doesn’t get any simpler or less expensive than this.