Originally Posted by
rangerpaul
Sean - I went back and watched both the Bad Boyz RC and Thomas Chiang videos and you are right. Both only use two data line connections, not three. They use the SBUS2 and do not connect the throttle to channel 3 directly on the receiver. I removed my third data line between channel 3 on the receiver and PPM on the ECU and it works just the same. So I am not sure why the CRX manual shows two data lines coming from the receiver to the ECU and one being from throttle to PPM. Chaing's video is much older and apparently there is no "Telemetry" plug in named on the ECU. He refers to Data Bus instead. The Bad Boyz video is much more recent and they do refer to a "Telemetry" assignment on the ECU. So for now, I have removed the third throttle line. I would still like to hear from a tech expert why they both work and which one is the safe connection for flight. But, thanks for bringing this to my attention as I am here to learn!
I'm still learning too. I've got around 14 flights on my plane with a SW80 and R7014SB using the single Rx SBUS2 to ECU Telemetry connection carrying the throttle and telemetry data...so far no issues...but I too would like to verify that it is still safe to fly in that configuration.
And actually, in my last 4 flights, I installed a hub so I can run GPS as well. So my configuration is Rx SBUS2, to hub, then ECU Telemetry (with throttle) and GPS Sensor plugged into the hub. Thus if anyone sees a problem with this, please chime in.
Sean