I've a small model, 36" span, looks like a design called Das Ugly Stik. I wanted to use it as a means of getting to grips with Open-TX and Taranis programming. I'd managed to load a couple of models into the Taranis, so I thought it would be quick and easy to replace the Stik's Spektrum receiver with a frsky V8R4-II. I found that the only easy thing was plugging the servo leads into the newly bound frsky receiver. At switch on, all the servos were reversed and there wasn't an "arming beep" from the ESC. After a lot of mistakes and inadvertent deletions, I had the servos responding the right way round, but nothing from the ESC, a JETI Advance 40Plus. This is a fairly old item and used to have an arming switch, now replaced by a Deans socket and plug. I was at a loss as I'd rechecked all the connections, the battery was freshly charged, but the ESC remained silent when the circuit was armed. As a last resort, I unplugged the battery with the arming plug connected, waited a short while, then plugged the battery in again. Promptly the servos all responded and settled, then the ESC started to beep. Happily the motor runs the right way when the throttle's opened. I switched off by removing the arming plug, waited a while then plugged it in again. Happily the ESC started to beep right away. Can't imagine why it wouldn't work until the battery was unplugged then plugged in again, I thought that using an arming plug would do the same job as the switch it replaced. Perhaps it was due to being fired up in reverse at first switch on.