Once again, so everybody understands, turning off a transmitter before the flight pack is unplugged, whether it is in flight or on the ground is NOT a good idea!
Develope and religiously follow safety protocols!
The whole idea of the 'turning off the tx in flight' scenario is to test the failsave goes into failsave when plugged into the assistant screen, it is not intended to be done in actual flight.
It is a last ditch effort and if everything is set up properly, a big IF, it will safely return your acft home.
However, there is a lot to set up properly to do this.
To test your rth capability just use your failsafe switch on the tx.
Think what would happen if you turn off the radio in flight. First, in order to reestablish control it would need to rebind first, a time consumming event. Should somehing go wrong, it happens very fast.
If you feel the need to absolutely test your system by turning off your tx, then at least make sure you are smack dap in the middle of butt-**** nowhere totally out of battery range of the acft to reach anything! Nver do this in a city park, your back yard, a school yard,,, you get the idea.
If you feel he need to test this by turning off the tx in flight then you had better be first extremely familiar with not only the WKM, but your transmitter and it's failsafes, the enviroment you are flying in and the terrain around you.
Also, Better check what your insurance adjuster has to say about you accidentally crashing this thing into a baby carriage mangling the baby permanently for life. I can pretty much guarantee you the judge isn't going to give a damn when you look a him and say, "but according to the directions",,,,,
fun yes, toys mabe, lethal yes,,,