I am no electronic expert and will not pretend to be. I was just stating a more "common sense" general type of view.

I don't think that RX manufacturers have done testing like this for us. I have seen individuals here on RCU that have done their own testing though, and it seems the consensus is that if you are going to have 10 or more servos on a plane you may be exceededing the capabilities of the RX bus and you need to use either a second RX or some kind of power distribution do-dad in order to get enough power to the servos.

Maybe someone else with more knowledge than me can chime in here and give their test results or opinion.

Each individual set-up is going to have a little different loads and requirements depending on many different factors. I'd rather play it safe and know my servos are getting the power they need. If there is any question in my mind I will go ahead and get the 2nd RX or do-dad. For me personally, anything over 30% scale will get a 2nd RX or do-dad, but as I said earlier, this is a personal decision each of us has to make depending on our own tolerance of risk vs. money.

Jim