How dangerous is it to run an electric for a full flight run on the ground? I have run them for about a minute with no problems but never the full 4.5 min. I do it all the time with IC but they don't have timers and esc's, just needle valves. I am concerned that the plane needs the forward motion to get the proper draw on the battery and enough breeze for cooling.
One more of the seemingly endless list of things to learn about electric.
Ken