ORIGINAL: rhklenke
Again, if you listen to the video, I do not think that the RX batteries died because the turbine keeps running. It sounded to me like the airplane when into failsafe and the owner had not set the failsafe on the engine to shut it down - only to bring it to idle. Am I missing something here?
Bob
I'm notagree with that assumption.
ECU (and turbine) is powered by his own battery. If the receiver is shutted down by a loss of power, the ECU is still running with his own accu but detect the loss of the receiver => go to fail-safe mode.
Don't know this particular ECU, but with Jetcat ECU, a loss of signal don't come to a instant shut-off of the engine. When ther's a loss of signal, the ECU down the turbine to idle. If signal has not come "on" in the future 2 or 3 seconds, then the ECU shut-off the turbine immediately. (This is a way to permit recovery of the plane if loss of signal what temporaly)
On this video, it seems there's a loss of signal or of power : the engine go down to iddle and the other command seem's to be in "hold" mode and frozen. The pilot ordered a slight left rool for a turn when signal was lost, and the model continue to rool constantly. Then there is no more than 2 or 3seconds before the model crash, so it's not abnormal for me that the engine was still idle when it hit the ground.
A sad crash, and the video is very impressive.
But this is not enough to say if it was a loss of power (servos are frozen where they are with no more movement), or a loss of signal between transmiter and receiver with receiver going in "hold" fail-safe mode. We need to know how were the settings of the fail-safe, and how work the ECU when it goes to fail-safe.
Regards.