Originally Posted by
raydar
The turbine will shut down automatically if it did not see a rx throttle signal for a few seconds (loss of rx power), you do not need to anything there. However rx failsafe also needs set and that will depend on your radio/tx. For example I use frsky and if I left the failsafe set to hold the turbine ecu would never see a loss of throttle signal if I turned off the radio so instead I program the failsafe to receiver and carry out the process of holding the failsafe button with trim down and throttle kill on to teach the receiver to go to "shutdown" on radio switch off. So you basically treat setting failsafe the same as you do for any other powered plane with your particular brand tx.
Right, so in that case, when your receiver goes into failsafe, the turbnine shuts down immediately, just as if you brought the throttle stick and trim all the way down. There are two problems with that, first, you get no delay from the failsafe event to turbine shutdown (AMA rules allow a 2 second delay for this action), and second, if the receiver signals comes back, the ECU is already in shutdown mode and most will not go back to running mode if that happens.
On the Jetcat ECU's, you set the failsafe setting in the receiver to be the *maximum* travel low throttle position. Then when you "learn RC" on the ECU, you set the normal low throttle position to only 80% travel. That way, when the receiver goes into failsafe, the ECU see a signal that is "out of normal range" and goes into failsafe mode, not shutdown mode. Failsafe mode has a user-adjustable delay (0 to 5 seconds, I believe) where the turbine continues to run. If the receiver signal comes back in that time, the turbine goes back to normal run mode. If it does not, it goes into shutdown mode.
The older style "Xicoy" ECUs that Jet Central, and I think Kingtech used, did not have that functionality. The newer ones might have it. The Jetcat ECUs have had that functionality since they first came out.
Bob