Originally Posted by
wfield0455
That's simply not true, at least not in many cases. While Spektrum sets a throttle fail safe during binding it's really easy to Teach RC without having your throttle fail safe set at all on many systems. Even with Spektrum I've seen many people bind their receiver, then decide to reverse their throttle channel without rebinding. In this case if you simply perform teach RC you will be able to shut down your turbine on command while you have signal but if your system goes into fail safe not only will the turbine not shut down, it will go to full throttle and you won't be able to shut down your turbine from the transmitter at all.
Whether you care about logging an accurate shut down cause or not you should ALWAYS verify that your fail safes are set correctly and test that they work properly before flying any new model, especially turbine powered models.
IMHO, conflating a Rxer's failsafe and a ECU's failsafe above does NOT get you off the hook for confusing the OP's original question. KISS
To the above specific points, … The ECU failsafe has nothing to do with the Rxer's Failsafe. The ECU does not care if there is a Rxer failsafe. The ECU failsafe functions at a total loss of Throttle Signal, Hi/Low Turbine exhaust temp, etc. (e.g. like total loss of power to the RXer or the throttle harness disconnected from the ECU.) Even if the throttle is brought back to idle by a failsafe on an RXer, a throttle signal is still there. Even if the throttle channel was reversed and the RXer's failsafe was not reset, the throttle signal would still be there. Once RC learned, both of these signals would be above low trim, so even a normal shutdown would not be initiated, let alone a throttle based ECU failsafe!
First time turbine jet setups need to be face-to-face with someone who has experience with the particular radio and turbine and set them up on the bench together! Otherwise too many things get missed (e.g. flight modes, reasonable control throws & flap settings, CGs and wire routing, etc.) This type of collaboration is much more effective than trying to ferret out the useful information from a bunch of off-topic forum B.S. - KISS.
You are right about verifying that both failsafes work correctly though. Shut off the transmitter, and see what happens. A failsafe takes 2 seconds. A normal shutdown cycle will be immediate at low trim. Again, these are two different functions triggered by two or more different initiating conditions.
As far as knowing when a ECU failsafe has occurred, with the thousands of flights I have either done myself or observed on the flightline here, I can't recall anyone experiencing a failsafe. I personally don't think it is worth confusing a normal setup to maybe see a turbine message relating to an event that most-likely will never happen! Again - KISS. All you need to know is in the book!