ORIGINAL: Red B.
ORIGINAL: Silver182
A requirement of the radio is that it's software will allow a 1 second delay or HOLD condition before going to the snap-roll condition. JR's earlier 10 channel radios had a fail-safe feature that would allow the user to set the time delay before surface activation. The later 10X radio transmitting to an S-mode receiver does not have a delay feature. In fact there is NO time delay before activation. Can you see why no one with this type radio wants to hear anything about fail-safe settings other than HOLD...
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As I have mentioned several times before the reason the turbine manufactures have a time delay feature within the ECU is to allow a shutdown fail-safe setting required by AMA for turbine use! Yep, the most widely used radio the JR 10X would not be usable.... in the turbine world if the turbine ECU did not have the time delay feature included within it's software.
Lee H. DeMary
AMA 36099
I don't get it. What is the point of having the radio apply fail safe settings to the control surfaces while the ECU delay allows the engine to go on for another second. Wouldn't it be better if the engine was cut/reduced to idle as soon as possible, i.e., at the same time as the control surfaces are moved to their fail safe positions?
The 1 s delay in the radio is there to allow for short duration interference. The Rx applies a hold setting until the interference either dissapears, or if more than 1 second has elapsed applies the pre-determined fail-safe settings. The 1s delay in the ECU doesn't solve the problem of the missing delay in later JR 10X radios operating in S mode.
/Red B.
Hello Red,
I hope everyone understands the reason for PCM in the first place..PCM encoding provides a hold time so all of the little short duration.. 1/8 second 1/4 second...1/2 second glitches are never seen by the pilot.
If the turbine manufactures had not come up with a time delay system within their ECU's... no one would be flying the JR 10X especially when flying a turbine powered aircraft! It is mandatory here in the States to use a radio capable of providing fail-safe shutdown. We have a mandatory 2 second Max time delay before shutdown per AMA. Turbine shutdown is required during a R/F link failure. No time delay would equal flame-outs all the time!
Red, your sorta correct... except that the time allowed by your turbine ECU... Example the JetCat ECU can be set for any amount of time delay before the turbine actually shuts-down! Anywhere from 1 second to 10 or more seconds! The turbine ECU time delay solves the JR 10X no time delay problem for throttle channel only.
Of course it doesn't solve the problem for the remaining channels. The 10X fail-safe is all but un-useable on any channel other than throttle! The 10X does not have a hold time delay so all short duration interference is seen by the pilot just like a glitch of yesterday... that is if fail-safe presets are used. That is the reason very few if any pilots flying the 10X will ever preset fail-safe GO-TO settings! All flight surfaces are usually set for HOLD only..
JR has known about this programming Error for many years as I have told them about it for several years... they just don't care to fix the problem.
Lee H. DeMary
AMA 36099