Trying to clear the Mud--- Fail-safe continued
11-26-2003 | 07:30 AM
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Trying to clear the Mud--- Fail-safe continued
>>>>Matt www.jetcatusa.com wrote in a now closed thread<<<<<<<<<<
>>Discussing 2 distinct scenarios:
1.) A normal failsafe gets generated by the receiver. In certain radios (JR 10X?), a delay can be programmed in, wherein the radio goes from "hold" to whatever the failsafe preset positions are. This is the delay you are describing I assume? This failsafe occurs, after the delay, the receiver commands the ECU to shutdown in the same matter as pulling the throttle back...the ecu cannot distinguish this from a normal shutdown whatsoever. I agree in this case, your radio would distinguish between a commanded (emergency) shutdown and a failsafe (delayed) shutdown.....sounds good to me. I fly Futaba and we do not have this feature, at least not in the 9ZAPS unless I missed it.
2.) Again, a normal receiver failsafe occurs, but in this case, it is interpreted by the ECU to be a failsafe event, completely independant of the normal shutdown of the turbine. In this case the delay is introduced by the ECU. This could cover the cases of radios that do not have the failsafe dely feature.
Clear as mud, right?
_____________________________
Matt
www.jetcatusa.com
Yep, Matt you missed it the Futaba 9Z series radios have a (non) user adjustable 1 sec. time delay before a pre-set fail-safe condition (position determined by user) is activated. Try it if you don't believe me --- program in up elev. fail-safe condition so you can see the reaction time ---- then just turn off your transmitter !QUOT!notice the 1 sec. time delay before the elev reacts!!
And Gordon ---- sorry to say it but you can't rely on what the JR 10X manual says if you believe there is a 1/4 sec. delay --- or any time delay at all when transmitting in the S mode! Try it and you'll see that fail-safe reaction is INSTANTANEOUS as I said before. This is one of the biggest reasons why Jet Cat designed a time delay feature into their ECU's! If you are transmitting to the older type receivers Z mode you'll notice your fail-safe screen is different --- the user now can program in up to 1 sec. time delay before a pre-set condition happens, i.e. (up elev) etc........ When you switch back to S mode transmission all user input time delay features disappear......
Lee H. DeMary
AMA 36099
PS This has been my biggest grip with JR since the infamous 10X /S mode was introduced-- and JR has never re-written the software. I think it was just a screw up in programing, never to be fixed..... The 10X user has two options for each channel ---- Hold (which everyone uses) ---- or a pre-set fail-safe position but then there is zero time delay before activation! Try it and time the reaction speed speed there is NO time delay!
Have a happy Turkey day ------- Just the facts folks!
>>Discussing 2 distinct scenarios:
1.) A normal failsafe gets generated by the receiver. In certain radios (JR 10X?), a delay can be programmed in, wherein the radio goes from "hold" to whatever the failsafe preset positions are. This is the delay you are describing I assume? This failsafe occurs, after the delay, the receiver commands the ECU to shutdown in the same matter as pulling the throttle back...the ecu cannot distinguish this from a normal shutdown whatsoever. I agree in this case, your radio would distinguish between a commanded (emergency) shutdown and a failsafe (delayed) shutdown.....sounds good to me. I fly Futaba and we do not have this feature, at least not in the 9ZAPS unless I missed it.
2.) Again, a normal receiver failsafe occurs, but in this case, it is interpreted by the ECU to be a failsafe event, completely independant of the normal shutdown of the turbine. In this case the delay is introduced by the ECU. This could cover the cases of radios that do not have the failsafe dely feature.
Clear as mud, right?
_____________________________
Matt
www.jetcatusa.com
Yep, Matt you missed it the Futaba 9Z series radios have a (non) user adjustable 1 sec. time delay before a pre-set fail-safe condition (position determined by user) is activated. Try it if you don't believe me --- program in up elev. fail-safe condition so you can see the reaction time ---- then just turn off your transmitter !QUOT!notice the 1 sec. time delay before the elev reacts!!
And Gordon ---- sorry to say it but you can't rely on what the JR 10X manual says if you believe there is a 1/4 sec. delay --- or any time delay at all when transmitting in the S mode! Try it and you'll see that fail-safe reaction is INSTANTANEOUS as I said before. This is one of the biggest reasons why Jet Cat designed a time delay feature into their ECU's! If you are transmitting to the older type receivers Z mode you'll notice your fail-safe screen is different --- the user now can program in up to 1 sec. time delay before a pre-set condition happens, i.e. (up elev) etc........ When you switch back to S mode transmission all user input time delay features disappear......
Lee H. DeMary
AMA 36099
PS This has been my biggest grip with JR since the infamous 10X /S mode was introduced-- and JR has never re-written the software. I think it was just a screw up in programing, never to be fixed..... The 10X user has two options for each channel ---- Hold (which everyone uses) ---- or a pre-set fail-safe position but then there is zero time delay before activation! Try it and time the reaction speed speed there is NO time delay!
Have a happy Turkey day ------- Just the facts folks!
