Throttle cut on a JR X9303 2.4 ?

[chosen69]

How would you program a throttle cut switch on the 9303 ? I'm using the gear channel for my multigov and the rudder D/R is used for the gyro to switch between rate and HH. Can I still prgramm a throttle cut on the gear switch which is not used because the governor speeds are linked to the flightmode switch ? Thx for your help !!

[WayneBrown]

Ask a question to a question..
Why do you feel you need throttle cut?
The 9303 has a mechanical throttle trim instead of the digital trim so you can kill the engine with that quicker than waiting on a digital trim to scroll down.

[chosen69]

Wayne, I would like to have a throttle cut switch because my throttle trim is not exactly at the zero position after tuning the engine to a good idle, so instead of having to always readjust or memorize the exact position of the trim I would prefer to just flip a switch to kill the engine, which by the way, would prevent me as well from binding the servo.

[chosen69]

I found a way to do it after playing around for a while with the mixes, but I'm not absolutely sure if I'm screwing up something else, so here it is: I'm using Mix 6 and set the gear channel as master on the left side and the throttle as slave on the right. Then theres a POS 0 and a POS 1 option with each a lower and higher value. So I set the lower (geographically) value on the POS 1 option to whatever is required to close the throttle from idle i .e +15%. Last I activate the POS 1 position on the GER (gear) switch below. I don't use any offset value. This seems to work.

I'm just not sure as I said if this influences the governor in any way because I have the rpm control plugged into the gear channel. However, observing the servo monitor it doesn't seem to effect the gear channel which still seems to output 100 / 0 / 100 according to my flightmode switch setting. Can anyone comment on that with a little more mix - programming experience ?? BTW sorry for posting this here in the Trex section but I thought mybe more people would like to know ?

[Anthony.L]

If you setup your throttle trim properly you can use the slider to cut the engine every time without binding the servo. That's why it's a mechanical slider and not digital like the DX7.

[chosen69]

If you setup your throttle trim properly you can use the slider to cut the engine every time without binding the servo. That's why it's a mechanical slider and not digital like the DX7.

Hi Anthony,
I know that, but as I said my throttle trim is not exactly at the zero position when in idle, so I would always have to remember the exact position of the the throttle trim before when shutting down the engine or adjust the idle trim when starting the engine again...

[invertmast]

Hi Anthony,
I know that, but as I said my throttle trim is not exactly at the zero position when in idle, so I would always have to remember the exact position of the the throttle trim before when shutting down the engine or adjust the idle trim when starting the engine again...

not if you use a fine tip sharpie to put a "index" mark beside the trim slider. I vaguely remember the 10X i used to have, had a trim position saving feature so when u changed between models, u could set your throttle trim for the new model to the exact position.. Not sure if the 9303 has this or not.

[chosen69]

not if you use a fine tip sharpie to put a "index" mark beside the trim slider. I vaguely remember the 10X i used to have, had a trim position saving feature so when u changed between models, u could set your throttle trim for the new model to the exact position.. Not sure if the 9303 has this or not.

To my knowledge there's no feature like that on th 9303, anyhow I would prefer having a switch instead of painting mark on my transmitter, eventhough I agree with you guy's that it's obviously not absolutely necessary to have one. My questions was if it IS possible on the 9303 to program one ?

[N11634]

If you're over-driving your servo with throttle trim, you set your throttle linkage up incorrectly. My advice to you is to start over on your throttle linkage. If you prefer having a switch to your throttle trim, then you shouldn't have bought a 9303. Otherwise, I guess you could do a throttle mix on one of the unused switches, but either way, the 9303 won't over-drive a servo once the correct endpoints are used...so really, if you set your end points up correctly you could the use the throttle trim for your engine cut.

[sbmon]

The issue I don't like on the 9303 is that even if you do program a throttle cut switch it can not be used while in throttle hold, heck even trimming down to kill the motor must be done while out of throttle hold (which is bad if you end your flights with autos while in idle up mode you throw throttle hold, common practice for many). I know people will say that this prohibits you from accidentally hitting throttle cut while in the air but I think it is safer practice to have a throttle cut switch that overides all other flight mode/throttle hold functions.
shawn

[chosen69]

If you're over-driving your servo with throttle trim, you set your throttle linkage up incorrectly. My advice to you is to start over on your throttle linkage. If you prefer having a switch to your throttle trim, then you shouldn't have bought a 9303. Otherwise, I guess you could do a throttle mix on one of the unused switches, but either way, the 9303 won't over-drive a servo once the correct endpoints are used...so really, if you set your end points up correctly you could the use the throttle trim for your engine cut.

Maybe I'm not making myself clear: I am totally aware that it is possible to cut the throttle with the analog trim and that, if the linkage / transmitter setup is right, you won't have binding on the throttle servo, but STILL would like to know how to program one on the X9303 to avoid making a mark on my transmitter or having to adjust my trim again every flight (even though it's probably just a small amount) !!
BTW: the trim will always go beyond your set endpoints !

The only way you can avoid overdriving your throttle servo is by setting it up with the throttle all the way down plus throttle trim all the way down and then make sure that the carb is fully closed which should give you, with the trim back to the middle position, a fairly good idle setting in theory. But only in theory.

[chosen69]

The issue I don't like on the 9303 is that even if you do program a throttle cut switch it can not be used while in throttle hold, heck even trimming down to kill the motor must be done while out of throttle hold (which is bad if you end your flights with autos while in idle up mode you throw throttle hold, common practice for many). I know people will say that this prohibits you from accidentally hitting throttle cut while in the air but I think it is safer practice to have a throttle cut switch that overides all other flight mode/throttle hold functions.
shawn

The way I programed it you would be able to have a throttle cut switch eventhough throttle hold is selected.

[N11634]

BTW: the trim will always go beyond your set endpoints !

The only way you can avoid overdriving your throttle servo is by setting it up with the throttle all the way down plus throttle trim all the way down ......

Man, I hope I'm not offending you. It's the farthest from my intentions. In the quote above, you showed me you know how to set your endpoints up (with the trim all the way down), and with that method, my idle is at about 1/4 trim. As we all know, the idle can and will change with weather conditions, so this is also a non-issue.
I apologize for not seeing why one would want to even do this. You most likely bought/upgraded to the X9303 to move onto spread spectrum and now want it to be like your old radio. Unfortunately, you may have to get used to a new radio. Good luck getting it how you want it. I love my X9303, but I had an 8103 prevously, so there's not a ton of difference.

[chosen69]

Not offended at all !! I just tought it was funny that everyone tried to help me set my trims right while all I was tryin to find out was how to program a throttle cut switch :-)))) But I really appreciate everyone's help which I love about HF's ! Everyone is trying to help !

But still there's no answer to my question...! :-))

[Magnazan]

Sucks that the x9303 doesn't have TC. I'm using the DSX9 which has Throttle Cut in the THRO TRIM menu. Just quickly looking through the mixes and can't see why you wouldn't be able to setup a mix on say Gear -> Throttle. Assuming obviously you:

A) don't use gear (Can use another switch though) for anything
B) At 0% throttle in the radio actually is fully closed on the carb.

Coming from a 9c i have to say i do love the mixes available on the DSX9 :)

[chosen69]

Sucks that the x9303 doesn't have TC. I'm using the DSX9 which has Throttle Cut in the THRO TRIM menu. Just quickly looking through the mixes and can't see why you wouldn't be able to setup a mix on say Gear -> Throttle. Assuming obviously you:

A) don't use gear (Can use another switch though) for anything
B) At 0% throttle in the radio actually is fully closed on the carb.

Coming from a 9c i have to say i do love the mixes available on the DSX9 :)

OK, here's the question: I'm using the gear channel for my governer rpm control but I still seem to be able to use the gear switch as a throttle cut, will I run into any problems from your experience ?

[chosen69]

test

[Bobbyk]

Bob used the mixes to do a throttle cut but it was for the DX7 (I don't think that will be far off than the X9303), he has a video on the T600N build videos and it was set to the gear switch to cut the throttle, yes you can't use it if you're in throttle hold (you get to live with it).

The gov was set to flight modes on aux ch. and the gyro was set up on gear using the flight modes, no conflicts on channels.

This is how I have mine set and it's working very well for me.

Good luck

Robert

[brunsflyer]

set your throttle trim center before you set your GV-1. Use low trim to cut your engine. That is what i use on my 9303.

[rollin1inpa]

I setup mine with mix 6 after seeing what you did only mine does not function with the throttle hold on. Are you sure that it works on yours? I don't think that it's a big deal if it doesn't work with the hold on but was just curious if you knew. Thanks for the help I've been trying to figure this out for a few days.