I cannot get Throttle Cut to work properly. Both of the problem planes have the throttle servo reversed, which may be related to the problem. Throttle Cut actually OPENS the throttle, not closes it. Yikes.

When the servo is set for reverse direction, this reversal doesn't seem to map to the THROTTLE CUT function like it does on the 9C. So, when I use THROTTLE CUT, it actually opens the throttle when THROTTLE CUT is ON. It doesn't close it! If I reverse the switch assignment ON/OFF position to fake it out it will close the throttle but it thinks it is doing that in the OFF position. Gee, this is hard to explain. However, when I do this, the IDLE DOWN feature won't work! Seems that IDLE DOWN is programmed to only work when the THROTTLE CUT switch is in the OFF position. When that switch is reversed, IDLE DOWN thinks that it THROTTLE CUT is already in the ON mode and won't operate. I cannot reverse IDLE DOWN and get it to work.

To work around this, until Futaba fixes it, or until somebody can help me what I'm doing wrong, I created a THROTTLE->THROTTLE mix. I never did such a mix before, but I played with the buttons and graphy thing until the throttle did what I wanted, when I wanted it to do it. I made a multipoint LINE mix. I added an extra point so that I could have the THROTTLE CUT only activate while the throttle stick is within the last 3 clicks at idle. I am kind of proud of myself, but kind of annoyed that the THROTTLE CUT function is screwed up when the servo is reversed. Actually, I'm assuming it's because of the reversed servo, but I have not tried any glow planes with non-reversed throttle servos yet. I've got 4 other electrics programmed in, but they don't need a throttle cut function!

Any ideas? Am I just doing someting incredibly stupid? With my 9C these 2 functions are very easy to do.

Well I am not sure why it happens either but on one of my planes it does exactly as you state here. I will have to check to see if I have the throttle servo reversed. I was having the issue yesterday while at the flying field and planned to investigate it this morning. If it is a reversed throttle servo issue then you are further along in the issue then I am. Thanks for the prog. mix solution if worse comes to worse today I will use it. I will post what I find as well.

Robert

FIXED!

You have to use a number lower than 15% to get the throttle cut to actually work. The lower the value, the more it closes the throttle.

setting >15% - Throttle CUT is actually THROTTLE INCREASE, not throttle cut. What were they thinking with this unexplained function?
setting =15% - no action
setting <15% - Throttle cut actually works. Lower numbers increase throw. 0% is the max cut-off.

The default for Throttle Cut is 17%, which looked like it does not move anything. Looking more carefully, with my Hitec RX and servo, which I set up as a test, the servo nudges slightly in the opening direction at 17%. 17% might be the neutral setting with a Futaba RX and servo. Since it didn't do anything much at 17%, I increased the setting to a higher value, like I would on a 9C. The amount of throw increases as you increase the setting to the 50% max value. This gives the appearance that it is working backwards. From my tests, it didn't make a difference if the throttle servo was reversed or not.

Just use a setting below 15% if you want Throttle Cut to actually CUT the throttle! 9% worked in my application.

In hindsight, using 0% and 50% make some sense, just very different philosophy than the 9C. If you think about the end point at the bottom being 0%, then setting it at 0% brings the servo to its endpoint. Setting it at 50% brings it up to 50% up from the endpoint. I'm not sure if this was their intent, but it's how I've rationalized it!

Well I tried your solution today and no go for me. I even tried setting it down to 1 and 0 and lots of tries in between and still when I do Throttle Cut I get a faster idle not throttle kill. Back to the drawing board. Futaba need me to send you my configuration file? What info can I give you to try to solve this problem?

Tekati, are you certain that you have the switch assigned to the correct on/off position and that you don't have any other throttle mixes assigned to that switch, like IDLE DOWN?

Yes positive. Once I found that you can actually press the CENTER DIAL as a momentary switch I started using that for Throttle Cut only. I have another switch that I use for idle down and it was definitely off.

For what it's worth, I'm using the trainer switch on the top rear left. I was thinking about using that center pushbutton like you. I will try it to see if it changes anything.