RunRyder - Mixture control assignment to a knob

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Radio - Servo - Gyro - Gov - Batt > Mixture control assignment to a knob

Tyler
Key Veteran
Location: Chicagoland area

How do I assign a servo to adjust the high speed needle on a carb by turning a knob on the 8103 heli version radio? I have the servo plugged into aux 2, but I cannot seem to figure out how to get the servo to do more than act like a retract servo with an up and down position. I want a linear adjustment.

I have tried working with the aux 2 input selection set to inhibit and also set to pitch knob. No luck.

I am totally stumped and after spending well over an hour on this problem, I am highly frustrated.

Thanks,
Tyler

Airtronics, YS Power, Switchglo ignitors, Jersey Modeler filled with Magnum

08-12-2002 Over year old.

the Wasp
rrProfessor
Location: Vt

Mixing

Try using your mixing,,, use your throttle servo as the master servo and the remote as the slave,,, adjust the slave's throw (end points) to just a little !!, and then adjust it as you fly, as you need leaning or richer !! I have done this with my boats (mixing and manually), it takes some adjusting though !! the slave's end point is what you need to look at !!

08-12-2002 Over year old.

Tyler
Key Veteran
Location: Chicagoland area

Hi Wasp,

If I set it up using your suggestion, won't the mixture servo move evertime I add throttle? I don't want the mixture to be adjusted as I increase or decrease the throttle stick. I want to turn a knob to tweak the needle valve a click or two as needed. The control knob should be isolated from any stick inputs if possible.

For example, as my tank depleates, the engine goes slightly lean. Rather than having to land the heli and adjust the mixture, I want to turn the knob on the face of my radio to +/- a few clicks on the carb.

Surely this can be done, and hopefully with an 8103!

Thanks again,
Tyler

Airtronics, YS Power, Switchglo ignitors, Jersey Modeler filled with Magnum

08-12-2002 Over year old.

the Wasp
rrProfessor
Location: Vt

I don't think you can do it the way you want to !!

Jim

08-14-2002 Over year old.

ScottG
Veteran
Location: Ft Wayne, Indiana

Tyler,

Try this. find the section in the manual that shows how to assign the AUX 2 (channel7) to the pitch trim knob. If I'm correct, to have the knob work for pitch trim it has to be selected for INH. By selecting PITCH TRIM KNOB, you are telling the radio you want the "pitch trim knob to control AUX2(channel 7) as a proportional channel by moving the knob. I'm thinking this will give you the fine tuning adjustment function that you want. Let me know if this works.

Scott

08-14-2002 Over year old.

Tyler
Key Veteran
Location: Chicagoland area

g257945,

I have tried what you suggested, and the pitch trim knob doesn't control the channel 7 (Aux 2) proportionately. I also called Horizon tech support, and they said it was impossible to get the 8103 to do what I was hoping for. I must say that I am very dissapointed that a $630 radio system doesn't allow me to use a knob to operate a mixture servo.

I have known tech support to be wrong before, so if anyone else has successfully found a way to do this, please let me know.

I do have a Futaba GV-1 which has some sort of in-flight mixture control, but I believe this works like a throttle curve (5point). When the throttle stick is at each of the 5 points, the governor moves a servo to a preset mixture setting. This can allow the engine to run richer or leaner at each of the 5 points, but it is slaved to the throttle stick at all times. From what I understand, I cannot manually tweak the mixture while in flight with a knob to accomodate a lean tendency as the tank depletes. Have I interpreted this function properly?

Tyler

Airtronics, YS Power, Switchglo ignitors, Jersey Modeler filled with Magnum

08-14-2002 Over year old.

ScottG
Veteran
Location: Ft Wayne, Indiana

Tyler,

If I get a chance tonight I'll look at this problem on my 8103 and see if some combo of mixing will work. I'll get back to you on it.

Scott

08-14-2002 Over year old.

IMZ Caliber
Senior Heliman
Location: Chesapeake, VA USA

mixing with a curve

well as far as not being able to use a mix to get it to a knob like you would like i can't help you with that. However since I actually use an active mix carburator i can tell you that it can still be applicable to use a p-mix for thro to mix servo because i haven't seen a perfect carburator out there yet. For the most part just about every carburator will have a lean or rich spot somewhere. So you may not want to throw out the idea of having an actual mixture curve.

I will try to make an attempt as to why the 8103 will not allow you mix it to a knob, I'm not claiming this reason to be a fact though. In heli mode the 2 knobs are assigned to HP and HT. you can inhibit those functions however that does not change the actual function that was assigned to them. I guess thats because JR doesn't really believe in assignable switches. At least that is how it worked with a 8U super. Fortunately on that radio we had a 3rd knob that was assigned to channel 8. Sorry that i didn't have much to offer.

08-14-2002 Over year old.

ScottG
Veteran
Location: Ft Wayne, Indiana

OK Tyler,

Here's the scoop. Assumeing you are using the heli version of the 8103, look on page 72 of the manual. Go into the setup mode and into the input select function. Change the assignment to "pit.trim" and shut off the tx. Turn it back on and if you have a servo pluged into the AUX2 slot in the rx, the pit.trim knob on the left front of the tx should give you a proportional movement on the servo. I just did it to mine and it does work. Goes to show ya that those snobs at JR only tell ya what that feel like saying whether they know or not. Let me know haw you make out.

Scott

08-15-2002 Over year old.

Tyler
Key Veteran
Location: Chicagoland area

Hi Scott,

I tried everything exactly like you just described, but I didn't turn off the radio to save the changes. I simply pushed both buttons to exit the menu and tried the knob. No go. I will go give it a try using your method. I will report back shortly.

Thanks Scott,
Tyler

Airtronics, YS Power, Switchglo ignitors, Jersey Modeler filled with Magnum

08-15-2002 Over year old.

Tyler
Key Veteran
Location: Chicagoland area

Scott,

I just tried my radio again, and it doesn't work. My rudder switch will make the Aux 2 servo move left all the way and right all the way, but nothing in between proportionately. My pitch knob on the left face of the tx doesn't control the Aux. 2 servo. I am still lost. Any more ideas?

Tyler

Airtronics, YS Power, Switchglo ignitors, Jersey Modeler filled with Magnum

08-15-2002 Over year old.

Tyler
Key Veteran
Location: Chicagoland area

I got it!

I finally figured it out, well actually my buddy JEraptor solved the quest. The gyro sensitivity screen must be inhibited in order for the pitch knob to operate the mixture servo (aux.2). I am going to plug my GY-401 gain into my gear channel and switch between HH and standard mode using the gear switch instead of the idle switch or rudder dual rate switch. I will then try to adjust the gyro gain using the ATV screen for the gear channel.

If you see any potential problems with this set up, please point them out before I turn my two new 60 machines into smoking craters!!

Tyler

Airtronics, YS Power, Switchglo ignitors, Jersey Modeler filled with Magnum

08-15-2002 Over year old.

ScottG
Veteran
Location: Ft Wayne, Indiana

I don't see anyother problems at this time. As long as you don't have any problems switching to the gear channel for gyro mode changes, you should be good to go. Have you tried to use the "AUTO" function for switching gyro modes with the flight mode switch? Just one less thing to have to think about while flying. Glad to hear that you can now use in flight mix control. I just might have to give that a try myself.

Scott

08-15-2002 Over year old.

JEraptor
Senior Heliman
Location: Kankakee IL

Gyro

The problem with leaving the gyro mode functional either as D/R or Auto is that the gyro gain signal goes to Aux 2, and Aux 2 seems to be the ONLY channel that can be controlled with the knob, so we are now using the gear channel for gyro.

08-15-2002 Over year old.

ScottG
Veteran
Location: Ft Wayne, Indiana

Just wondering here, but why does Tyler need to switch from one gyro mode to the other?

Scott

08-15-2002 Over year old.

JEraptor
Senior Heliman
Location: Kankakee IL

I beleive the idea is to have the gyro available in normal mode or HH mode.
But even if he only needs 1 preset gain, it still must be plugged into a channel. And if the mixture servo is occupying aux 2 (which is normally gyro channel) we must find a new channel to plug the gyro into.

08-16-2002 Over year old.

Tyler
Key Veteran
Location: Chicagoland area

Successful test flight

I was able to fly the heli today with the new mixture control. How cool! I can effectively get about a 10 click adjustment from the transmitter. Right now I am running my new engine so rich that 10 clicks does not get it lean enough to notice a real power increase, but as I get the engine closer to the proper needle setting for power, I am sure 2-3 clicks will eventually be all I need from the system to "tweak" the perfect mixture.

Reaching up to adjust the knob was actually a little easier and more natural than I expected. I think it is helpful having the knob on the face of the radio assigned to this function.

Also, the gyro works fine.

Give it a try. I was tired of landing, spooling down, walking out to the machine after calling "on the field", adjusting one click, flying around a few seconds, and repeating the whole process all over again. It seems that only 2-3 clicks is all that I ever needed during the day. Even as the weather would change, one click here and there was needed. Perhaps switching from OS to YS would eliminate the minor tweaking all the time, but this was a cost free option.

Tyler

Airtronics, YS Power, Switchglo ignitors, Jersey Modeler filled with Magnum

08-16-2002 Over year old.

ScottG
Veteran
Location: Ft Wayne, Indiana

Just a note from one that knows, NEVER forget to check any "knob"
settings before you throttle up. They can be bumped out of adjustment too easy from handleing the tx. Make it a habit to look at them each flight....Glad to hear it's working out for you Tyler.

Scott

08-16-2002 Over year old.

rcpylon
Senior Heliman
Location: Saltillo, MS

"Just a note from one that knows, NEVER forget to check any "knob"
settings before you throttle up. "

on that note, how about using sub-trim, granted you would have to push a few buttons but you also wouldn't have to worry about it once its set...just a pondering...

-------------------------
Alan Warfield
-------------------------

08-16-2002 Over year old.

mike lewis
Senior Heliman
Location: northeastern AZ

How to assign

I have been following your post with much interest. I two have an 8103 H and would like to know just how do you assign the switch to controll the servo that is now used for the mixture controll in AUX 2 I am very new to the radio and don't understand it yet. Thanks Mike michaellewis@frontiernet.net

08-19-2002 Over year old.

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Radio - Servo - Gyro - Gov - Batt > Mixture control assignment to a knob

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