RunRyder - GV1 Mixture Servo Setup

rrTV-PHOTO

New HD TV

HOME rrTV-PHOTO GALLERIES MY GALLERY HELP-FAQ

myHOME PM pmRR MEMBERS 461 ONLINE 42 EVENTS SEARCH REGISTER START HERE

2 pages [ << < ( 1 ) 2 NEXT >> ]

442 views

POST REPLY

Revolution Models	.	CarbonXtreme	.	Midland Helicopters
	.		.

Radio - Servo - Gyro - Gov - Batt > GV1 Mixture Servo Setup

contact303
Veteran
Location: Netherlands

Really BAD wheather today so I finally get around to play with a mixture servo to use the GV 1 to its full potential ...
Really I have the engine setup right and it flys well
Smokes like hell and I can pitch pump all day long ..
So all is well ...time to try the mixture thingy :O)

I looked this up and found the perfect setup for the sceadu
I will use a HS81 and have also found a nice place to mount it .
I have my DX7 setup for 3 flight modes so Normal ( No GOV) - IDle 1 (gov1750 ) - Idle 2 (gov 1900)

So where i do need some help is the setup menu of the Gv1 regarding mixture settings ..
The manual is very unclear and/or badly translated or indeed its the third possiblilty ..me beeing to dumb :O)
Anyway I marked the carb with a Permanent pen to show position where i fly wiht I guess that has to be the 50% value ??? Does it ??
This position is about 2 3/8 turn out from closed carb.

What i do now in the Gv1 menu?
I did set the MXMD to GOV
TX set to NORMAL on the GV1 the menu MG1 is at 0% and MG9 at 99%
Now i guess thats wrong because it moves the servo in normal mode (gov off) very far to the left (richer) ??
TX set to IDLE 1 (gov ON) the menu shows at thorttle -100% now point MG8 at -74% ?
This moves somewhat according to throttle imput ..but i dont understand how to set this up ...
I have the point reference I am flying with . So really where do i need to plug this number into the equasion here ?

Also i dont understand, when u add throttle ergo add pitch which way should the carb be moved ?
right(leaner) or left (richer) ??

Ahh well

Any ideas greatly appreciated

05-17-2008 11:36 AM

Itsindilas
Veteran
Location: Greece-Athens

Dear mate,

GV1 mixture option could be considered as a "manual smart carb" feature.
Consequently, it should be setup in such a way to maintain engine Temperature in operational limits.

So, for the upper throttle part, it will have to ensure the "in the limits" engine running, and in the lower throttle part you could ensure any carb inconsistencies regarding lean or rich mixture.

Set up is a little bit complicated.

Good Luck

05-17-2008 11:55 AM

contact303
Veteran
Location: Netherlands

Quote
Consequently, it should be setup in such a way to maintain engine Temperature in operational limits.

Right u are ..I have setup the engine so it runs well
It could easy be made a bit leaner hence I thing the position i marked shoudl a a good staring (50%??) Middle point .
The temps are all right and the motor smokes quiet healthy

Your advice however I dont understand fully
Upper limit you mean the MG5 to 9 setting ? and lower rhen Mg1 to 4 ??

And thanks for the help

05-17-2008 12:06 PM

contact303
Veteran
Location: Netherlands

i THINK I have worked it out a bit :O(

But when I moving throttle to 100% the servo moves the Carb to the left (richer)
Does this sound correct ???

05-17-2008 07:15 PM

contact303
Veteran
Location: Netherlands

So realy nooone does know how this GV1 really works or where a decent How to can be found ?

05-18-2008 08:43 AM

tadawson
Key Veteran
Location: Lewisville, TX

From reading the GV-1 manual, it seems pretty clear that you need to go into MDx mode and set the 9 points of the curve that control the mixture in the GV-1 - IE, 9 points along the throttle travel at which you can establish mixture servo values. There is also a mixture servo reverse function, MSx, if the mixture servo needs to be reversed, as well as an ATV value to set mixture servo travel limits. Once this is done, it would appear that the GV-1 will have the mixture servo follow this curve based on what throttle value it is outputting to drive the mix servo.

Have I done this? No - I have never felt the need on my YS motors, but I have found the Futaba manuals to be pretty OK once you learn to read Jinglish . . . .

- Tim

The more I touch electrics, the more I grow to hate them . . . .

05-18-2008 09:00 AM

Itsindilas
Veteran
Location: Greece-Athens

Quote

Your advice however I dont understand fully
Upper limit you mean the MG5 to 9 setting ? and lower rhen Mg1 to 4 ??

Something like that mate. It depends on your engine throttle linkage geometry as well as.

05-18-2008 09:50 AM

contact303
Veteran
Location: Netherlands

So right :O)

Quote
once you learn to read Jinglish . . .

Unfortunately I dont speak Futaba yet ..:O)

I have the curve kinda setup now
Although I feel if u use the full 100% on the 9 points The servo moves far too much for my liking ..
I dont think it will need that much travel ever ...
Surely not 160 deg travel ...??

Also i have not worked out the direction yet ..
So when moving the throttle up should the servo move the carb top richer or leaner ? <------ THIS is really important although maybe a stupid question but I need to know

So really i am asking about the MSx direction function ..which way does it need to turn when trottle goes up ?
richer (left ) or leaner (right)

ON servo direction/throw

Manaul says :

Quote
Mixture servo reverse MSx The direction of operation of the mixture servo can be reversed. (Setting method) 1 Switch the direction by pressing the DATA+ or DATA- key. (Initial value) Norm

And all it says on mixture :

Quote
Mixture ATV ATV Sets the mixture servo throw. Set the operation angle in accordance with the mixture carburetor instruction manual. (Setting method) 1 Operate the throttle stick and select "ATVA" (slow side) or "ATVB" (high side.) 2 Set the steering angle by pressing the DATA+ key (increase) or DATA- key (decrease). (Setting range) 10~140% (Initial value) ATVA100% ATVB100%

Like i said I have marked a point on the carb with which I was flying and it works well !
So really i would think all it wants to do IF necessary move the carb a tiny bit to leaner to get more ummmpf when needed ..AND if this thought is correct then the ATV should be moved MUCH MUCH down from 100% to reduce the throw ..
Maybe iam wrong but NOwhere i can find a setup guide ..but the manual and its useless ...At least I dont get it

..

Now the ATV determins the MGx points i guess (???) 1 to 9
The manual says:

Quote

Mixture rate setting MGx/MDx
Each point of the mixture curve can be set. When the "Gov" mode is set with
the "mixture servo operation mode" function, "MGx" is displayed and when
the "Dir" mode is set with the "mixture servo operation mode" function,
"MDx" is displayed at each point. ("x"shows the number of characters of each
point.) Nine points can be set.
(Setting method)

1 With the governor in the off state,
move the throttle stick to the set
point.

At points other than the set point, "->" or "-<" is displayed to
indicate the direction of offset from the set point.
When the set point is reached, the rate display changes from
flashing to a steady light to show that setting is possible.

What please in plain English does the BOLD parts tell us ?

Well I hope i will work it out eventually but really I though there be more info to be found as the GV1 was popular a while back and many many pilots used one
Yet to find a setup including Mixture servo is almost impossible

and of course a BIG Thanks to all the guys for the help ...

05-18-2008 10:55 AM

tadawson
Key Veteran
Location: Lewisville, TX

Quote
Your advice however I dont understand fully Upper limit you mean the MG5 to 9 setting ? and lower rhen Mg1 to 4 ??

No, looks like ATVa and ATVb set the limits - the MGx values are the curve . . .

- Tim

The more I touch electrics, the more I grow to hate them . . . .

05-18-2008 06:28 PM

tadawson
Key Veteran
Location: Lewisville, TX

Quote
So when moving the throttle up should the servo move the carb top richer or leaner ?

Depends on your engine, and what it's mixture needs are, as well as what servo you used - Futaba is reversed from some others. This one you need to figure out for yourself based on your engines needs.

Quote
1 With the governor in the off state, move the throttle stick to the set point.

As I read that, it means to move the throttle stick to select the MGx/MDx point that you want to select - the mix *is* throttle to mixture after all, so you need to select a throttle point for which you are setting the mixture curve. The comment about "at points other than the set point" indicates that the screen will show the <- or -> if you are above or below one of the curve points - they are fixed, and you need to hit them directly to set them. The difference in MGx and MDx would appear to be that in MGx mode, you set the points with the buttons on the GV-1, and in MDx, it takes the value from your radio through the aux line.

- Tim

The more I touch electrics, the more I grow to hate them . . . .

05-18-2008 06:33 PM

contact303
Veteran
Location: Netherlands

@ tadawson
Yes i believe ur right there
I just dont believe the range ATV should be a total of 160 deg travel because thats what it is round about when default ATVA100 and ATVB100

@tadawson

for MGx/MDx THANKS i think i got it ..
what i still dont get is the DEFAULT for servo direction
So when moving the throttle up in NORMAL the serevo moves the arm to leaner ...or richer ??
That really is still the question
This has i am affraid nothing to do with

Quote
what it's mixture needs are

As there must be one way it expect to be working in default ..

Leaner would be turning right to close the carb and richer would be left to open the carb more ..
As i dont know if the servo reverse function should be Normal of reversed i still dont know what the deafaul on the GV1 should be !

but really can it be noone ever used the mixture servo on a GY??

and Thanks guys for all the input ...

05-18-2008 06:43 PM

tadawson
Key Veteran
Location: Lewisville, TX

Quote
So when moving the throttle up in NORMAL the serevo moves the arm to leaner ...or richer ??

Still depends on the carb, servo, and installation . . . . Bottom line is that it moves in the direction that the curve that YOU loaded into the GV-1 tells it to move. Period. I doubt that they had any particular direction in mind when they came up with the GV-1 mix functions. I think the goal is to have the throttle to mix curve that let's you put it where you want it, but you have to know where that is going in ahead of time. So on that one, I can't help you . . .

As far as the ATV, once again, it is all setup/installation/servo/etc. dependent, so they logically gave the unit a large range and the ability for the user to reduce it if need be. Otherwise, you could be screwed . . .

If you are looking for an "out of the box" mixture control setup on the GV-1, I don't think you will find it . . . it's a tool that must be configured by the end user to be of value, and not a "drop-in" . . .
and I think you have discovered why you don't find many folks using it - it's not that it doesn't work, it's just very fiddly to get setup in a useful way.

- Tim

The more I touch electrics, the more I grow to hate them . . . .

05-18-2008 07:25 PM

contact303
Veteran
Location: Netherlands

Thanks Tim

I will greatly reduce the ATV then i will have the 1st 4 MG point at the same value and move Carb a little Leaner (to the right) a when full pitch/throttle is given ..
My engine it running on the rich side and running real fine ..
The carb is almost 2 3/8 turn out from closed and it flew very well so I d say thats a rich setting
I dont want any richer at no point and will try only a bit leaner at full pitch/throttel and see if it makes any difference ..
For this i will for starters dial the G1 ATV setting quiet a bit down.

Well its all for the same money and i like to tinker :O)

05-18-2008 07:44 PM

tadawson
Key Veteran
Location: Lewisville, TX

Can't argue there - I like to tinker with stuff as well, but once I went to YS engines, have not had any mixture issues that I felt needed to be dealt with, and the extra servo is just more weight in the air, so never went there.

Let us know how it works out . . .

- Tim

The more I touch electrics, the more I grow to hate them . . . .

05-18-2008 07:45 PM

contact303
Veteran
Location: Netherlands

Well heres the settings i got now
Makes it move only slightly at max throttle to the leaner side

I ll let you knwo how that feels and flys

Idle

max throttle

Oh and the weight of an extra HS81 really dont bother me ..
I dont 3d :O)

05-18-2008 09:27 PM

Jesmond
New Heliman
Location: Marsa, Malta

Does the mixture on the GV 1 is controlled automatically or I need to set the mixture from the radio?

I have the Gv 1 on my Trex 600 but sorry I don't know how the mixture works.

06-14-2008 05:23 PM

tadawson
Key Veteran
Location: Lewisville, TX

It works based on a curve that you program into the GV-1, so it adjusts the mix based on the throttle servo position, according to the curve.

- Tim

The more I touch electrics, the more I grow to hate them . . . .

06-14-2008 05:46 PM

Jesmond
New Heliman
Location: Marsa, Malta

I see.So I don't need to do something from the radio? Cause I have only 7 channel radio.

06-14-2008 05:54 PM

tadawson
Key Veteran
Location: Lewisville, TX

Nope. If you can run a GV-1 without the mixture feature OK, you can also run it with it enabled. There is a provision to use a spare channel to fine tune the mixture, IIRC, but it's use is not mandatory.

- Tim

The more I touch electrics, the more I grow to hate them . . . .

06-14-2008 06:56 PM

Jesmond
New Heliman
Location: Marsa, Malta

Yes currently I am using the GV1 with 3 switch position. What are the settings on GV1 to control the mixture? I ordered the servo plate for the T-rex.

06-14-2008 07:39 PM

2 pages [ << < ( 1 ) 2 NEXT >> ]

442 views

POST REPLY

HeliProz	.	ZoomsHobbies	.	HeliHobby
	.		.

Radio - Servo - Gyro - Gov - Batt > GV1 Mixture Servo Setup

UPDATE SCREEN PRINT TOPIC

Advertisers

Subscribe to This Topic