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HomeRC & PowerAircraftHelicopterRadio - Futaba FASST › CGY750 Cant get governor to work
04-20-2011 02:08 AM  7 years agoPost 1
Charlie R

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Lafayette Ca

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CGY750 Cant get governor to work .
14mz ,700n . Set gear rt 8.12
Sensor shows 96 % and after flight you can go and see the maximum rpm ,so I don't think the sensor is the problem .
On the radio when you set the gov ( lower right of governor screen ) 1000rpm ,1500rpm and 2000 shows 1,2,3 on the CGY750 and # match . In normal ( rate 1) on radio it shows the correct rpm on the 750 but has the #2 next to it . In Ideal up #1 on radio ( rate 2 ) the 750 shows the correct rpm with the #3 next to it . Stick switch is set to come on at 30% (as pg 72 shows ) in normal and you can see it turn on ,on the 750 .Ideal up 1 is turned on by switch SW-E and it show it is on ( both on radio and 750 )when you flip the switch .
If you know what I am doing wrong please let me know .
Thanks Charlie R

Helicopters are a mass of rotating metal fatigue surrounding an oil leak !

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04-20-2011 02:28 AM  7 years agoPost 2
Dr.Ben

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Richmond, VA, USA

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You set the throttle high and low limits, right?

I presume you mean you set the gear ratio to 8.2:1.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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04-20-2011 03:08 AM  7 years agoPost 3
Charlie R

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Lafayette Ca

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Yes, Any other advice Dr Ben ?

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04-20-2011 03:45 AM  7 years agoPost 4
Dr.Ben

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Richmond, VA, USA

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So it won't come on/regulate RPM at all?

Ben

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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04-20-2011 03:55 AM  7 years agoPost 5
Carey Shurley

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Orlando, FL - USA

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which sensor are you using?

as a test, have you tried using it rev-limiter mode?

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04-20-2011 04:16 AM  7 years agoPost 6
Wyorcflyer

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Cheyenne, Wyoming USA

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In normal ( rate 1) on radio it shows the correct rpm on the 750 but has the #2 next to it . In Ideal up #1 on radio ( rate 2 ) the 750 shows the correct rpm with the #3 next to it .
What we need to know are the RPM settings that you have set in the transmitter in Normal and Idle 1? The number 1, 2, and 3 in the top right corner of the 750 relate to the RPM ranges of the 750 and are not related to your condition switch, normal, idle 1 idle 2, idle 3 etc.

The CGY750 has three RPM ranges 1 is < 1400 RPM range 2 is 1400 to 1700 RPM and range 3 is > 1700 rpm.

That is why you need to calibrate each range.

What can be confusing is the result when you set the RPMs that you actually want to fly after you are done with the calibration. If all the RPMs you set are above 1700 then a 3 will always appear in the top right corner because all of those values are above 1700 regardless of the mode, Normal, Idle 1, etc.

In your case you must have an RPM in normal between 1400 and 1700 RPM which is in range 2 so that is why your 750 shows a 2. In Idle 1 you must have an RPM set that is above 1700 RPM which would be in range 3 and therefore your 750 shows range 3.

If the above is true then you have done everything right.

That leads back to Ben's question, have you tried it? If the governor never engages I would inhibit the on/off switch function in the 750 and simply use the stickswitch and try again.

Jack

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04-20-2011 09:57 PM  7 years agoPost 7
Charlie R

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Lafayette Ca

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Wyorcflyer & Dr Ben
You are correct about the #1,2,3 I did not realize this before and feel stupid .
And the governor never engages , so I did inhibit the on/off switch function in the 750 . Know the stick switch function is working in normal and in ideal up ( at least in my small driveway where I can only hover ) . Ideal up set to 1,550 and CGY750 shows1775 Mrpm . Servo is Futaba S9252 set DG:1520 .All # match radio and 750 . Is there any problem flying in ideal up with the stick switch !
Another ? On The 14MZ on the governor screen do you have it set to Gr or Sngl on the flight modes ?
The tail is the best part of the 750 it never lets go!
Any other Good ideas ?
Thanks for taking the time to help me
Charlie R

Helicopters are a mass of rotating metal fatigue surrounding an oil leak !

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04-20-2011 11:46 PM  7 years agoPost 8
Wyorcflyer

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Cheyenne, Wyoming USA

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Is there any problem flying in ideal up with the stick switch !
You can fly in any mode with the stickswitch active. Make sure however that you have your throttle curve set above your stickswitch throttle cutoff level in any flight mode in which you want to fly inverted. i.e. throttle curve 65-50-65 or whatever floats your boat. If you don't do that when you go inverted and pull the stick back the Gov will disengage.

Because I am human and can and do make every mistake imaginable, I cap the pitch curve in normal mode so the heli will barely hover. That way I won't forget to switch to a 3D mode and flip the heli over in normal mode and have the motor go to idle one foot off the ground, ............... again!

I will let Ben address your question on the 14MZ. I think you will want single so you can change the RPM in each mode. I use a dedicated switch for RPM, not the Idle up switch so I can't be sure on that one.

Jack

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04-20-2011 11:49 PM  7 years agoPost 9
Carey Shurley

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Orlando, FL - USA

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so are you using the stock Futaba governor sensor or something else?

you indicated that it would not govern, have you tried having it limit instead?

knowing these answers will help narrow down the possibilities.

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04-21-2011 01:02 AM  7 years agoPost 10
Dr.Ben

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Richmond, VA, USA

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Charlie,

Do the initial calibration of the governor in group mode, then switch it over to single so you'll have unique control of rpm in each of your flight conditions. Alternatively, you could have have HOVER in SINGLE for a lower rpm, and then keep your IDLE UPS GROUPED if they are all going to be the same higher RPM.

There is no issue at all with using stick switching as long as you follow the simple throttle curve rules for idle up that Jack outlined in his reply. Get it all set up for stick switching only and see if it works for you. I'll presume you've been using the included CGY750 sensor as well.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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04-21-2011 04:35 AM  7 years agoPost 11
Charlie R

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Lafayette Ca

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Thanks for your help .
I am NOT using the Futaba sensor .I'm using Spekrum sensor with a HeliProz south AFX001GV1 adapter .I will be able go play with it on Friday at the flying field .

Charlie

Helicopters are a mass of rotating metal fatigue surrounding an oil leak !

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04-21-2011 04:38 AM  7 years agoPost 12
Dr.Ben

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Richmond, VA, USA

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Though the 750 will work with aftermarket back plate set ups, all bets are off for any other cause for the system not working besides that.

Ben

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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04-21-2011 04:44 AM  7 years agoPost 13
Wyorcflyer

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Cheyenne, Wyoming USA

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Sensor shows 96 %
You would think that if the 750 is showing 96% that it is indeed reading the sensor.

Does the % drop as you turn the drive system or does it stay stuck on 96%???. I seem to remember that my GV-1 stayed on a high number with a bad sensor.

Jack

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04-21-2011 11:10 AM  7 years agoPost 14
Carey Shurley

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Orlando, FL - USA

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the reason I keep asking about the sensor, is that when the 701 first came out, I spent a LOT of time trying to understand why the governor was misbehaving on my model. I was using another vendors sensor on a gasoline motor.

the max sensor reading was always above the minimum and it would usually provide a running RPM and a MAX rpm.................but turned out there was an issue with this sensor when trying to use it with the 701/750 and the governor simply wouldn't work properly. The vendor came up with a fix and now it works fine.

In my case it would sort of work with the limiter which is why I'm suggesting you try it there.

There are differences in line voltage between the GV1 and the 701/750. If that sensor has any sort of power requirement you probably just found the problem.

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04-21-2011 11:00 PM  7 years agoPost 15
Charlie R

rrApprentice

Lafayette Ca

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OK ,I put the Futaba sensor on the 700 it works but still the head speed are off set for 1,750 on radio but 750 says 1865mrpm .
I will try the rev-limiter mode tomorrow .
Thanks everyone for all your help .
Charlie

Helicopters are a mass of rotating metal fatigue surrounding an oil leak !

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05-11-2011 09:36 PM  7 years agoPost 16
Steve Evans

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United Kingdom

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Hi Charlie,

You can calibrate the CGY750's gov setting. With your radio set to 1750, when the CGY750 displays 1865, simple press the '-' on the CGY750 and you'll see that the number changes. Set it to 1750 and you're sorted.

Steve

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05-12-2011 05:49 PM  7 years agoPost 17
Charlie R

rrApprentice

Lafayette Ca

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Steve
The #'s on the radio and the CGY750 match . After a flight if I go to the CGY750 and cheak the mrpm screen it showes the max head speed to be about 100rpm higher than the set head speed ,witch is ok but not as close as the GV1 was .
Thanks Charlie

Helicopters are a mass of rotating metal fatigue surrounding an oil leak !

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05-15-2011 10:40 PM  7 years agoPost 18
Steve Evans

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United Kingdom

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I'm using the CGY750 on my 500ESP, using the gov by fitting magnets to the auto-rotation gear.

The head clearly overspeeds on spool up but then settles down. I think this is a "feature"!

Steve

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03-19-2013 02:47 AM  5 years agoPost 19
hootowl

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Garnet Valley, Pa.

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I'm learning one of these right now. The instructions suck from Futaba as usual. Thank Dr Ben and others because without them we would be lost if we depended on documentation. I was also totally confused with those 1,2,3 numbers on the 750 for the gov. I didn't see any mention of what they stood for in the manual so yea we assume they should be following conditions.

I had a really hard time figuring this thing out... funny how all of the videos and "advertisements" say how simple it is. Maybe so but couple it with a 12Z and you are spending some serious time pushing buttons. I had a heck of a time getting or figuring out the stick switch. Kept fiddling back and forth with the "Switch" on/off setting and the Stick:sw setting. Couple of times it looked like it should have been working but the gov "on" would not come on in the home menu. Had to redo a few times without really changing anything. There seems to be a special sequence required?

I think I got everything in order. Used Logic to set a switch for trim, normal setting elev and ail.

Also got the gov to read true/display rpm on the 12Z. I like it!

What initial gains should I use on a Fury 55?

How do I know the firmware revision level of my unit?

Wolves don't lose sleep over the opinions of sheep

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03-19-2013 03:14 AM  5 years agoPost 20
dchekas

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Farmington, CT

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Hi hootowl.

I've fiddled with the On/Off thing in the past. I wound up just inhibiting it. It's a pain getting it to behave the way we typically want it to work.

I'd start per the 1.31 instructions. Gain on Ail/Elev at 60% and work your way up from there.

Turn the unit on while leaving your radio off, and it will display firmware version.

Team Align, Team Futaba, Team Byron Fuels, Team Thunder Power

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HomeRC & PowerAircraftHelicopterRadio - Futaba FASST › CGY750 Cant get governor to work
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