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HomeAircraftHelicopterGasser Model RC HelicoptersEngines › Futaba CGY750 Zenoah 29cc, Stator Gator governor setup issues
06-08-2018 02:30 PM  6 months agoPost 1
ayhab

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Mississauga, ON - Canada

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Hi all,
I need help with this setup. I’ve got a 14sg that i’m using. I’ve always flown futaba units but i’m having issues setting up the governor for this gasser engine. Any advice is greatly appreciated. Right now I can get the Heli into a hover, but the RPM is really high. How can I test out the stator gator? Also, what settings do I need in the cgy750 governor basic and advanced menus? It’s currently set to Nitro and 2 pole, is this correct? What percentage should I be reading in the rev. Sens screen?
Thanks in advance!

summer is here, its flying time!

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06-08-2018 04:40 PM  6 months agoPost 2
RM3

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Killeen, Texas - USA

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This happened to me when I first went to the CGY701 then the CGY750...

First of all the stator gator does not work with the CGY701 or 750 without
modifying the input wire to the units sens input. Its best you use the provided sensor and hookup to the flywheel or even the main gear and set the gear ratio in settings to match.

You have to go into the advanced menus and set the Low Limit at Idle Up and Low Limit at Hovering ... if its too high, when the gov kicks in, it will raise the minimum throttle position, often higher than the RPM set point you set up.

Read Dr Bens Post here: https://rc.runryder.com/t654213p1/

Dr Ben is the resident expert on the CGY750.

as for What percentage should you be reading in the rev. Sens screen... thats should be over 90 to be safe, Ive run it as low as 80 and it was ok... every time the magnet passes by the sensor its telling you how much saturation the sensor is picking up, but if your using a modded stator gator, it only maxes out when reading (98%) basically on and off.

showing a preference will only get you into trouble, 90% of everything is crap...

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06-16-2018 11:05 PM  6 months agoPost 3
classic

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That is totally false about the stator gator. The input wire does not need to be modified to work with the 701 or 750.
The red power wire from output plug {servo wire from the stator gator} does however need to be taken out of the plug and plugged into a different power source like an empty servo slot on your receiver.
The reason is the 750 power output for the sensor is less the 3v and the gator needs at least 4v or higher.

Which is worse, ignorance or apathy? I don't know and I don't care!

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06-16-2018 11:13 PM  6 months agoPost 4
classic

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The stator gator is simply a hall sensor, it does not control anything, just reads rpm and changes the wave output to a wave the Gov can read.

The 750 will not activate if the current rpm is higher then the set rpm.
In other words, if your target rpm is set for 2000, then while you spool up your rpm has to be LESS then that prior to your governor being activated. So if your using your throttle to activate your governor at apx 1/4 to half stick, your motor RPM HAS to be less then 2000 {or whatever your target rpm is set to} for the governor to activate. if you have a higher current rpm then then what you set the governor for prior to activating, it will not come on. The governor can only raise the RPM when turning on, it cannot bring the motor rpm down when it is first activating.

Which is worse, ignorance or apathy? I don't know and I don't care!

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06-18-2018 02:09 PM  5 months agoPost 5
ayhab

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Mississauga, ON - Canada

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Okay, so the SG now has Rx battery voltage powering it up. What voltage is it provding back to the Rx port on the signal wire? Is it a wave signal like I read in a previous reply, or is it a voltage level? If it is a voltage level, what is the range of voltage? 0-3.3v,0-Rx battery V?
I am now getting an rpm reading on the screen, but i’m guessing my settings aren’t correct because the governor is not kicking in at all. I have the cgy 750 set to nitro and 2 pole. If it is set to nitro, does the 2 pole setting make a difference as it is directed towards electric? I’ve disconnected all blades from the machine and just running it up briefly to see if the gov kicks in and it doesn’t. I don’t like revving it long as there is no load on the engine currently.

summer is here, its flying time!

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06-18-2018 02:24 PM  5 months agoPost 6
RM3

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Killeen, Texas - USA

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the GCY needs several things to happen in order for the gov to kick in. First the gov must be enabled, this can be combination of a switch setting (on/off) and a minimum throttle position.

Please watch these videos on how to setup the CGY750 step by step

Watch at YouTube

showing a preference will only get you into trouble, 90% of everything is crap...

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06-18-2018 06:46 PM  5 months agoPost 7
Carey Shurley

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Orlando, FL - USA

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"The governor can only raise the RPM when turning on, it cannot bring the motor rpm down when it is first activating."

this isn't really accurate, I have observed it doing exactly that many times.

Proprietor - Gas Powered Helicopters

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06-18-2018 06:50 PM  5 months agoPost 8
RM3

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Killeen, Texas - USA

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Carey Shurley
I have observed it doing exactly that many times.
yup... by setting a on/off switch for gov enable... or when you have the min throttle position to engage set higher than what the throttle position that gives a particular setpoint RPM.

showing a preference will only get you into trouble, 90% of everything is crap...

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06-19-2018 01:40 PM  5 months agoPost 9
Carey Shurley

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Orlando, FL - USA

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I'm not sure if we are agreeing or not

I've watched the Futaba governors engage when the engine is already running above the set RPM and then watched as it lowered the throttle until it matches the set RPM.

I set one up on a bench using a variable speed electric motor once, there is all sorts of stuff going on with the control display when its running that you can't really see when its flying.

Proprietor - Gas Powered Helicopters

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06-19-2018 01:55 PM  5 months agoPost 10
RM3

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Killeen, Texas - USA

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Carey Shurley
I've watched the Futaba governors engage when the engine is already running above the set RPM and then watched as it lowered the throttle until it matches the set RPM.
exactly...
Its possible to set the CGY up that way. simply by using an Aux switch to turn the gov on or off at any point during the programmed throttle curve in the TX provided the minimum throttle setpoint in the CGY is also satisfied.

showing a preference will only get you into trouble, 90% of everything is crap...

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06-19-2018 11:29 PM  5 months agoPost 11
classic

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Sorry, I may be mistaken here, the GV-1 Defiantly did not bring throttle down, if the 750 does, that's awesome!

Which is worse, ignorance or apathy? I don't know and I don't care!

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06-19-2018 11:30 PM  5 months agoPost 12
classic

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Ayhab, in answer to your question, its sending signal not voltage reading.

Which is worse, ignorance or apathy? I don't know and I don't care!

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