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HomeRC & Power✈️Aircraft🚁HelicopterFlybarless Rotor Head SystemsFutaba CGY › CGY750 Governor / Limiter
10-18-2020 10:21 AM  9 days ago
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hgh001

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New Zealand

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CGY750 Governor / Limiter
Hi,

Had a CGY750 way back when they were released with version 1.1 flew other controllers and fitted entire fleet with 750’s version 2 recently.
Today I had to watch how my perfectly running YS motor got over reved until the fuel ran out. The limiter engaged at ridiculous HS and couldn’t get it to disengage.

Rev.Sens = 96%

S-curve for normal mode, 100% flat line for idle-ups. Rpm matching the radio (futaba).

Afterwards I realised that the Stick.SW parameter wasn’t set, ON 100% at closed throttle.

Could this be the cause of the over revving?

Unable to inhibit the Stick.SW parameter after setting at 30% afterwards?
Don’t want the limiter enabled in normal mode.
Didn’t want to fly other heli setup exactly the same.

Cheers,
Heinz
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10-19-2020 01:16 PM  8 days ago
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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/
/

As far as I know, futaba didn't make another governor!

Governor inside gy750 is the gv-1 with "some hidden function", not hidden now...

So, let's clarify your setup.
I can't follow you to see what happen.

/
Saludos cordiales,
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10-19-2020 02:02 PM  8 days ago
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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hgh001 S-curve for normal mode, 100% flat line for idle-ups. Rpm matching the radio (futaba).
/
/

Don't do that.

In case of governor fail or just putting "off" the governor, you are commanding the throttle to stay full rpm...

It is a good practice to draw your curves without governor.
So, your heli must fly without governor.

/
Saludos cordiales,
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10-19-2020 04:21 PM  8 days ago
dgoss999

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UK - Lancashire

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Rojoalfa It is a good practice to draw your curves without governor.
So, your heli must fly without governor.
100% agree.. The GV-1 is a governor, not 'fly by wire'.. The Machine must fly 'consistanly' on all functions first, with the GV-1 turned off!
https://www.facebook.com/scale.skids.52
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10-19-2020 04:40 PM  8 days ago
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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According to the explanation, that heli was flying with the governor engaged. Very nice!

For some reason, governor disengaged so that TX took full control but that throttle curves was a flat 100% line so no way to put your heli on idle down!!!

Of course, you have a throttle hold feature... Probably that function was not enable...

Very bad!

Too many problems on that setting.

/
Saludos cordiales,
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10-19-2020 05:15 PM  8 days ago
dgoss999

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UK - Lancashire

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Maybe something never to be overlooked is the Tx/Rx Failsafe function should ALWAYS be enabled...

In the UK, the BMFA recommend the failsafe on Helis for throttle is it should go to idle or closed on loss of signal.

If all other channels had been set to hold, turning off the Tx would probably saved this motor!

As was mention elsewhere, Throttle hold would have had a similar effect..

DG
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