SpiritGT with ThrottleJockey Revmax, weird throttle behavior

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Orjan
Posts: 11
Joined: Wed 07. Jul 2021 12:50:06

Hello gents.

I have a Raptor 90 nitro converted to FBL with the SpiritGT. It seems the Spirit governor is making the rpm change throughout the flight and not following the target rpm, but that is another topic.

To be able to fly for now I thought to use the ThrottleJockey Revmax from Modelavionics, as I have that unit in my other flybar Raptor and it works great. I have two extra units here, so wanted to give it a quick try.
The sensor on this Raptor is picked up by the Revmax unit, so it should be ok. Also Spirit governor is disabled.
- When I have the throttle servo wire directly in the Spirit unit (AUX1), the throttle servo behaves normal when powered up.
- But when I have a wire from AUX1 to the Revmax and the throttleservo is connected to the Revmax, the servo is jittering quite a lot.
In both cases the servo is following as it should when moving the throttle stick.

I don't know if it's the Revmax, but does the Spirit have any "special" servosignal? That makes the servo misbehave when connected through another device?
I am wondering what I'm doing wrong here...

Anyone have any experience with this?


Cheers guys!
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ZeXx86
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Joined: Mon 29. Apr 2013 16:06:44
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Hello,

you should set the lowest frequency for the throttle servo in the Spirit unit - General - Governor/Throttle window. Then it should work.
Spirit System developer
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Orjan
Posts: 11
Joined: Wed 07. Jul 2021 12:50:06

Hello.

Thank you for the fast response :)

I just tried your suggestion but the throttleservo is still jittering, only at a lower frequence.

But I just thought of something when browsing the menus:
In the picture is my Governor settings, although disabled for now. I hovered the cursor on the Max Head speed line, hence the explanation box. The Throttle frequency was originally at 200Hz, adjusted down to 60Hz for the test previously mentioned.
Is the RPM value set in that box ment to be the "Actual" max head speed that the helicopter can achieve with 100% throttle curve?
Or can I set it at whatever I want (within reason of course) to make it "easier" calculating the desired head speed? Like with 2000 RPM, a 90% throttle curve would give 1800 RPM.

Not sure if I have understood that correctly...

Cheers.


EDIT: Never mind, I found the manual for the governor part... :oops:
Attachments
Spirit Gov settings.jpg
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Orjan
Posts: 11
Joined: Wed 07. Jul 2021 12:50:06

However, I do use the original sensor from the ThrottleJockey Revmax.

Could it make a difference if I tried one of the recommended sensors from the manual?

Align HE50H22 RPM Sensor
Spartan SRC-RPM RPM Sensor
Spirit RPM Sensor

Or is a sensor a sensor, no matter the brand?
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ZeXx86
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Posts: 12836
Joined: Mon 29. Apr 2013 16:06:44
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Hello,

each sensor is very different and could make very big difference regarding performance.
Each is also used for different mounting. They are also designed by different manufacturers and were originally intended not to be used with other controllers.
With Spirit most sensors will work, but some can work better. For example using hall based sensor and magnets should work well.
Spirit System developer
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Orjan
Posts: 11
Joined: Wed 07. Jul 2021 12:50:06

Thank you for the answer, it clears some things up as I have no experience with sensors.

I think the Revmax is working in a totally different way with different signals as well, so I have scrapped that idea and will try the Spirit governor again. I have ordered the Spirit RPM sensor ;)

Thanks again sir!

Cheers.
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