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HomeRC & Power✈️Aircraft🚁HelicopterFlybarless Rotor Head SystemsBrain iKon › iKon Governor on Glow Model.
09-04-2019 03:11 PM  18 months ago
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rrElite Veteran

Meridian, Mississippi

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iKon Governor on Glow Model.
Recently I set out to add temperature logging to my iKon. The set up and installation of the temp probe was an enjoyable learning experience. It went well and I'm now able to see engine temperature real time on my TX as well as download temperature data as recorded by the iKon. It's pretty cool - but that's not why I'm writing about.

My setup is as follows:
- Align 700XN
- OS 1.05HZ-R. 30% nitro.
- OEM Align blades.
- iKon 2 HD w/BT.
- Futaba 18MZ with R7008SB receiver.
- I'm using a standard Futaba RPM sensor as you would find on a CGY 750.
- Head speeds 1,450 1,750 and 2,050 programmed.

Last weekend, in an effort to get some baseline data, I picked the helicopter up into a stable hover and just let it hover there for several minutes waiting for the temperature to stabilize. I did this for all three head speeds.

Here is a screenshot of the raw data. On the left you can see the temperature start to rise as the model is started. Shortly thereafter the head-speed and throttle output rises and stabilizes. You can see where I switch between the 3 different setups. Temperature peaks at around 240F.

All that is interesting enough but below is a sub-section of the above data. This is setup 3 and 2,050 rpm head speed. If I'm reading this data correctly, the ThrottleOut appears to be nearly pegged at 100% just holding the programmed head speed in a hover.(!) Data from previous flights showed that head speed was never very constant but I put that down to hard maneuvering and the clutch slipping. Is it possible that it takes nearly maximum engine output to hold a hover?

I will begin digging into my setup to see if I can find an obvious answer to what I'm seeing. I think I'll start by verifying the endpoints of my throttle servo. I'm nearly 100% certain the carb is opening fully but I'll double check.

Any thoughts? Anyone else logging similar data, possibly from a different model, that we could compare?
"Well, nothing bad can happen now."
09-04-2019 06:46 PM  17 months ago

rrKey Veteran

Morgan Hill, CA. USA

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The only time I've seen this was when I was too rich on the high speed needle.

The Brain / iKON gov algorithm is tuned for electric motors (instant torque) and has problems adapting to the analog problems with IC motors (too rich).

And, it could be that your throttle linkage geometry needs to be adjusted.
It can take me 30 to 40 mins to set the servo's end-points to line up with the carb barrel's endpoints and 50% mark and make sure it is linear across the whole travel.
But, in the end, when I see "80%" throttle out on the log, I know the barrel was opened 80%
+ > ÷
Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!
10-19-2019 12:57 PM  16 months ago


Saco, ME

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Deleted"Sweet dreams and flying machines in pieces on the ground." J. Taylor
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HomeRC & Power✈️Aircraft🚁HelicopterFlybarless Rotor Head SystemsBrain iKon › iKon Governor on Glow Model.

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