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Futaba CGY750 FBL System Futaba CGY750 Help and features Support Forum |
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09-14-2016, 06:53 PM | #1 (permalink) |
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Join Date: Jan 2012
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Gain & setup question
I've put a CGY750 on a Trex600 nitro, set it up & test flew it with standard settings. Tail was good but on punch outs their's some right cyclic roll, not much, maybe 5-10 degrees. It's there at all head speeds, governed or not. General flight performance was ok too, just sporting around for now.
Tried to increase main gain about 10 points for aileron & elevator but that seemed to create a left cyclic change when going up to idle up during spool up that resulted in a blade strike & some carnage. Did I go the wrong way by increasing gain or have I missed something else? Swash was levelled & is linear through full travel i.e. mechanics are ok. This is my first CGY and it's running v2.0 firmware. Citizen #186 |
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09-14-2016, 08:58 PM | #2 (permalink) |
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Join Date: Apr 2004
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Increasing head gain 10 points would not create that adverse behavior if you were in the typical 50-70% working range before increasing.
Ben Minor
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Team Futaba USA, Team Minicopter/Peak Aircraft, Team Kontronik USA, Kontronik Service USA repair.usa@kontronik.com Please do NOT PM me here on HF. Last edited by Dr.Ben; 09-15-2016 at 04:28 PM.. |
09-15-2016, 10:25 AM | #3 (permalink) |
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Join Date: Dec 2012
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Mr. Squiggle,
Sorry to hear you had some damage. That is not good. I wanted to add another view point to your issues. If it is only drifts when you punch out, and also it sounds like it freaked out on spool up drift wise. To me, that sounds like vibration. While the CGY750 is very good at tolerating high frequency vibrations/glow motors/tail vibes/motor vibes (very good actually), low frequency vibes such as rotor head will still cause issues as the gyro actually ties to correct for the larger, lower frequency errors. If it was during punch out, and during spool up those are two places the model would vibrate the worst is there was a blade tracking or fluttering issue. Of course this is just my opinion or suggestion, but is there a chance the thrust bearings had gone bad? I have noted the exact same behavior in my own models when I have had the thrust bearings start to go bad. 1) tracking issues/drift in Forward/backward/high/low collective, as well as on landing and take off the model seems squirmish. The very first thing I notice is that the models start to randomly not roll as axial as it once did. But if you were still in general tuning/getting used to it phase you might not have noted any difference in rolling behavior. Nick |
09-15-2016, 06:49 PM | #5 (permalink) | |
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Thread Starter
Join Date: Jan 2012
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Quote:
Thanks for your input Nick. I've rechecked the setup & found a small right aileron roll at full pitch so that's been fixed mechanically & in the CGY. No chance to check the old setup for blade tracking but it seemed OK when I test hovered it & on tear down inspection the thrust bearings seem to be ok, so I'll check for vibration issues. I am still getting used to the CGY so no rolling tests done yet, didn't get that far! Citizen #186 |
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