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Goblin 500 › Goblin 500 squeeck/squeel sound
03-18-2015 07:38 AM  3 years agoPost 1
cmouton

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Ceres, Western Cape, South Africa

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Good day,

My Goblin 500 started with a weird sound yesterday.

When I hover inverted and feed negative pitch to do a quick climb out, I can hear a squeak/squeal sound for a second and then it goes away.

Upright flying with a quick climb out don't make this sound.

I checked the motor belt, tail belt and it are all in good condition and tension are correct. No slipping are evident.

Motor bearings are also good. It's a Scorpion motor and I lube the bearings with Scorpion lube every 5-8 flights.

Maybe I must remove the one way bearing, clean it and put some tri flow grease in it? I did it about 50 flights ago.

Heli have done roughly 80-100 flights. Only sports flying were done.

I'm still new with inverted hovering and started to do it the past weekend.

Any thoughts on what might cause this sound?

Thanks!

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03-18-2015 12:32 PM  3 years agoPost 2
smokeeater908

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Summerville, Ga

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I had a 770 that when given a lot of collective either full or negative it would sound like birds chirping but I never was able to find anything. Checked the head replaced all bearings and belts and nothing. I really hope you find out what it is.

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03-18-2015 01:07 PM  3 years agoPost 3
cmouton

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Ceres, Western Cape, South Africa

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Thanks for the reply.

After some thought and inspecting the heli, I noticed very small metal particals on the maingear. I don't recall that I have seen this before.

Maybe my Castle gov gain are too high? It are set to 13 at the moment.

How does gear chatter sounds like?

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03-23-2015 10:29 AM  3 years agoPost 4
cmouton

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Ceres, Western Cape, South Africa

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Problem fixed! My Castle governor gain were too high!

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03-24-2015 04:52 PM  3 years agoPost 5
Jacoub

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Kuwait

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the best all day heli is 500 IMHO

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03-30-2015 02:46 AM  3 years agoPost 6
horsefeetky

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frankfort ky usa

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tt
so what did you set the gain to that made the noise go away..

fly fly rebuild 2 to 1 ratio is good right

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03-30-2015 04:25 PM  3 years agoPost 7
cmouton

rrNovice

Ceres, Western Cape, South Africa

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10% Gain. It works like a charm!

Kyle Stacy recommend 9-10% Castle gov gain for a Goblin 500.

Here are a link of the video where he mentioned the Castle Gov gain.

Watch at YouTube

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08-19-2015 05:01 PM  3 years agoPost 8
cmouton

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Ceres, Western Cape, South Africa

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The chirping sound did come back from time to time, but much less when I dropped the gov gain.

The only fix were a Kontronik 100+ lv. No weird noises anymore!

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08-19-2015 07:27 PM  3 years agoPost 9
Jim Cimino

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NE Pennsylvania

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I had a bearing failure on my Goblin 700 Comp on the drive gear assembly for the tail belt, only a few flights on it and no reason. I don't know if you could have the same thing starting, but might be worth a look.

Team Synergy, Team Scorpion, No good deed goes unpunished

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